AZ Tools

Drop a CSV, see row / column counts, per-column type inference, null counts, unique counts, and full-row duplicate detection — all locally.

Drop an image and split it into its red, green, and blue channels — view each one isolated or as a grayscale intensity map.

Convert between spreadsheet column letters and numbers — A=1, Z=26, AA=27, BC=55 — and between A1 and R1C1 cell notation.

Convert any MAC address into its modified EUI-64 interface ID and the matching IPv6 link-local address — the same form Windows / Linux compute automatically.

Flip a coin one or ten thousand times — see the heads/tails ratio, the longest run, and (for small samples) the full sequence.

Quick card per HTTP method (GET, POST, PUT, DELETE, PATCH, …) — safety, idempotence, cacheability, and whether request / response bodies are allowed.

Tick the languages, frameworks, editors, and operating systems you use — get one combined `.gitignore` ready to drop into a fresh repo.

Convert your dog or cat's age into the rough "human-year equivalent" — using vet-recommended scales, not the old multiply-by-seven myth.

Drop a CSV, see row / column counts, per-column type inference, null counts, unique counts, and full-row duplicate detection — all locally.

Drop an image and split it into its red, green, and blue channels — view each one isolated or as a grayscale intensity map.

Convert between spreadsheet column letters and numbers — A=1, Z=26, AA=27, BC=55 — and between A1 and R1C1 cell notation.

Convert any MAC address into its modified EUI-64 interface ID and the matching IPv6 link-local address — the same form Windows / Linux compute automatically.

Flip a coin one or ten thousand times — see the heads/tails ratio, the longest run, and (for small samples) the full sequence.

Quick card per HTTP method (GET, POST, PUT, DELETE, PATCH, …) — safety, idempotence, cacheability, and whether request / response bodies are allowed.

Tick the languages, frameworks, editors, and operating systems you use — get one combined `.gitignore` ready to drop into a fresh repo.

Convert your dog or cat's age into the rough "human-year equivalent" — using vet-recommended scales, not the old multiply-by-seven myth.

Compute Easter Sunday for any year using the standard Gregorian computus — or the Julian (Eastern Orthodox) variant.

Drop an image and pixelate it to any block size — block-perfect output you can use to censor a screenshot or build retro art.

Split a date range into N equal intervals — get the start/end of each chunk or just the boundary dates between them.

Generate batches of random IPv4, IPv6, or MAC addresses for tests and mocks — public / private / ULA / link-local / UAA / LAA scopes supported.

Drop a file and paste an expected SHA-1 / 256 / 384 / 512 — see if the actual hash matches. Useful before installing downloaded binaries.

Pick two colors and see how perceptually different they are — CIE76 ΔE, CIEDE2000 ΔE, and plain RGB distance with a side-by-side swatch.

Convert a JavaScript object literal (`{name: 'Alice'}`) to strict JSON — or strict JSON back into a tidy JS literal with unquoted keys.

Build URLs by combining a base address with editable key-value query parameters — each pair toggleable, properly percent-encoded.

Pick a pattern (weekly, every Nth weekday of the month, on the same day of month, every N days) and see the next N actual dates.

Paste an indented list of file and folder names and get a pretty ASCII tree — the kind you'd paste into a README.

Drop an image and see its pixel dimensions, simplified aspect ratio, decimal ratio, megapixels, orientation, file size, and the closest common preset.

Pick N random dates between two boundaries — with options for unique-only, sorted, and weekdays-only.

Type plain ASCII and get 𝐁𝐨𝐥𝐝, 𝐼𝑡𝑎𝑙𝑖𝑐, 𝓢𝓬𝓻𝓲𝓹𝓽, 𝔉𝔯𝔞𝔨𝔱𝔲𝔯, 𝕯𝖔𝖚𝖇𝖑𝖊-𝖘𝖙𝖗𝖚𝖈𝖐, 𝙼𝚘𝚗𝚘, and sans-serif variants from the Unicode Math Alphanumeric blocks.

Type a 5-field cron expression and see the next N times it will fire — local time, including weekday + day-of-month dual semantics.

Drop a PDF and pull just the pages you want — `1-3, 5, 7-10` — into a fresh PDF. All in your browser, no upload.

Paste an HTML snippet and get React-ready JSX — `class` becomes `className`, `onclick` becomes `onClick`, void tags self-close, inline styles can be object-ified.

Slide a Kelvin value and watch the black-body colour shift from warm amber to neutral white to cool blue — plus a handful of common light-source presets.

Pick a coffee / tea / cola dose and see how much caffeine is still in your bloodstream now, in an hour, in six — and when it'll drop below the sleep threshold.

Type an IPv4 or IPv6 address and see its class, scope (private / public / loopback / link-local), decimal value, binary, reverse-DNS notation, and /32 CIDR.

Convert between cups, tablespoons, teaspoons, millilitres, and fluid ounces — and weigh common ingredients in grams or ounces.

Paste a `Cookie:` request header or a `Set-Cookie:` response header and see each cookie's name, value, attributes, and warnings.

Turn a JSON array of objects into INSERT statements — PostgreSQL, MySQL, SQLite, or ANSI quoting, with an optional ON CONFLICT upsert tail.

Searchable cheat sheet for ~60 standard TCP / UDP port numbers — from 22 (SSH) and 80 (HTTP) to 6379 (Redis) and 27017 (MongoDB).

Drop two or more PDFs, reorder them with the arrow buttons, and download a single merged PDF — all in your browser, no upload.

Strip HTML tags from a snippet and get just the text — keeps block-level newlines, drops `<script>` and `<style>`, decodes entities.

Fill out a form, get a ready-to-paste `<meta>` block — Open Graph for Facebook / LinkedIn / Slack and Twitter Card tags for X / Discord.

The full Tailwind CSS default palette — 22 hues × 11 shades, 50 through 950 — with click-to-copy as Tailwind class, HEX, or rgb().

Type plain text and get Unicode superscript (²) and subscript (₂) variants — paste into chat, docs, or anywhere fonts won't help you.

Drop a few files into the browser and download them as a single .zip — no upload, no install, fast compression.

Switch delimited text between CSV, TSV, pipe, and semicolon — with proper RFC-4180-style quoting and auto-detection.

Compute Body Surface Area in m² using five published formulas — Mosteller, Du Bois, Haycock, Boyd, Gehan & George — side by side.

Paste any JSON and get a draft-07 JSON Schema that matches its shape — types inferred, formats detected, required fields filled in.

Convert between straight (`"`) and typographic / curly (`“ ”`) quotes — and back — with locale-aware styles.

Generate a fully fake person — name, email, phone, address, date of birth, company — for placeholder content, mockups, or test data.

Paste an SRT or WebVTT file, type an offset in seconds, and get every cue shifted forward or backward.

Pick a quote at random from a curated collection — wisdom, motivation, humor, tech, life — and copy it with one click.

Drag hue, saturation, lightness, and alpha sliders to dial in a color — copy HEX, RGB, HSL, or a Tailwind arbitrary value.

Convert between hourly, weekly, monthly, and yearly pay — with configurable work week and paid holidays.

Searchable cheat sheet for DNS record types — A, AAAA, CNAME, MX, TXT, NS, SOA, PTR, SRV, CAA, DNSSEC, SVCB / HTTPS — with examples.

Drop a photo and download a clean copy with EXIF, GPS, and other metadata removed — all in your browser, no upload.

Paste a cURL command — get ready-to-use JS fetch or axios code with headers, body, method, and basic auth handled.

All 147 CSS / X11 named colors with HEX, RGB, and a live swatch — searchable and grouped by hue.

Type any date (ISO, RFC, Unix epoch, locale) and see it rendered in 14+ standard formats side by side.

Find the MIME type for a file extension (or the other way around) and learn what each type is for.

Drop a photo to inspect its EXIF metadata — camera, lens, exposure, GPS — all in your browser, nothing uploaded.

Searchable reference for ~50 standard HTTP request, response, CORS, caching, security, and cookie headers.

Encode and decode Base32 (RFC 4648), with standard and base32hex variants — useful for TOTP secrets and Crockford-style IDs.

Convert between JSON and XML in both directions with configurable indent. Attributes use the `@_` prefix on the JSON side.

Browse and search the 256-row ASCII / extended-ASCII table — decimal, hex, octal, binary, and the named control characters.

Build placeholder image URLs from picsum.photos — set dimensions, grayscale, blur, a seed for stable images, or a specific image ID.

Pull every link and image out of a Markdown document — inline, reference-style, autolinks — into a CSV/JSON/MD list with text, URL, and title.

Evaluate arithmetic expressions with the usual math functions — `sqrt`, `sin`, `log`, `pow`, `min/max`, and constants `pi`, `e`, `tau`.

Sort the keys of a JSON object alphabetically. Optionally recurse into nested objects so the whole document is canonicalized.

Compare two strings with Levenshtein, Damerau-Levenshtein, and Hamming distance. Plus a similarity percentage you can use as a fuzzy-match threshold.

Format a number the way each locale expects — `1,234,567.89`, `1.234.567,89`, `$1.23M`, `12 345 ₽` — and grab the matching JavaScript snippet.

Convert internationalized domains between Unicode (`münchen.de`) and Punycode ASCII (`xn--mnchen-3ya.de`).

Run JSONPath queries (`$.store.book[*].author`, `$..price`) against a sample document and see the matching values.

Pixels ↔ physical print size at any DPI. Common print presets (72 web, 150 draft, 300 photo, 600 fine art), megapixels, aspect ratio, and file size estimates.

Add tax to a net price or extract tax from a tax-inclusive price. Common VAT/GST/sales tax presets (5–25%).

Generate tints (lighter), shades (darker), and tones (with gray) from any base color — 2 to 20 stops, in HEX, RGB, or HSL.

Paste any CSS selector to see its (ID, class, type) specificity, per-token breakdown, and head-to-head comparison with another selector.

Interpolate between two colors in RGB, HSL, or CIELAB space. See a gradient strip of intermediate steps.

Sum daily start/end times into a weekly total, subtract breaks, and split regular vs overtime. Optional hourly rate computes the paycheck.

Convert latitude/longitude between decimal degrees, DMS (40°42'46"N), and DMM (40°42.7666'N). Generate Google Maps and geo: URIs.

Inspect text or a small file as offset + hex bytes + printable ASCII, like `xxd` or `hexdump -C`.

Convert a duration between human ("1h 30m"), clock (1:30:00), ISO 8601 (PT1H30M), and raw seconds/minutes/hours/days.

Build a CSS animation visually — pick a preset, tweak duration/easing/iteration, see the preview, and copy the generated keyframes.

Compute running pace, finish time, or distance from any two of them. Presets for 5K, 10K, half, and marathon.

Break a URL into protocol, host, port, path, query, and hash. Decode query parameters into a table.

Show day of year, ISO 8601 week, quarter, Julian day, Unix timestamp, leap-year status, and year progress for any date.

Estimate password strength via entropy and crack-time. Detects common passwords, sequences, and repeated characters. Nothing leaves your browser.

Find and replace across a block of text. Optional regex with global, case-insensitive, multiline, and dotAll flags. Live match count.

Break a string into characters and show each codepoint, UTF-8 bytes, HTML entity, CSS escape, and Unicode block.

Factor an integer into primes, list all divisors, and compute GCD and LCM of two numbers. Handles values up to ~10¹².

Convert text to and from international Morse code. Supports A-Z, 0-9, punctuation. Customizable letter and word separators.

Sort, dedupe, trim, shuffle, or reverse a list of lines. Natural sort for embedded numbers, case-sensitive toggle, blank-line removal.

Parse an IPv4 CIDR into network address, broadcast, netmask, wildcard, host range, and class. Shows binary breakdown and private/public status.

Solve V, I, R, P from any two known values. V=IR, P=VI, P=V²/R, P=I²R — pick which pair you have, get the other two instantly.

Convert between decimal (KB, MB, GB — SI base 1000) and binary (KiB, MiB, GiB — IEC base 1024) byte units, plus bits.

Measure your typing speed in WPM and CPM with accuracy tracking. 15/30/60/120s tests, English / Korean / Japanese word lists, personal best persists.

Parse a User-Agent string into browser, engine, OS, device, and CPU. Detects 20+ bots including GPTBot, ClaudeBot, PerplexityBot.

Decode 4/5/6-band axial resistors into ohm value with tolerance — interactive color picker, gold/silver multipliers and tolerances supported.

Validate ISBN-10 and ISBN-13 checksums and convert between the two formats. Hyphens and spaces are handled.

Estimate daily water needs from weight, activity, climate, and pregnancy/breastfeeding status — gives a target and a 4-block schedule.

Compute your weighted GPA across courses on US 4.0, US 4.3 (+ grades), or Korean 4.5 scales. Tracks total credits and quality points.

Pour-over, French press, AeroPress, espresso, cold brew — calculate coffee and water amounts from any ratio with method-specific defaults.

Validate a card number with the Luhn checksum, detect brand (Visa/MC/Amex/etc), and check expected length. Local, no network.

Validate an International Bank Account Number — checks country code, length, and the mod-97 checksum. Supports 75+ countries.

Split your daily calories into grams of protein, carbs, and fat — IIFYM-style presets for balanced, low-carb, high-protein, or keto.

Compute your 5 training zones from age and resting HR — pick max-HR formula (Tanaka / Fox / Gulati) and method (%MHR or %HRR / Karvonen).

Estimate body fat percentage from height, neck, waist (and hip for women) using the US Navy tape-measure formula.

Convert HTML to clean Markdown — headings, lists, links, tables, code blocks all preserved. Useful for migrating CMS content or scraping articles.

Normalize messy phone input into E.164 (`+15551234567`), international (`+1 555 123 4567`), national, and tel: URI formats.

Estimate your due date from LMP, conception date, or ultrasound — see current weeks and trimester.

Find every valid English word that's an anagram (or sub-anagram) of your letters — Scrabble cheats, word puzzles, crossword help.

Convert CSV to an HTML `<table>`, a Markdown table, or a JSON array of objects — auto-detects the delimiter.

Calculate the sale price after a percent or fixed discount — plus tax, savings, and effective discount rate.

Count how often each word appears in your text — with stopword filtering, minimum length, and CSV export.

Find the best bedtime or wake time aligned to 90-minute sleep cycles so you wake up between cycles, not mid-deep-sleep.

Generate a `[text](#anchor)` TOC from Markdown headings — bullet, numbered, or HTML output with GitHub/GitLab/simple slug styles.

Drag the control points to design a CSS easing curve — preview the motion live, copy the cubic-bezier() value.

Estimate your basal metabolic rate, daily calorie needs, and cut/maintain/bulk targets — Mifflin-St Jeor formula.

Mask emails, phone numbers, credit cards, and IP addresses in any text — for screenshots, blog posts, logs.

Strip all Markdown formatting and keep readable plain text — useful for previews, summaries, email, character counts.

Generate pure-CSS triangles (8 directions) using border or clip-path — copy the rule, drop it in.

Generate random tickets for 8 popular lotteries (Powerball, EuroMillions, Lotto 6/45, Loto 6, 双色球…) — uses crypto-secure RNG.

Estimate how long it takes to read or speak a text — adjustable WPM presets for slow, average, fast readers, TED, podcast.

Encrypt or decrypt text with four classic substitution ciphers — Caesar shift, ROT13, Vigenère keyword, Atbash mirror.

Drag corners independently, try elliptical radii, copy the CSS — with chat-bubble, pill, blob, and tab presets.

Build a fluid `font-size: clamp(...)` that scales smoothly between two viewport widths — copy a one-liner.

Generate 10 favicon PNG sizes (16, 32, 48, 64, 96, 128, 180, 192, 256, 512) from one source image — copy the HTML snippet.

Generate a scannable QR code that joins a WiFi network — print it for guests, no app needed.

Compute HMAC signatures with Web Crypto — sign webhook payloads, verify API requests, hex or base64 output.

Escape a string for 10 contexts at once — JavaScript, JSON, HTML entities, URL, SQL, regex, Bash (single/double quote), C string, Unicode \u escapes. Copy whichever you need.

Convert PNG/JPG to WebP (or back) with an adjustable quality slider — runs in your browser via canvas.

Bulk-generate ULIDs, NanoIDs, and CUID2 — modern UUID alternatives that are shorter, sortable, or collision-resistant.

Generate bcrypt hashes with adjustable cost factor, or verify an existing hash against a password — runs entirely in your browser.

Split a large CSV into smaller chunks by row count — repeat the header on each chunk, download all at once.

Memorable, high-entropy passphrases from a curated word list — generated with Web Crypto, never sent anywhere.

Convert between width × height and aspect ratio (16:9, 4:3, 21:9, …) — fit any ratio inside a container.

Visually compose blur, brightness, contrast, hue, sepia, invert, and more — copy the CSS filter or Tailwind arbitrary value.

Spot NBSPs, zero-width characters, bidi marks, and tabs in pasted text — then clean them out.

A click counter that survives a refresh — multi-counter, custom step, goal alert, and keyboard shortcuts.

Spell any text in the NATO / ICAO phonetic alphabet — Alpha, Bravo, Charlie — for radio, phone, and dictation.

Drop an image and the tool extracts a dominant-color palette via Canvas — copy HEX or grab the whole set.

Convert CSV / TSV rows into SQL INSERT statements with table name, dialect quoting, type inference, and multi-row mode.

Read text aloud with the browser's built-in voices — pick a voice, adjust rate, pitch, and volume.

Build a cron expression by clicking — hourly, daily, weekly, monthly, or fully custom — pairs with the Cron Explainer.

Type once and see how your text measures against 28+ platform limits — Twitter, Instagram, SEO titles, ad copy, app stores.

Distraction-free scratch pad that autosaves to your browser — no account, no upload, no ads.

See how your image looks to people with each of 8 types of color vision deficiency (CVD).

Visually pick grid-template-columns / rows, gap, and item alignment — copy the CSS straight into your project.

Spell out any number in English, Korean, or Japanese — for cheques, contracts, or just clarity.

Count words, sentences, headings, links, code blocks, and estimate reading / speaking time for any Markdown.

Strip whitespace and comments from HTML, CSS, or JavaScript — see the size saved and copy the result.

Convert any image to ASCII art with adjustable width, character set, and inversion — all in your browser.

Visually pick flex-direction, justify-content, align-items, and gap — copy the resulting CSS or Tailwind class.

Find any emoji by name, keyword, or category — click to copy, no system picker needed.

Build and sign HS256 / HS384 / HS512 JWTs from a header and payload — pairs with the JWT Decoder.

Run focused 25-minute work sessions and short / long breaks, with a circular timer, sound alerts, and a daily counter.

Searchable list of every HTTP status code (1xx-5xx) with summary, RFC, when to use, and common pitfalls.

Drop a screenshot or photo of a QR code and read what's inside — entirely in your browser, no upload.

Convert Markdown to clean HTML — copy the source for emails, CMS pages, or anywhere a rendered preview isn't enough.

Generate realistic fake records for testing — names, emails, dates, IDs, lorem — exported as JSON, CSV, or SQL INSERTs.

Pretty-print and validate YAML — fix indentation, sort keys, choose line width, catch errors in place.

Drop an image and click anywhere to grab the exact HEX / RGB / HSL of that pixel — collect a palette as you go.

View CSV / TSV data as a sortable, searchable table — open a file or paste rows, no spreadsheet required.

Add or subtract years, months, weeks, days, and business days from any date — or find the difference between two dates.

Generate TypeScript interfaces from any JSON sample — types are inferred recursively and named after each key.

Compare two JSON documents structurally — see exactly which keys were added, removed, or changed.

Combine multiple JPG / PNG images into a single PDF with adjustable page size, orientation, and fit.

Generate cryptographically random numbers in any range — with or without duplicates, optionally sorted.

See several time zones side by side with live updates and offset differences from your local time.

Calculate the monthly payment, total interest, and full amortization schedule for any fixed-rate loan.

Turn any text into a clean URL slug — strip accents, choose a separator, set a max length.

Visually design CSS box-shadows with multiple layers, live preview, and copy-ready CSS / Tailwind output.

Rasterize SVG to a PNG at any size, with transparent or solid background, all in the browser.

Paste CSV, TSV, or pipe-delimited data and get a properly aligned GitHub-flavored Markdown table.

Format and beautify SQL across 10 dialects (PostgreSQL, MySQL, BigQuery, Snowflake, T-SQL …).

Drop a ZIP and see every file inside — sizes, contents, and per-file download — without unpacking it locally.

Crop any image to a standard aspect ratio (1:1, 16:9, 4:3, etc.) — centered automatically.

Rotate an image 90° at a time or flip it horizontally / vertically, then download the result.

Split a list of names into balanced random groups — pick the group count or the people per group.

Project how a starting balance grows with regular contributions, your interest rate, and your compounding frequency.

Convert any color between HEX, RGB, HSL, HSV, OKLCH, and a CSS custom property.

Convert between px, rem, em, pt, vw, vh, and % using your own base font size and viewport.

Compare two pieces of text and see line-by-line or word-by-word additions and removals.

Translate a cron expression into plain English (or your language) and break down each field.

Convert JSON to YAML or YAML to JSON — pick the indent and copy the result.

Calculate the exact difference between two date-times, broken down into days, hours, minutes, and seconds.

Encode HTML special characters (& < > " ') or decode entities back to their original characters.

Split a large file into smaller chunks to bypass attachment or upload size limits.

Pick N winners from a list of names — cryptographically random, with or without duplicates.

Build linear or radial CSS gradients with multi-stop colors and copy the code.

Calculate exact age in years, months, days — and find your next birthday.

Resize an image to any dimensions and export as PNG, JPEG, or WebP — all in your browser.

Convert a date and time between any two world timezones, including DST.

Open text files in legacy encodings (EUC-KR, Shift_JIS, Windows-1252…) as readable UTF-8.

Test JavaScript regular expressions live with highlighted matches and replace preview.

Roll polyhedral dice (d4–d100) or flip a coin with cryptographic randomness.

Convert between bytes, KB, MB, GB, TB — in decimal (1000) or binary (1024).

Convert between Arabic numbers and Roman numerals from 1 to 3999.

Calculate Body Mass Index from height and weight, with a healthy range.

Build harmonious color palettes from a base color in six schemes.

Decode a JSON Web Token to inspect its header, claims, and expiration.

Generate random version-4 UUIDs in bulk, with copy.

Compute SHA-1, SHA-256, and SHA-512 checksums of any file.

Calculate the tip and split the total bill between people.

Convert an image to a Base64 data URL you can paste anywhere.

Convert Unix timestamps to dates and dates back to timestamps.

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text.

Work out percentages, what-percent, and percent change in one place.

Paste any list of numbers and instantly get count, mean, median, mode, standard deviation, quartiles, IQR, and more — all computed in your browser.

Paste (x, y) pairs and instantly get the best-fit line — slope, intercept, Pearson r, R², and a live prediction — all computed in your browser.

Generate live RFC 6238 TOTP codes from a Base32 secret — handy for testing 2FA flows, debugging authenticator integration, or as a temporary fallback when your phone is unreachable.

Check text/background contrast against WCAG AA and AAA levels.

Estimate your 1RM from a sub-maximal lift using six classic formulas (Epley, Brzycki, Lombardi, O'Conner, Wathan, Lander) plus a percentage projection table for programming training weights.

Parse, compare, and bump semantic versions side-by-side, with a range expander that shows what ^x.y.z and ~x.y.z actually cover.

Convert any text into bionic reading format — first letters of each word bolded as fixation points to help your eyes glide faster through long passages.

Compute the compound annual growth rate that connects a starting value to an ending value over N years — or solve for the end value or the time needed instead.

Solve for selling price, profit margin, or maximum cost — and convert between margin %, markup %, and price multiplier instantly.

Generate placeholder text by paragraphs, sentences, or words.

Automatically crop empty transparent, white, black, or any solid-color border off an image — with adjustable tolerance, padding control, and PNG/JPEG/WebP export. Everything runs in your browser.

Score any English text on six classic readability formulas — Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, SMOG, Automated Readability Index, and Coleman-Liau — with per-formula bands and a combined grade estimate.

Convert any decimal into its closest fraction (with adjustable maximum denominator, including binary fractions for inch measurements), and any fraction back into decimal / percent. Includes side-by-side common-fraction and 1/16″ inch-fraction reference tables.

Plot the classic biorhythm cycles — physical (23 days), emotional (28 days), intellectual (33 days), plus four secondary cycles — for any birth date and target date. Interactive ±15-day chart, current percentage per cycle, and critical-day list.

Drop a .har file from Chrome / Firefox / Safari DevTools and instantly see every request — method, status, size, time, content type — with stats, slowest/largest tables, and filterable / sortable entries. Runs entirely in your browser.

Generate Certificate Authority Authorization (CAA) DNS records so only the CAs you trust can issue TLS certificates for your domain. Builds BIND-format records and split tag/value rows for control-panel UIs, plus a one-click list of common CAs (Let's Encrypt, DigiCert, Google, Amazon, …).

Paste a list of participants and instantly get a properly seeded single-elimination bracket — with BYE handling for non-power-of-2 counts, three seeding modes (as entered / alphabetical / random with reseed), and copyable Markdown export. All client-side.

Visual builder for the CSS `clip-path` property — pick a shape (circle, ellipse, inset, or polygon), tweak the numbers with sliders or click the preview to add polygon points, and copy a ready-to-paste CSS declaration. 10 shape presets included (triangle, hexagon, star, arrow, message bubble, plus, …).

Sharpen any photo or screenshot in your browser using the unsharp-mask algorithm — three sliders (amount, radius, threshold), four presets (subtle → extreme), live before/after comparison, and PNG download. Nothing is uploaded.

Count every character in your text — letters, digits, whitespace, punctuation — and compare against expected English frequencies for cryptanalysis.

Convert shoe sizes between US, UK, EU, and Mondopoint (cm) for men's and women's footwear with the full chart visible.

Generate printable mazes with adjustable size, cell scale, and reproducible seed — recursive-backtracking algorithm with optional solution overlay.

How old are you on Mercury, Mars, Saturn or Pluto? Enter your birth date and see your age plus next-birthday countdown for every planet in the Solar System.

Drop a .wav file and read its format, channels, sample rate, bit depth, duration, all RIFF chunks, and embedded LIST/INFO tags — fully client-side.

Stack as many text-shadow layers as you want — neon glow, 3D lift, outline, long shadow — live preview plus copy-ready CSS.

Fake a miniature-diorama look on any photo — sharp focus band plus blurred top and bottom, with optional saturation boost, all in the browser.

Write a template with {{placeholders}}, paste rows of data (CSV or JSON), and render one personalised text per row — entirely in your browser.

Convert text between UPPER, lower, Title, camelCase, snake_case and more.

Compare how the modern CSS color-mix() function blends two colors in different interpolation spaces (srgb, hsl, oklch, lab, lch, hwb, oklab, srgb-linear) — live swatches, computed hex, full gradient strip per space, and copyable CSS for each.

Convert CSV to JSON and JSON back to CSV, with a delimiter option.

Convert numbers between binary, octal, decimal, and hexadecimal.

Coalesce a messy list of IPv4/IPv6 addresses, CIDR blocks, and ranges into the smallest equivalent set of CIDR prefixes.

Generate a full round-robin pairing schedule where every participant meets every other participant exactly once — using the classic circle method.

Percent-encode text for URLs, or decode encoded URLs back to text.

Generate Docker-style memorable nicknames (`elegant-archimedes`, `funny-curie`) — pick a style, separator, count. Useful for test data, anonymous handles, container/branch names.

Convert XML to JSON and back, with full attribute support, configurable attribute prefix and text key. Browser-native DOMParser handles namespaces, CDATA, comments.

Visual builder for CSS `conic-gradient()` — rotate angle, center position, color stops, shape preview. Useful for pie charts, ring charts, checkered patterns, color wheels.

Apply a two-color duotone effect to any image — pick a shadow color and a highlight color, adjust midpoint and contrast, download the result. Spotify-style covers in two clicks.

Searchable catalog of well-known URIs registered with IANA — `security.txt`, `openid-configuration`, `apple-app-site-association`, `acme-challenge`, and 30+ more, with RFC references and use cases.

Build a valid `manifest.json` for a Progressive Web App — name, icons, theme color, display mode, scope, orientation — with the matching HTML `<link>` and Apple meta tags.

Convert between solar (Gregorian) and East Asian lunisolar calendar dates. Returns zodiac animal and ganzhi (heavenly-stem/earthly-branch) year name. Covers 1900-2099.

Upload any text file and detect its encoding — UTF-8, UTF-16 LE/BE, UTF-32, Latin-1, ASCII — with BOM detection, byte signal analysis, and a hex preview.

Generate an RFC 6902 JSON Patch from a source/target pair, or apply an existing patch to a document. Supports add, remove, replace, move, copy, test ops.

Look up the day of the week for any date — supports multiple dates at once, multilingual day names, ISO week numbers, day-of-year, and leap-year flag.

Generate cryptographically secure random bytes in 9 output formats — hex, Base64, Base64URL, binary, decimal, C array, Python bytes, UUID v4.

Convert Unix file permissions between octal (755), symbolic (rwxr-xr-x), and checkbox grid. Includes setuid/setgid/sticky, chmod & find commands, and umask hint.

Find the closest CSS, Tailwind, or XKCD-survey color name for any hex/RGB input — ranked by perceptual distance in OKLab color space.

Parse a .env / dotenv file with full support for single-quoted, double-quoted, multi-line, and inline-comment values. Export as JSON, YAML, shell exports, Dockerfile ENV, or Netlify TOML.

Generate code_verifier + S256/plain code_challenge for OAuth 2.0 PKCE (RFC 7636). Also builds the authorization URL and a ready-to-paste curl for the token exchange.

Apply Gaussian, box, or motion blur to any image directly in your browser. Adjustable radius 0-64 px, with the equivalent CSS filter string for copy-paste.

Pick random emojis from 10 categories — smileys, people, animals, food, activities, travel, objects, symbols, nature, weather. Pick 1-200 with configurable separators.

Convert between latitude/longitude and geohash strings (Niemeyer 2008). Adjustable precision 1-12, with bounding box and 8 neighbor cells.

Compare grocery and shopping items by price-per-unit (price per gram, mL, or piece). Mass, volume, and count groups with imperial and metric units.

Convert a timestamp between seconds, milliseconds, microseconds, and nanoseconds since Unix epoch. Auto-detects precision, also outputs ISO, RFC 2822, and relative time.

Add solid or transparent padding and an optional border around any image. Fit to a target aspect ratio (1:1, 4:5, 16:9…) for Instagram, YouTube, or print — all in your browser.

Generate a downloadable .ics calendar event with title, start/end, location, attendees, recurrence (daily/weekly/monthly/yearly) and a reminder — fully RFC 5545 compliant, generated in your browser.

Estimate download time from file size and connection speed — or the speed required to transfer a given size within a deadline. Includes TCP/overhead and presets for common connections.

Generate samples from uniform, normal, exponential, Poisson, Bernoulli, or triangular distributions — with histogram, summary stats, and CSV/JSON export. Powered by crypto.getRandomValues.

Generate a Material You / Material Design 3 tonal palette (tones 0–100) from any source color, plus contrast against black/white and CSS/Tailwind/JSON/SCSS export.

Browse ISO 216 A/B/C, US (Letter/Legal/Tabloid/ANSI), Japanese JIS-B, photo and envelope paper sizes — see millimeters, inches and pixel dimensions at any DPI, plus side-by-side size comparison.

Convert any UTC moment to Greenwich and Local Mean/Apparent Sidereal Time, Julian Date, Modified Julian Date and Earth rotation angle — for telescope alignment, astronomical observation and astro-software.

Drop a .gpx file from your GPS watch, Strava, Garmin, Wahoo, Komoot or any GPS tracker and instantly see distance, elevation gain/loss, duration, moving time, average and max speed, plus an in-browser track map and elevation profile.

Build or parse a DKIM (DomainKeys Identified Mail) DNS TXT record — paste your public key, pick selector, key type (RSA/Ed25519), hash and flags, get the full record plus the selector._domainkey hostname and a DNS-chunked version for records over 255 chars.

Convert any image to a 1-bit dithered image using Floyd-Steinberg, Atkinson, Sierra Lite, or ordered Bayer 2/4/8 patterns — for retro Mac/Game Boy looks, e-ink displays, halftone print, or pixel art.

Convert a light wavelength in nanometres (380–780 nm — the visible spectrum) to an approximate sRGB color, with a clickable rainbow gradient bar and reference Fraunhofer absorption lines from real solar spectroscopy.

Generate fresh creative prompts for drawing, writing, photography, coding side-projects, or fictional world-building. Hit reroll for a new batch of structured, evocative prompts to break creative blocks.

Convert between decibels and linear ratios for either voltage/SPL (20·log) or power (10·log), sum multiple dB SPL sources logarithmically, and look up reference levels (dBV, dBu, dBm, dBFS, dB SPL, dBW, dBi) and common everyday loudness values.

Convert a musical tempo (BPM) to note durations in milliseconds — straight, dotted and triplet — for whole, half, quarter, 8th, 16th, 32nd, 64th notes. Includes tap-tempo and common delay presets for echo/reverb pre-delay setup.

Drop a .stl file (binary or ASCII) and instantly see triangle count, bounding box, X×Y×Z size, volume, surface area, watertight check, three orthographic preview projections, and whether it fits common 3D-printer beds (Bambu, Prusa, Voron, Ender).

Paste or load a sitemap.xml (or a sitemap-index .xml) and instantly see URL count, size, spec compliance, and distributions of changefreq, priority and host — entirely in your browser.

Convert between RGB / hex screen colors and CMYK percentages for print, with simple, GCR (Gray Component Replacement) and UCR (Under Color Removal) black-generation strategies, channel separation preview, and a total ink coverage readout.

Convert any image to a classic halftone pattern using variable-sized dots, squares, diamonds or lines on a rotated grid — the technique offset litho and newspaper presses have used since the 1880s to render continuous tone with a single ink.

Random key, scale, chord, tempo, time signature and technique focus for instrument practice — 12 chromatic roots, 15 scales (modes, pentatonic, blues, diminished, phrygian dominant), 14 chord qualities up to 9ths, and 20 articulation prompts.

Convert between American Wire Gauge (AWG), wire diameter (mm and inch), cross-section area (mm² and kcmil), British Standard Wire Gauge (SWG), resistance per km/1000ft for copper and aluminum, and NEC ampacity tables for chassis wiring and power transmission.

Pick any date and get the lunar phase name, illumination percentage, age in days since the last new moon, an SVG illustration of the current crescent / gibbous shape, and the dates of the next new moon and full moon — over a customisable look-ahead window.

Paste or upload a GeoJSON file and get a structural validation against RFC 7946, per-geometry counts, WGS-84 spherical-excess area for polygons, haversine length for linestrings, bounding box, and an SVG map preview — all in your browser with no upload.

Paste any IANA cipher suite name like TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 and get a breakdown into key exchange, authentication, bulk cipher, mode, and MAC — plus a security grade covering forward secrecy, AEAD, hash strength, and known-broken algorithms.

Draw a random chess opening for study from 24 classical and modern openings, filtered by category (Open, Semi-Open, Closed, Flank), difficulty, and which side you'll play. Includes ECO codes, the first key moves, and a direct study link.

Compare seven different brightness metrics — HSL Lightness, HSV Value, WCAG Relative Luminance / LRV, CIE Lab L* perceived lightness, Rec. 709 Luma, HSP Perceived Brightness, and naïve (R+G+B)/3 — for one or two colors side by side, with deltas to show why a 'lighter' color can actually feel darker.

Detect edges in any image using classic 3×3 gradient operators — Sobel, Scharr, or Prewitt — with adjustable pre-blur to control noise, threshold to choose how strong an edge has to be, and custom foreground / background colors for blueprint, sketch, or neon-style outputs.

Two-way converter between running pace (min/km, min/mile) and speed (km/h, mph, m/s, knots) with race time projections for 100 m, 400 m, mile, 5K, 10K, half marathon, and marathon at the chosen pace.

Compute the Equation of Time (the gap between mean solar time and apparent solar time) for any date, plus the longitude correction to your civil time zone, the actual local solar noon, and the 'sundial reads X minutes ahead or behind the clock' for sundial calibration.

Drop or paste any vCard 2.1, 3.0, or 4.0 .vcf export and read all the contacts as cards — names, phone numbers, emails, addresses, organizations, URLs, birthdays, notes, embedded photos, and any custom X- fields, all parsed locally in your browser.

Build a mailto: URL with To, Cc, Bcc, subject, and body — RFC 6068 percent-encoded, ready to drop into an <a> tag.

Randomly pair Secret Santa givers with recipients, with optional exclusion pairs (e.g. spouses, siblings) and hidden reveal cards so the host can run the draw without seeing anyone's match.

Apply all 16 W3C compositing blend modes (multiply, screen, overlay, soft-light, hue, color, luminosity…) to two colors and see the computed hex result for each, with a copyable mix-blend-mode CSS snippet per mode.

Add a soft radial vignette to any photo — adjustable amount, softness, radius, oval / circle / rectangle shape, dark or light, any color. 100% in your browser, no upload.

Convert any angle between degrees, radians, gradians, turns, milliradians, arcminutes, arcseconds, and DMS — with live SVG preview and π-fraction recognition.

Convert a single moment in time between 11 historical epoch formats: Unix seconds and ms, NTP, Windows FILETIME, .NET DateTime Ticks, Mac HFS+, Apple Cocoa CFAbsoluteTime, Excel 1900 and 1904 serial, ISO 8601, and RFC 2822.

Drop any bencoded file (.torrent or raw bencode) and inspect its tree, info hash (SHA-1), trackers, file list, piece length, and creation metadata — all parsed locally in your browser.

Encode text to Base64 or decode Base64 back to text, instantly.

Paste a robots.txt and a list of (user-agent, path) pairs to see exactly which line allows or blocks each — with longest-match precedence, wildcards, and the * group fallback.

Convert any date to its ISO week number (and back) — get the Monday-start / Sunday-end of that week, ISO year, day-of-year, and how many weeks the year has.

Pick names or options with custom weights — like a non-uniform raffle. See each option's true probability and draw with or without replacement.

Compute the sha256 / sha384 / sha512 base64 hash an inline <script> or <style> block needs to be whitelisted by a Content-Security-Policy.

Toggle owner / group / other read-write-execute bits to see the matching octal (755), symbolic (rwxr-xr-x), and ready-to-run chmod and find commands.

Reduce a photo to N levels per channel for that flat poster-art look, with optional Floyd-Steinberg dithering and per-channel level control.

Compose a Strict-Transport-Security header — max-age, includeSubDomains, preload — with a live preload-list eligibility check.

For any date, get the calendar quarter, fiscal quarter (with a configurable fiscal-year start), days into / left in the quarter, and the quarter's start/end dates.

Pick colours in the perceptually uniform OKLCH space (lightness · chroma · hue) — and see whether each pick fits inside the sRGB display gamut.

Compose a Sender Policy Framework TXT record from mechanisms, IPs and includes — with a live DNS-lookup counter and warnings.

Generates printable 3×3, 4×4 or classic 5×5 BINGO cards — number mode or your own word list, free-center optional, browser-print friendly.

Drop files and preview a batch rename — pattern with {n}, {name}, {ext}, {date}, plus find/replace, case modes, and collision detection.

Pick a base color, get classic color-wheel harmonies — complementary, split-complementary, triadic, tetradic, square, analogous, monochromatic.

Drop several images and bake them into a single PNG sprite — horizontal, vertical or grid — plus ready-to-paste CSS background-position rules.

Add timezones with each participant's working hours, see the 24-hour overlap grid, and read the best meeting slot in everyone's local time.

Compose a `_dmarc` TXT record — policy, subdomain policy, percentage rollout, alignment, rua/ruf reporting — with safety warnings.

Paste CSV/TSV, click the columns you want, get them back as plain lines, CSV, quoted-comma-separated, or a ready-made SQL IN-clause.

Type your options, spin a colored wheel, get a winner — with optional remove-after-winning for raffles and history of the last 20 picks.

Compose a `Set-Cookie` response header from name/value plus the security attributes — SameSite, Secure, HttpOnly, Partitioned, Max-Age — with safety warnings.

Drop an `.eml` file and read the parsed message — key headers, plain-text and HTML body parts, and a list of attachments — all in the browser.

Add N working hours to a start datetime — skip weekends and holidays, respect a per-day work window, get the landing timestamp and a per-day breakdown.

Type a yes/no question, shake the ball, get one of 20 classic answers — or swap in your own pool. Pure randomness, no judgement.

Combine multiple images into one — horizontal strip or vertical stack — with alignment, gap, background color and optional uniform scaling.

Pick two hex colors, get N discrete intermediate steps — in sRGB, linear RGB, OKLab or HSL — with optional easing.

Strip `utm_*`, `fbclid`, `gclid` and 30+ other tracking params from a URL — paste, get a clean shareable link back.

Convert subtitle files between SRT (SubRip) and WebVTT — auto-detects the input format, fixes timestamp punctuation, optionally strips VTT styling tags.

Type a birthdate, get a live ticking countdown to the next birthday — plus exact age, days since born, hours lived, and the rare golden birthday year.

Play classic Rock-Paper-Scissors against a fair random opponent — keep score, track win/loss streaks, optional best-of-3/5/10 match mode.

Encode `username:password` into the Base64 `Authorization: Basic` header — or paste an existing header back to see who's in it.

Paste or drop a `.jsonl` / `.ndjson` file, see records as a table, filter by `field:value`, pick which columns to keep, and re-export as JSON or CSV.

Paste a list of `YYYY-MM-DD` dates (with optional counts) and render a GitHub-style yearly heatmap — palette, week start, streaks, hover counts.

Build the `Permissions-Policy` response header — toggle camera, microphone, geolocation, payment, fullscreen and 20+ other browser features by origin allowlist.

Click the panel, wait for it to turn green, click again — get your reaction time in milliseconds. Tracks average, best, worst across the session.

Paste or drop a Markdown file, extract the YAML / TOML / JSON frontmatter into a JSON object, and see the body separately with word and char counts.

Convert between a Gregorian date and a Julian Day (JD), Julian Day Number (JDN), Modified Julian Day (MJD), Reduced/Truncated JD, and Unix timestamp.

Pick a Referrer-Policy value and see exactly what `Referer` header outbound requests will send — same-origin, cross-origin HTTPS, HTTPS→HTTP downgrade.

Apply rounded corners, a full circle mask, or per-corner radii to an image — preview with a checkerboard for transparency, download as PNG or JPEG.

Convert between TOML (`Cargo.toml`, `pyproject.toml`, Hugo configs) and JSON — handles tables, array-of-tables, inline tables, typed scalars.

Split a long SPF, DKIM or DMARC TXT record into the 255-byte chunks the DNS protocol requires — outputs BIND, generic zone file, Cloudflare or Route 53 syntax.

Drop a `.png` file and see every chunk it contains — IHDR, IDAT, tEXt metadata, IEND — with sizes, CRCs, and the critical/ancillary/safe-to-copy flags.

Paste a list, get it back in random order — line-, comma- or whitespace-separated input, optional seed for reproducible runs, numbered or plain output.

Expand a CIDR block (10.0.0.0/24) into a list of IPs, or convert a start-end range into the smallest covering CIDR set. Shows network, broadcast, mask, wildcard, usable count — all in the browser.

Format any past or future date as `2 hours ago`, `in 3 days`, `last month` — in 12 locales, three styles (long/short/narrow), with `numeric: auto` for the natural-language phrasing.

Define a color palette once, export to CSS custom properties, Tailwind config, SCSS, LESS, design-token JSON, SwiftUI Color, or Android `colors.xml`. Live preview swatches.

A precise stopwatch with laps and a countdown timer with an alarm.

Toggle any IPv6 address between its shorthand ::1 form and the fully-expanded 8-group representation, with reverse DNS and binary too.

Count the business days between two dates — pick which weekdays count as weekend and paste a list of holidays to exclude.

Round-trip between INI-style config files and JSON — supports sections, dotted nesting, comments, and value type inference.

Paste a raw email header to walk the Received hops in order, see the per-hop delay, and read off the SPF/DKIM/DMARC verdicts.

Convert between LF, CRLF, and CR line endings and add or remove a UTF-8 BOM — with per-style counts so you can see how mixed the input was.

Drop an image to see its RGB and luminance distribution, with per-channel mean, median, and clip-point stats.

Build an HTTP Cache-Control header from a visual checklist — freshness, revalidation, immutability, and the common presets.

Draw N cards from a properly shuffled 52-card deck (optional jokers), with deck-tracking so you don't draw the same card twice.

Paste a list of hex colors and sort them by hue, saturation, lightness, or perceived brightness — useful for tidying a design-token palette.

Build a CSP header from per-directive source lists, with three starter presets and live warnings for the dangerous wildcards.

Compute sunrise, sunset, solar noon, and all three twilight phases for any latitude, longitude, and date — using the NOAA solar algorithm.

Drop a file to identify its true format from its magic bytes — and catch files whose extension or declared MIME type lies.

Compose Access-Control-* response headers from a checklist, with four presets and live warnings for the dangerous combinations.