Free Developer Tools Online
13 free tools · no registration · works in your browser
Free online developer tools for encoding, formatting, validation, and code utilities. JSON formatter, Base64 encoder, regex tester, hash generator, and more.
Base64 Encoder / Decoder
Encode and decode text or files to/from Base64, with file upload and download support. All processing runs in your browser.
HEX to RGB Converter
Convert HEX color codes to RGB and RGBA values instantly. Enter any 3 or 6-digit hex code and get the CSS-ready output.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Supports seconds and milliseconds with local and UTC timezone display.
CSS Box Shadow
Create CSS box shadow effects visually. Adjust blur, spread, offset, color, and inset. Live preview and ready-to-copy CSS.
HTML Encoder / Decoder
Encode special characters to HTML entities and decode them back. Covers &, <, >, ", and all named entities.
URL Encoder / Decoder
Encode and decode URLs using RFC 3986 (%20 for spaces) or RFC 1738 (+ for spaces). Supports full URL or component encoding.
JSON Formatter
Format, validate, and minify JSON data directly in your browser. Includes collapsible tree view with syntax highlighting.
Regex Tester
Test regular expressions with real-time match highlighting, capture group display, replace output, and multi-flag support.
Hash Generator
Generate MD5, SHA-1, SHA-224, SHA-256, SHA-384, and SHA-512 cryptographic hashes of any string using the Web Crypto API.
JWT Decoder
Decode and inspect JWT tokens — view header algorithm, payload claims, and issued/expiry dates without needing the secret key.
UUID Generator
Generate multiple random UUID v4 identifiers in bulk directly in your browser. Copy individually or all at once.
XML Formatter
Format and beautify XML with configurable 2/4/tab indentation, text-node trimming, and XML declaration toggle.
SQL Formatter
Format SQL queries with consistent indentation and keyword casing. Supports MySQL, PostgreSQL, SQL Server, Oracle, SQLite, BigQuery and Spark SQL.