Developer
Format and validate JSON, encode and decode Base64 and URLs, test regular expressions, decode JWTs and generate UUIDs. Everything runs in your browser.
Format and test 9
JSON Formatter and Validator
Format, validate and minify JSON, with exact line and column errors.Regex Tester
Test JavaScript regular expressions with live highlighting and groups.SQL Formatter
Make SQL readable: one clause per line, for 13 SQL dialects.HTML Formatter
Tidy or minify HTML, including the CSS and JavaScript inside it.CSS Formatter
Format CSS, SCSS or Less, or minify CSS safely.JavaScript Formatter
Beautify JavaScript or TypeScript, or minify JavaScript with Terser.XML Formatter
Format, minify and validate XML, with clear errors.JSON Diff
Compare two JSON documents and list every change by path.Cron Expression Parser
Explain a cron expression and list when it runs next.
Convert data 8
CSV to JSON Converter
Convert CSV to JSON and JSON to CSV, quotes and separators handled.Unix Timestamp Converter
Convert Unix timestamps to dates and dates to timestamps.Color Converter
Convert HEX, RGB, HSL, HSV and OKLCH colors, with contrast checks.YAML to JSON Converter
Convert YAML to JSON and back, with errors by line and big numbers kept.XML to JSON Converter
Convert XML to JSON and JSON to XML, attributes and all.Markdown to HTML Converter
Convert Markdown to HTML with a live, safe preview.HTML to Markdown Converter
Convert HTML into clean Markdown, without scripts or styles.Number Base Converter
Binary, octal, decimal, hex and any base up to 36, for numbers of any size.
Encode and decode 8
Base64 Encoder and Decoder
Encode text or files to Base64 and decode it back, including URL-safe Base64.URL Encoder and Decoder
Percent-encode text for URLs and decode encoded URLs.JWT Decoder
Read a JSON Web Token’s header, claims and expiry.HTML Entity Encoder and Decoder
Escape text for HTML, or decode entities back into characters.URL Parser
Split a URL into its parts and decode every query parameter.Unicode Converter
Text to code points and escapes, and escapes back to text.Binary Translator
Translate text to binary code and binary back to text.Text to Hex Converter
Convert text to hex bytes and hex back to text.
Generate and look up 5
UUID Generator
Generate v4 and v7 UUIDs, ULIDs and NanoIDs, up to 1,000 at once.Random String Generator
Secure random strings and bytes for tokens, keys and test data.CSS Gradient Generator
Design linear, radial and conic gradients and copy the CSS.ASCII Table and Converter
All 128 ASCII codes, and text to ASCII codes and back.MIME Type Lookup
Find the MIME type for an extension, or extensions for a type.
Also useful
From other categories.
Image Color Picker
Pick exact colors from an image as HEX, RGB and HSL.Color Palette Extractor
Find an image’s main colors and copy them as a palette.Favicon Generator
Make favicon.ico, Apple and Android icons and a manifest from one image.Image to Base64 Converter
Encode an image as a Base64 data URL, or decode Base64 to an image.Text Diff
Compare two texts side by side with changed words highlighted.Slug Generator
Turn titles into clean URL slugs, one per line.File Type Checker
Find out what a file really is, whatever its name says.CSV Viewer
Open large CSV files as a table you can search, sort and filter.JSON Viewer
Explore JSON as a collapsible tree, with search and paths.Random Number Generator
Secure random numbers in any range, with or without repeats.User-Agent Parser
Read a user-agent string: browser, system and device.HTTP Header Checker
A page’s response headers, with its security headers explained.File Hash Calculator
Get SHA-256, SHA-1, MD5 and other checksums of files of any size.Password Generator
Strong random passwords from your browser’s secure random generator.Hash Generator
MD5, SHA-1, SHA-256 and SHA-512 hashes of text, with a checker.HMAC Generator
Sign and verify messages with HMAC-SHA256 and friends.Certificate Decoder
Read an SSL/TLS certificate, chain or CSR in plain words.