Browse all free developer utilities. Everything runs in your browser.
Format, validate, and minify JSON data with syntax highlighting and error detection.
Decode and inspect JSON Web Tokens. View header, payload, and expiration info.
Generate cryptographically secure UUID v4 values. Single or bulk generation.
Encode text to Base64 or decode Base64 back to plain text. Supports UTF-8.
Format and beautify SQL queries with configurable indentation and keyword casing.
Encode URL components safely or decode percent-encoded text in your browser.
Validate and indent XML documents locally, with helpful errors for malformed markup.
Make compact HTML easier to read with consistent indentation.
Remove unnecessary CSS whitespace and comments while checking basic syntax.
Test JavaScript regular expressions against sample text and inspect matches.
Preview common Markdown headings, lists, emphasis, and code without sending text anywhere.
Convert an array of JSON objects into properly escaped CSV data.
Convert Unix seconds, milliseconds, or date strings into readable UTC and local dates.
Generate SHA-1, SHA-256, SHA-384, or SHA-512 digests locally with Web Crypto.
Compare two text blocks and review added, removed, and unchanged lines.