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ToolMono is a blazing-fast developer utility platform. Format JSON, encode Base64, generate UUIDs, test regexes — all offline, all instant, zero tracking.
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Featured Tools
The most popular utilities in one place
Case Converter
Instantly convert text to lowercase, UPPERCASE, camelCase, snake_case, PascalCase, Title Case, and 7 more naming formats online.
Text Diff
Compare two text blocks side-by-side and highlight the differences.
JSON Formatter
Prettify, format, validate, and minify JSON data instantly. Get a clean tree view, print arrays, and check syntaxes.
Regex Tester
Build and test regular expressions with real-time match highlighting.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512, and bcrypt hashes.
JWT Decoder
Decode and inspect JWT tokens. View header, payload, and verify structure.
UUID Generator
Generate v1, v4, and v7 UUIDs in bulk with format options.
Base64 Encode / Decode
Encode strings to Base64 or decode Base64 back to plain text.
Color Converter
Convert between HEX, RGB, HSL, OKLCH, and CSS named colors.
Popular Tools
The most frequently used utilities by developers
Text Diff
Compare two text blocks side-by-side and highlight the differences.
JSON Formatter
Prettify, format, validate, and minify JSON data instantly. Get a clean tree view, print arrays, and check syntaxes.
Regex Tester
Build and test regular expressions with real-time match highlighting.