AZ Tools

Convert fuel economy between US MPG, Imperial MPG, litres per 100 km and kilometres per litre. Enter a value in any unit and see all the others instantly.

Translate English text into Pig Latin instantly. Consonant clusters move to the end with 'ay', vowel-initial words get 'way', and capitalization and punctuation are preserved.

Compute a^b mod m exactly for arbitrarily large integers using fast binary exponentiation, plus the modular multiplicative inverse of the base. Ideal for RSA, Diffie-Hellman and number-theory work.

Calculate or verify the GS1 modulo-10 check digit for EAN-13, UPC-A and EAN-8 barcodes. Enter the data digits to get the check digit, or a full code to confirm it is valid.

Generate the first N Fibonacci numbers — 0, 1, 1, 2, 3, 5, 8 … — with exact big-integer precision, and see the last term, the running sum and the golden-ratio approximation of the final two terms.

Add, subtract, multiply, and divide fractions, mixed numbers, and decimals. Get the reduced fraction, mixed number, decimal, and worked steps.

Scale bread recipes by baker's percentage — enter your flour weight and each ingredient as a percentage of flour to get exact gram weights, total dough weight and hydration.

Turn long words into numeronyms — keep the first and last letter and replace the middle with the count of omitted letters, like internationalization → i18n or accessibility → a11y.

Format, beautify, minify, and validate JSON right in your browser.

Count characters, words, sentences, lines, and bytes in real time.

Compress and resize JPEG, PNG, and WebP images in your browser.

Create custom QR codes from any text or URL and download them.

Generate strong, random passwords that never leave your browser.

Count the days between two dates, or the countdown to a target date.

Convert length, weight, temperature, area, volume, speed, and time.

Pick a winner with a spinning wheel or a ladder (ghost-leg) draw.

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

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

Convert a Base64 string to hexadecimal bytes and hex back to Base64, with URL-safe support, in your browser.

Encode text to MIME Quoted-Printable (RFC 2045) or decode it back — handling =XX escapes, soft line breaks, and UTF-8 — entirely in your browser, with 76-character line wrapping on encode.

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

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

See the exact IEEE 754 bit layout of any number in float32 and float64 — sign, exponent, and mantissa bits, hex, the stored value, and rounding — or decode hex bits back to a number, all in your browser.

Enter a decimal, hex, binary, or octal value and see its 8/16/32/64-bit two's complement bit pattern, plus its signed and unsigned readings, hex, octal, and one's complement — in your browser.

Convert between decimal, binary and reflected-binary Gray code, both directions, with an optional fixed bit width and a 0-7 reference table.

Convert decimal to and from 8421 binary-coded decimal — per-digit 4-bit nibbles, packed BCD hex bytes, and BCD validity checking.

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

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

Generate placeholder text by paragraphs, sentences, or words.

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

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

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

Compute the CRC-32 (IEEE 802.3, used by zip/gzip/PNG) or CRC-32C (Castagnoli) checksum of text or hex bytes, shown in lowercase hex, uppercase hex, and unsigned decimal — in your browser.

Convert Unix timestamps to dates and dates back to timestamps.

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

Calculate the tip and split the total bill between people.

Work out how many floor or wall tiles you need for a room — from its length and width and the tile size, with an adjustable waste allowance and boxes required.

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

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

Paste any UUID to see its version (1–8), variant, and — for time-based v1, v6, and v7 — the embedded creation timestamp, clock sequence, and node/MAC, all decoded in your browser.

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

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

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

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

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

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

Test a CSS selector against your HTML and see exactly which elements it matches, in your browser.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Convert a GitHub-flavored Markdown table into CSV, TSV or semicolon-separated rows, in your browser.

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

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

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

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

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

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

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

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

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

Turn a JSON object into JSDoc @typedef blocks with @property tags, in your browser.

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

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

Transpose CSV data so rows become columns and columns become rows, in your browser.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Generate the American Soundex code for names or words — a 4-character phonetic key that groups similar-sounding spellings together. Encodes one name per line in your browser.

Turn long words into numeronyms — keep the first and last letter and replace the middle with the count of omitted letters, like internationalization → i18n or accessibility → a11y.

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

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

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

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

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

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

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

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

Decode a ULID into its 48-bit creation timestamp and 80-bit randomness — Crockford Base32, case-insensitive, with the time as ISO UTC, relative, and epoch milliseconds — entirely in your browser.

Decode a Discord, Twitter/X, or Instagram Snowflake ID into its creation timestamp, worker/process or datacenter, and sequence — with a custom-epoch mode — entirely in your browser.

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

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.

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

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

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

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

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

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

Encode or decode text with the Rail Fence transposition cipher — write the message in a zigzag across a chosen number of rails and read it off row by row. Runs in your browser.

Translate text into leetspeak and decode 1337 back to letters, in your browser.

Translate English text into Pig Latin instantly. Consonant clusters move to the end with 'ay', vowel-initial words get 'way', and capitalization and punctuation are preserved.

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

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

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

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

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

Pull every email address or URL out of a block of text, in your browser.

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

Calculate the dew point and absolute humidity from temperature and relative humidity using the Magnus formula, with a comfort rating in °C or °F.

Calculate the wind chill — how cold the air feels — from temperature and wind speed, in metric or imperial, in your browser.

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

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

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

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

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

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

Extract HTML <table> data into CSV, TSV or semicolon-separated rows, in your browser.

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

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

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

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

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

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

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

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

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

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

Scale bread recipes by baker's percentage — enter your flour weight and each ingredient as a percentage of flour to get exact gram weights, total dough weight and hydration.

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.

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

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

Calculate or verify the GS1 modulo-10 check digit for EAN-13, UPC-A and EAN-8 barcodes. Enter the data digits to get the check digit, or a full code to confirm it is valid.

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

Decode 3-digit ceramic capacitor codes (104, 473K, 4R7) into picofarads, nanofarads and microfarads, with the tolerance-letter lookup.

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

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

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

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.

Compute the output voltage of a two-resistor divider, or find the R2 you need for a target output, plus current and power dissipation.

Find capacitive reactance (Xc), inductive reactance (XL), or the LC resonant frequency, with pF–F, nH–H and Hz–GHz unit pickers.

Size the current-limiting resistor for an LED (or a series string) from supply voltage, forward voltage and current — with the nearest E24 value and power rating.

Convert between mass, moles, volume and molar concentration of a solution — solve for molarity, the mass to weigh out, or the volume to make up.

Calculate the molar mass and percent composition of any chemical formula, with parentheses and hydrates, in your browser.

Apply C₁V₁ = C₂V₂ to find any unknown — the stock volume to take, the final volume, or either concentration — plus the amount of solvent to add.

Convert between pH, pOH, [H⁺] and [OH⁻] at 25 °C — enter any one and get the other three, plus an acidic / neutral / basic verdict.

Solve PV = nRT for pressure, volume, moles or temperature, with Pa/kPa/bar/atm/mmHg/psi, mL/L/m³, mol/mmol and K/°C/°F units.

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

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

Compare two lists line by line: find common items, items unique to each, union or symmetric difference — in your browser.

Pad whitespace, comma or tab separated rows into neatly aligned columns, in your browser.

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

Translate text to Unicode Braille (Grade 1) and decode Braille back to text, with capital and number signs, in your browser.

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

Generate the Collatz sequence for any positive integer — halve when even, triple-plus-one when odd — and see the number of steps, the peak value reached and the full path to 1.

Generate the first N Fibonacci numbers — 0, 1, 1, 2, 3, 5, 8 … — with exact big-integer precision, and see the last term, the running sum and the golden-ratio approximation of the final two terms.

Compute nCr and nPr, with and without repetition, plus factorials — exact arbitrary-precision integers for probability, lottery odds and combinatorics.

Compute a^b mod m exactly for arbitrarily large integers using fast binary exponentiation, plus the modular multiplicative inverse of the base. Ideal for RSA, Diffie-Hellman and number-theory work.

Estimate what any appliance costs to run — enter its wattage, hours per day and your rate per kWh to get daily, weekly, monthly and yearly energy and cost.

Solve a right triangle from any two sides — get the third side, both acute angles, area and perimeter using the Pythagorean theorem.

Convert any number to scientific, engineering and E-notation, with significant-figure rounding, an expanded decimal and the order of magnitude.

AND, OR, XOR, NOT and bit shifts on two integers — shown in binary, hex, unsigned and signed decimal, with selectable 8, 16, 32 or 64-bit width.

Join wrapped lines back into clean, flowing text — strip the hard line breaks you get when copying from PDFs or emails, while keeping real paragraphs.

Hard-wrap text to a fixed line width, breaking at word boundaries, in your browser.

Wrap each line with a prefix and suffix and join them with any separator, in your browser.

Convert text to 8-bit binary and back. UTF-8 encoded, so emoji and accented characters work, with a choice of byte separator.

Convert text to hexadecimal bytes and decode hex back to text, with UTF-8 support, in your browser.

Generate a grid of random colors in HEX, RGB or HSL — pick how many, copy any value with one click, and regenerate instantly for design inspiration.

Convert an IPv4 address between dotted-decimal, 32-bit integer, hex and binary — and see whether it's private, public, loopback and more.

Add and subtract time durations in hours, minutes and seconds — get the total as h:m:s plus decimal hours, total minutes and total seconds.

From two points, get the slope, the line equation y = mx + b, the distance, midpoint, angle of inclination, and rise/run.

Encode text to \uXXXX, U+XXXX or HTML entities — and decode any of those back to text. Handles emoji and astral characters.

Solve a proportion a/b = c/d — enter any three values, leave one field empty, and the fourth is found by cross-multiplication.

Reverse text four ways — by characters, word order, the letters inside each word, or line order. Works with emoji and any language.

Enter any one of radius, diameter, circumference or area, and instantly get the other three — with the formulas shown.

Reformat a MAC address between colon, hyphen, Cisco dot and no-separator notation, in upper or lower case — and see its unicast/multicast and universal/local type.

Estimate the fuel cost of a trip from the distance, your vehicle's fuel economy and the fuel price — in metric (L/100km) or US (mpg), with an optional round trip.

Convert fuel economy between US MPG, Imperial MPG, litres per 100 km and kilometres per litre. Enter a value in any unit and see all the others instantly.

Estimate ideal body weight from height and sex using the Devine, Robinson, Miller and Hamwi formulas — plus the healthy weight range for a normal BMI.

Convert a frequency between Hz, kHz, MHz and GHz and its period (s, ms, µs, ns) — with angular frequency (rad/s) and RPM.

Convert a musical note to its frequency in hertz, or find the nearest note and cents detune for any frequency — with adjustable A4 reference and MIDI number.

Calculate the frequency an observer hears when a source or observer moves — set the emitted frequency, wave speed and each speed and direction to get the shifted frequency and wavelength.

Repeat a word, line or block of text any number of times — joined by a new line, space, comma, nothing, or your own separator.

Convert pressure between pascals, kilopascals, megapascals, bar, psi, atmospheres and mmHg (Torr) — all at once.

Generate a deterministic, namespace-based UUID (version 5, SHA-1) from a namespace and a name — the same inputs always produce the same UUID.

Turn a JSON object into a typed Go struct with json tags, instantly in your browser.

Turn a JSON object into Python @dataclass definitions with type hints, in your browser.

Turn a JSON object into Rust structs with serde derives and type-mapped fields, in your browser.

Turn a JSON object into Kotlin data classes with typed properties, in your browser.

Turn a JSON object into C# classes with auto-property type mapping, in your browser.

Turn a JSON object into Java POJO classes with type-mapped fields, in your browser.

Turn a JSON object into a Zod validation schema with inferred types, in your browser.

Turn a JSON object into GraphQL type definitions (SDL) with scalar mapping, in your browser.

Turn a JSON object into a Mongoose schema with type-mapped paths, in your browser.

Test file paths against a glob pattern (*, **, ?, [...], {a,b}) in your browser.

Build a Conventional Commits message with type, scope, breaking change, and footers, in your browser.

Convert a CSS declaration block into a React/JS inline style object, in your browser.

Turn a JSON object into a proto3 .proto schema with typed fields and nested messages, in your browser.

Solve ax² + bx + c = 0 with the quadratic formula — real or complex roots, plus discriminant, vertex, axis of symmetry and sum/product of roots.

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

Normalize text to NFC, NFD, NFKC, or NFKD, optionally strip diacritics (café → cafe), and compare codepoint and byte counts across all four forms — in your browser.

Repair text mangled by a wrong-encoding round-trip — turn café, don’t, and 😀 back into café, don't, and 😀 — automatically, safely, and entirely in your browser.

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

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

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

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

Decode a data: URI to see its MIME type, encoding, size and decoded contents, in your browser.

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

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

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

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

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

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

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

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

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

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

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.

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

Resolve an RFC 6901 JSON Pointer like /user/roles/0 against a JSON document, with ~0/~1 escaping and URI-fragment (#/…) support — plus a clickable list of every pointer in the document, in your browser.

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

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.

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

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

Flatten nested JSON into single-level dot-notation keys, or rebuild nested JSON from flat keys — with configurable delimiter and array notation, fully reversible in your browser.

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

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.

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

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

Encode and decode Base58 with the Bitcoin, Ripple, or Flickr alphabet — from UTF-8 text or raw hex bytes, with correct leading-zero handling, entirely in your browser.

Encode and decode Ascii85 (Base85) from UTF-8 text or hex bytes — Adobe/PDF variant with <~ ~> delimiters and the z zero-group shortcut, or the plain variant — entirely in your browser.

Encode text to Base45 and decode Base45 back to text, following RFC 9285, in your browser.

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.

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.

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.

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 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.

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.

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.

Split fixed-width / fixed-column text into fields by column widths and export as CSV or JSON, in your browser.

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

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.

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.

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.

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.

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.

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.

Flip your text upside down with rotated Unicode characters, in your browser.

Convert text to fullwidth ﾑﾑﾗ for that vaporwave aesthetic look, and back again, in your browser.

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

Convert a URL query string to a JSON object and back, in your browser.

Expand RFC 6570 URI templates with your own variables — supports all four levels: path, query, fragment, label, and path-style operators with explode and prefix modifiers, entirely in your browser.

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 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.

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.

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

Build an .editorconfig file with indent style, line endings, charset and common overrides, in your browser.

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.

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.

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.

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.

Convert leading indentation between tabs and spaces with a configurable tab width, in your browser.

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.

Generate uniformly-distributed random points on Earth, optionally restricted to a bounding box — with an OpenStreetMap link for each.

Drop an image, stamp a text watermark — choose corner, size, opacity, rotation, colour, drop-shadow, or full-image tiling.

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.

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.