Dev Tools - Free Online Developer Utilities
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Case Converter
Free case converter: switch any text between lowercase, UPPERCASE, camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE in one click.
Color Converter
Convert a color between HEX, RGB and HSL, build a scale of shades, and check the contrast ratio against white, black or any second color.
Cron Parser
Paste a cron line and read what it actually means, plus the next times it will fire. Handles ranges, steps, names and the day-of-month rule people get wrong.
JWT Decoder
Free JWT decoder: paste a token to read its header, payload and signature in a readable form - decoding happens in your browser, nothing is sent.
Lorem Ipsum Generator
Free Lorem Ipsum generator: create placeholder text by paragraph, sentence or word count, with optional HTML tags for your design mockups.
Binary / Hex / Decimal
Convert between binary, octal, decimal and hexadecimal instantly. Handles numbers far beyond 64 bits, shows bit length and the matching Unicode character.
Password Generator
Generate passwords in your browser using your device's cryptographic random source, and see real strength in bits of entropy, not a coloured bar.
QR Code Generator
Turn any text or link into a QR code and download it as PNG or SVG. Error correction, size, margin and colours are yours to set; nothing is uploaded.
Regex Tester
Write a regular expression and see the matches, the capture groups and the replacement instantly. A runaway pattern is stopped instead of freezing the tab.
Text Diff
Compare two texts and see exactly what changed. Line or word level, side by side or inline, with neither text ever leaving your browser.
Unix Timestamp Converter
Free Unix timestamp converter: turn epoch seconds into a readable date and back, with time zone support and one-click copy for both directions.
URL Encoder & Decoder
Free URL encoder and decoder: convert links and query parameters to percent-encoding and back, with full-URL and component modes, in your browser.
UUID Generator
Free UUID generator: create v1, v4 and v5 identifiers instantly, generate them in bulk and copy any value with a single click - no signup needed.
Hash Generators
MD5 Hash Generator
Free MD5 hash generator: turn any text or file into an MD5 checksum in your browser - useful for integrity checks and quick fingerprinting.
SHA1 Generator
Free SHA-1 hash generator: turn any text into a SHA-1 digest instantly, with uppercase or lowercase output and one-click copy - no upload needed.
SHA256 Generator
Free SHA-256 hash generator: turn any text into a SHA-256 digest instantly, with uppercase or lowercase output and one-click copy - no upload.
SHA512 Generator
Free SHA-512 hash generator: turn any text into a SHA-512 digest instantly, with uppercase or lowercase output and one-click copy - no upload.
Base64 Tools
Base64 Encoder & Decoder
Free Base64 encoder and decoder: convert text or files to Base64 and back, entirely in your browser - nothing is uploaded to a server.
JPG to Base64
Convert a JPG photo to Base64 and copy a data URI, the raw string or a CSS snippet - it also tells you when inlining is a bad idea.
PDF to Base64
Convert a PDF to Base64 for APIs that expect documents as text: get the raw string, a data URI and an embed snippet, all in your browser.
PNG to Base64
Convert a PNG to Base64 and copy a ready-made data URI, the raw string or a CSS snippet - the image never leaves your browser.
WebP to Base64
Convert a WebP image to Base64 and copy a data URI, the raw string or a CSS snippet - it also explains the fallback you give up.
CSS Minifier
Compress CSS by stripping comments and whitespace, or expand it back with clean indentation. Keeps calc() spacing, strings and license comments intact.
HTML Formatter
Indent messy HTML so you can read it, or strip it down so it ships smaller. Works on fragments too, and never rewrites your markup into something else.
JavaScript Minifier
Shrink JavaScript with Terser, the engine build tools use. It parses your code instead of guessing at it, so behaviour survives. Nothing is uploaded.
JSON Formatter
Format, minify and validate JSON in your browser. Broken input is pinpointed by line and column, and a collapsible tree shows the structure.
SQL Formatter
Break a long query onto readable lines, or squeeze it back onto one. Keeps your keyword casing, your quoted names and your strings exactly as written.
XML Formatter
Indent messy XML so you can read it, or strip it down so it ships smaller. Handles RSS, CDATA and namespaces, and never rewrites your document.
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SEO Tools