JSON Formatter
Prettify and validate JSON with syntax highlighting.
Tools
A growing collection of free, single-purpose tools for developers and everyday use. Format and validate JSON, decode JWTs, convert timestamps, merge or split PDFs, compress images, convert HEIC photos, generate QR codes, make passport photos, and more — all without leaving your browser.
- Your data never leaves your device
- Runs entirely in your browser
- No sign-up or account required
JSON to TypeScript
Generate TypeScript interfaces from a JSON sample.
JWT Decoder
Decode and inspect JWT header, payload and signature.
Timestamp Converter
Convert Unix timestamps to human-readable dates.
Base64 Encoder / Decoder
Encode or decode Base64 strings and files.
URL Encoder / Decoder
Percent-encode or decode URLs and query strings.
Merge PDF
Free PDF merger — combine PDFs in your browser, no upload required.
Split & Extract PDF
Free PDF splitter — extract pages, split into individual files or divide by ranges, all in your browser.
HEIC to JPG Converter
Convert HEIC and HEIF photos to JPEG locally in your browser.
Image Compressor
Compress JPG, PNG and WebP images directly in your browser.
Passport & Visa Photo Maker
Free passport and visa photo maker — crop to exact dimensions and generate printable photo sheets, all in your browser.
Unit Converter
Convert length, weight, temperature, area, volume, speed, time and storage.
QR Code Generator
Generate QR codes for URLs, text and more.
CSS Unit Converter
Convert px, rem, em, %, vw and vh with configurable context.