Free Online Developer Tools
Toolza provides free online developer tools for everyday coding tasks. Format and validate JSON, encode and decode Base64 and URL strings, generate UUIDs and hashes, test regular expressions, decode JWT tokens, minify CSS and HTML, and more — all running in your browser without sending your code to any server.
All 40 Developer Tools
What You Can Do
Common tasks you can accomplish with Toolza developer tools.
JSON Formatter
Format, validate, and minify JSON. Fix syntax errors and pretty-print JSON data.
Base64 Encoder
Encode and decode Base64 strings. Useful for data URLs, email attachments, and API tokens.
URL Encoder
Encode and decode URL strings. Handle special characters, query parameters, and form data.
UUID Generator
Generate UUID v4 identifiers for databases, APIs, and unique references.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text input.
Regex Tester
Test regular expressions with real-time matching, capture groups, and flag toggling.
JWT Decoder
Decode JWT tokens to view headers, payloads, and signatures without exposing secrets.
Diff Checker
Compare two texts side by side and highlight differences. Useful for code reviews and version comparison.
CSS Minifier
Minify CSS code to reduce file size. Remove whitespace, comments, and redundant rules.
HTML Minifier
Minify HTML markup for faster page loads. Remove unnecessary spaces and comments.
SQL Formatter
Format and beautify SQL queries with syntax highlighting and indentation.
Unix Timestamp
Convert between Unix timestamps and human-readable dates. Includes current timestamp.
Color Picker
Convert between HEX, RGB, and HSL color formats. Pick and preview colors visually.
Unit Converter
Convert between units of length, weight, temperature, data, and more.
Frequently Asked Questions
No. All developer tools run entirely in your browser. Your code, tokens, and data never leave your device.
Yes. Toolza developer tools process everything locally in your browser with no network requests. Nothing is stored or transmitted.
SHA-1, SHA-256, SHA-384, and SHA-512 using the browser Web Crypto API.
It handles standard JSON including nested objects, arrays, unicode escapes, and large files. It also validates syntax and reports errors with line numbers.