JSON formatter & validator
Format, beautify, validate, and minify JSON online. Pinpoint syntax errors by line and column, sort keys, and copy or download the result.
Format and beautify HTML, CSS, and JavaScript. Re-indent minified code with spaces or tabs and optional line wrapping.
Format and beautify HTML, CSS, and JavaScript. Minified or messy code is re-indented into readable, consistent structure using js-beautify.
<style> and <script> blocks are formatted tooHTML formatter is a free online tool on ReallyUseful.Tools. No account is required.
HTML formatter is designed to run in your browser where supported, so files can stay on your device instead of being uploaded to a server.
Format, beautify, validate, and minify JSON online. Pinpoint syntax errors by line and column, sort keys, and copy or download the result.
Encode text to Base64 or decode Base64 back to text with full UTF-8 support and an optional URL-safe alphabet.
Convert Unix epoch timestamps to human-readable dates and back. Supports seconds and milliseconds, local time, UTC, and ISO 8601.
Generate MD5, SHA-1, SHA-256, SHA-512, SHA3, and CRC32 hashes for text or files. Verify checksums and create HMACs locally.
Test JavaScript regular expressions with live match highlighting, capture groups, flags, and replace preview.