Free Online Developer Tools
Privacy-first developer utilities. Everything runs in your browser — nothing is uploaded to any server.
All Tools
JSON Formatter & Validator
Format, validate, and minify JSON with syntax highlighting and error detection.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
Base64 Encode / Decode
Encode and decode Base64 data with support for URL-safe variant.
UUID Generator
Generate random UUIDs (v4) in bulk with copy-to-clipboard support.
MD5 / SHA Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes.
URL Encoder / Decoder
Encode and decode URL parameters with proper character handling.
Privacy First
All data processing happens locally in your browser. Nothing is uploaded.
Fast & Lightweight
No server round-trips. Instant results with zero waiting.
100% Free
All tools are completely free to use. No sign-up required.