A growing collection of fast, free developer tools that run entirely in your browser. No sign-up, no uploads, no ads getting in the way. Each tool does one job well and processes everything locally on your device, so you can paste tokens, payloads, and other sensitive data with confidence that nothing leaves your machine.
Tools built for developers who value their time
Every tool here was built around the same principles. They are fast, loading instantly and working as you type with no waiting. They are private, doing all their work in your browser so that sensitive data like authentication tokens and API payloads never touches a server. And they are focused, each one solving a single common problem cleanly rather than burying it under clutter.
The tools also work well together. A JSON Web Token is made of Base64URL-encoded parts whose payload is JSON containing Unix timestamp claims, and values traveling in a URL often need percent-encoding. In other words, debugging one thing frequently leads to the next, so the collection is designed as a connected toolkit rather than five unrelated pages.
Why client-side tools matter
Many online utilities quietly send whatever you paste to a remote server for processing. For ordinary text that may not matter, but for an authentication token, a private API response, or anything containing personal data, it means handing that information to a third party. Every tool on this page avoids that entirely by running the logic in your own browser. You can verify this by disconnecting from the internet after the page loads; the tools keep working, because there is nothing to send. That design is both safer for you and faster, since there is no network round trip between typing and seeing the result.
Frequently asked questions
Are these developer tools free to use?
Yes, every tool is completely free with no sign-up, no account, and no usage limits. Paste your input and get your result immediately.
Is my data safe?
Yes. Every tool runs entirely in your browser and processes data locally on your device. Nothing you paste is uploaded, logged, or stored anywhere, which makes these tools safe even for sensitive tokens and payloads.
Do I need to install anything?
No. The tools run directly in any modern web browser on desktop or mobile, with nothing to download or install.
Will more tools be added?
Yes, the collection is growing. Each new tool follows the same fast, private, single-purpose approach as the ones here.
