Free Online Developer Tools
7 powerful tools that run entirely in your browser. Your data never leaves your device.
Private by Design
All processing happens in your browser — zero server calls for your data.
Instant & Fast
No loading spinners. Tools open instantly and process data in milliseconds.
Always Free
No plans, no limits, no ads. Every tool is permanently free for everyone.
JSON Formatter & Validator
Format, validate, and minify JSON data with syntax highlighting and real-time error detection.
Base64 Encoder/Decoder
Encode and decode Base64 strings and files instantly. Supports text, binary data, and image preview.
URL Encoder/Decoder
Encode and decode URLs and query parameters. Supports component mode and full URL parsing.
JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, signature, and expiration status.
API Tester
Send HTTP requests from your browser. Test CORS-enabled APIs with GET, POST, PUT, DELETE methods.
HTTP Headers Reference
Browse and search 50+ HTTP headers with full descriptions, usage examples, and RFC specification links.
My IP Address
Instantly detect your public IP address with geolocation — country, city, ISP, and timezone details.
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