About Zase
Zase is the home of Developer Toolkit by Zase, a growing collection of everyday developer tools: JSON and YAML formatters, a JWT decoder and signer, a regex tester, hash and password generators, a QR code generator, color converters, and many more. Every tool is free, and every tool runs entirely in your browser.
Why these tools exist
Developers paste code, tokens, and data into random online tools every day, and most of those sites send whatever you paste to a server. Zase tools never do that. The formatting, decoding, hashing, and generating all happen locally on your device, in this tab, so sensitive input never travels anywhere.
Two ways to use them
On this website: nothing to install, just open a tool and work. In the Chrome extension: the same tools, fully offline, in a standalone window or docked in the side panel, with favorites, recents, and a quick search across all of them.
Privacy by design
No accounts, no analytics, no tracking, and no servers collecting your input. The full details are on the privacy page.
Open source
The toolkit is open source, written in plain HTML, CSS, and JavaScript with no build step and no dependencies at runtime. You can read every line, report issues, or suggest a new tool on GitHub.
Who builds it
Zase is built and maintained by Hamza Shabbir, a software engineer who got tired of pasting JSON into websites he did not trust, and decided to make the tools he wanted to use himself.