Developer

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

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.

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.

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.

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.

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

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

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

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.

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.

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

Turn a JWK or a whole JWKS into PEM public keys and back, with the RFC 7638 thumbprint for each — computed in your browser.

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

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

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

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

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

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.

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.

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.

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

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.

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.

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

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

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

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`).

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.

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.

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.

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.

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

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

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

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.

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

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.

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

Beautify XML with clean indentation or minify it to one line, in your browser.

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.

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.

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

Paste any DER structure — PEM, base64 or hex — and see its ASN.1 tree: offsets, tags, lengths and decoded values.

Decode CBOR (RFC 8949) from hex or base64 into readable diagnostic notation — integers, byte and text strings, arrays, maps, tags, floats, simple values, and indefinite-length items — entirely in your browser.

Paste base64 or hex MessagePack bytes and read the values — types, nested maps, binary blobs and timestamps — decoded in your browser.

Paste base64 or hex protobuf bytes and read the fields — numbers, wire types, nested messages, strings and packed arrays — without a schema.

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.

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.