Developer Tools
Format JSON, decode JWTs, test regular expressions, generate UUIDs and hash text or files — all offline-capable, right in your browser.
JSON Formatter
Format, validate and minify JSON with precise error messages showing the exact line and column of any problem.
Base64
Encode text or files to Base64 and decode Base64 back to text or a downloadable file.
URL Encoder
Encode or decode URL components and inspect any URL's parts — protocol, host, path and every query parameter in a table.
JWT Decoder
Decode a JSON Web Token to see its header and payload, check expiry dates in plain language and optionally verify an HS256 signature — all locally..
UUID Generator
Generate cryptographically random UUID v4 or time-ordered v7 identifiers, one or hundreds at a time, with copy-all.
Hash Generator
Compute SHA-256, SHA-512, SHA-1 and MD5 hashes of text or verify a downloaded file's checksum.
Regex Tester
Test regular expressions against sample text with live match highlighting, capture group inspection and replacement preview.
Timestamp Converter
Convert Unix timestamps (seconds or milliseconds, auto-detected) to human-readable dates in local time and UTC, and back.
CSV ↔ JSON
Convert CSV to JSON and JSON to CSV with automatic delimiter detection and header handling.
Color Converter
Convert any color between HEX, RGB, HSL, HSV and CMYK with a live preview and one-click copy for every format.
YAML ↔ JSON
Convert YAML to JSON and JSON to YAML with clear error messages for invalid input.
XML Formatter
Pretty-print messy XML with proper indentation, validate it with a clear error message, or minify it to one line.
Markdown Editor
Write Markdown with an instant side-by-side preview, then copy the rendered HTML or download your document as .md or .html.
SQL Formatter
Format messy SQL into readable, consistently indented queries with support for MySQL, PostgreSQL, SQLite, BigQuery and more dialects.
Cron Explainer
Paste any cron expression to see what it means in plain English and exactly when the next five runs will happen.
UA Parser
Decode any user-agent string into browser, version, operating system, device and engine — or inspect your own browser's UA with one click..
HTML to Markdown
Paste HTML and get clean Markdown back — headings, lists, links, tables, code blocks and images all convert properly.
Meta Tag Generator
Fill in your page's title, description, URL and image to get complete copy-paste meta tags with Open Graph and Twitter cards — plus a live Google result preview..
CSS Minifier
Minify CSS to shrink file size or beautify compressed CSS back into readable, indented rules — with the size saving shown.
JSON to TypeScript
Paste JSON and get TypeScript interfaces generated automatically, with nested objects and arrays typed properly.