Encoder and Decoder
StringFlux
CyberChef
JSON Sage
DevBox
JSON Editor Online
JSONLint
Cryptii
WebToolKit.tech
Convert Case
JSON Formatter & Validator
DevToys
Base64Encode.dev
CipherKit.app
A.Tools
T00lz
ToolKit is a collection of free online utilities built for developers, designers, and everyday users. Every tool runs entirely in the browser using Web APIs โ nothing is sent to a server. The toolkit includes a cryptographically secure password generator (with 20+ specialized variants for WiFi, banking, SSH, and more), a word counter with keyword density analysis, a JSON formatter and validator, a regex tester with live match highlighting, a QR code generator with PNG/SVG export, a color converter (HEX/RGB/HSL/CMYK), Base64 encoder/decoder, UUID v4 generator, hash generator (SHA-256/512), URL encoder, case converter, lorem ipsum generator, markdown editor with live preview, color palette generator, and a username generator. Built with Next.js and TypeScript, deployed on Vercel. New tools added regularly.
Encoder and Decoder
WebToolKit.techStringFlux - Transform, format and convert strings between different formats with this free online tool.
Convert Case - Instantly convert text to UPPERCASE, lowercase, Title Case, sentence case, and more - free, fast, and no sign-up required.
CyberChef - The Cyber Swiss Army Knife
JSON Formatter & Validator - The JSON Formatter was created to help with debugging.
JSON Sage - Development
DevToys - A collection of converters, formaters, encoders, generators and other tools for your Windows desktop.