Free Online Developer Tools

Essential utilities for developers. Fast, secure, and privacy-focused. All processing happens in your browser—your data never leaves your device.

Featured Tools

Convert between JSON, YAML, and TOML formats instantly. Free online converter with automatic format detection and validation.

Decode and inspect JSON Web Tokens (JWT) instantly. View header, payload, and signature without verification. Free online JWT decoder.

Visualize and understand cron expressions. See next run times, get human-readable descriptions, and validate cron syntax.

Test and debug regular expressions online. Interactive regex tester with syntax highlighting, match visualization, and capture groups.

Generate random UUID v4 identifiers instantly. Bulk generate UUIDs with options for uppercase and hyphen-free formats.

Generate SHA-256, SHA-384, and SHA-512 hashes instantly. Secure hash calculator for text and data verification.

All tools run entirely in your browser. No data is sent to servers.

No server round-trips. Instant results with minimal JavaScript.

Clean interfaces, keyboard shortcuts, and helpful error messages.