Developer Utility Tools
Free, fast, and privacy-focused tools for developers. All processing happens in your browser - your data never leaves your device.
Available Tools
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to text. Supports Unicode characters.
JSON Formatter/Validator
Format, validate, and minify JSON with syntax highlighting and error detection.
JWT Decoder/Encoder
Decode, verify, and create JSON Web Tokens with HS256 signature support.
UUID/GUID Generator
Generate UUID v4, UUID v7, or ULID unique identifiers with customizable formats.
Cron Expression Parser
Parse, validate, and build cron expressions with human-readable explanations and next run times.
Regex Tester
Test regular expressions with real-time matching, capture group highlighting, and common patterns library.
Unix Time Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds, milliseconds, and multiple timezones.
JSON to YAML Converter
Convert between JSON and YAML formats with syntax highlighting and validation.