Free Online Tools for Developers

Two reasons. First, privacy — Toolkiya processes everything in your browser, so a JWT pasted into the decoder never reaches a server. Most popular alternatives put your inputs through their backend. Second, no friction — no signup, no rate limit, no upsell modal, and large payloads are handled without choking, because there's no upload step at all.

Yes. The tools use the same JavaScript primitives your application code runs: native JSON.parse, the browser's RegExp engine, Web Crypto for hashing, atob/btoa for Base64. So what you see in the tester is exactly what your code will see at runtime. No proprietary regex flavor, no rounded-off Unix timestamps, no quietly stripped JSON fields.

Most do. Once a page has loaded, the JSON formatter, regex tester, diff checker, JWT decoder, Base64, hash generator, color converter, and timestamp converter all run without an internet connection. Tools that need data (IP lookup, currency converter, country info) need a connection. The whole site is also installable as a PWA for offline access.

Permalink sharing for stateful tools like regex-tester, json-formatter, and diff-checker is on the roadmap — the plan is to URL-encode the state in the hash so it never touches a server. For now, the simplest way to share is to copy your inputs into a chat or PR description.

Some of them have HTTP API endpoints — see the API Documentation page. The core utilities (formatters, validators, encoders) are designed to be importable as small JavaScript libraries, but the public versions live at the URLs above. If there's a specific tool you want as a CLI, send a note to hello@toolkiya.com and it'll be considered.

Yes. The browser-native tools (no server costs to run them) will stay free with no rate limit and no signup. The site is ad-supported, not freemium. There is no paid plan being held back from this page.