Free Developer Tools
Daily-driver utilities for developers: format and validate JSON, decode JWTs, test regex patterns, generate strong passwords, and encode URLs — fast, ad-light, no telemetry.
Format, validate, minify, and inspect JSON with helpful error messages.
Look up your public IP and any IPv4/IPv6 address — see country, city, ISP, and ASN.
Encode and decode text or files to/from Base64 — fast, private, runs entirely in your browser.
Decode JSON Web Tokens to inspect header, payload, and expiration — locally, no signature verification needed.
Generate UUID v4 or UUID v7 identifiers in batches — copy individually or all at once.
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes from any text — instantly, entirely in your browser.
Encode and decode URL components and inspect protocol, host, path, and query parameters.
About our dev tools
Free developer tools: JSON formatter, password generator, URL encoder, JWT decoder, regex tester.
Every tool in the Developer Tools collection is engineered for speed and accuracy. We use battle-tested formulas, follow accessibility best practices (WCAG 2.2 AA), and pre-render every page to static HTML so results appear the moment you open the page — even on slow mobile connections.
Privacy is the foundation of Dev. Inputs you type, files you select, and outputs you generate stay on your device. There is no upload step, no telemetry beyond anonymized page views, and no third-party tracking on tool calculation logic. That's why teachers, students, marketers, developers and everyday users return to WebGenAI thousands of times per month.
If you have a tool you'd like us to add to the dev collection, let us know. We ship new tools every week based on what real users request.