httptools.dev
HTTP Toolkit
RequestHeaders.com
HTTP Debugger
Live HTTP Headers
URL Encoder and Decoder
Fiddler
Requestly
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.
httptools.dev
WebToolKit.techNo features have been listed yet.
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
Convert Case - Instantly convert text to UPPERCASE, lowercase, Title Case, sentence case, and more - free, fast, and no sign-up required.
RequestHeaders.com - HTTP Header Checker Tools
JSON Formatter & Validator - The JSON Formatter was created to help with debugging.
HTTP Debugger - Debug HTTP API calls to a back-end and between back-ends. Easy of use, clean UI, and short ramp-up time. Not a proxy, no network issues!
DevToys - A collection of converters, formaters, encoders, generators and other tools for your Windows desktop.