Developer tools that stay on your device
Format JSON, turn it into code, convert data and images, and make app icons. Free, fast and private.
No login No uploads Free
All tools
JSON Formatter and Validator
Format, minify and validate JSON with clear error messages.
JSON Compare
See what was added, removed or changed between two JSON documents.
Image Converter
Convert up to 15 images at once between JPG, PNG, WebP, AVIF, HEIC, GIF, TIFF, ICO and more.
JWT Decoder and Verifier
Decode, verify and create JSON Web Tokens without sending them anywhere.
Image Resizer
Resize images to an exact size, by percent or for social media, and keep files under a size limit.
Image Cropper
Crop images with a free or fixed shape, rotate and flip them, or cut a circle.
Background Remover
Remove an image background on your own device and download a transparent PNG.
API Client
Send HTTP requests and read responses, with collections, environments and Postman import.
JSON to Code
Turn JSON into model classes for Kotlin, Java, TypeScript, Dart, Swift, C#, Python, Go, Rust, PHP and Ruby.
Data Converter
Convert between JSON, YAML, XML and CSV, in either direction.
XML Formatter and Validator
Format, minify and validate XML, keeping comments, CDATA and attributes as written.
YAML Validator and Formatter
Check YAML for mistakes and format it, with errors shown by line.
App Icon Generator
Create every Android and iOS app icon size from one image, ready for your project.