About PureKit
September 27, 2026
What is PureKit?
PureKit is a collection of 34 free online tools that run entirely in your browser: file tools (PDF merge & split, image compression and conversion), text and developer utilities (JSON/YAML/SQL formatters, Base64, JWT decoder, regex tester), calculators, converters, and generators.
Why everything runs locally
Most online tools upload your files to a server, process them, and send them back. PureKit takes the opposite approach: the same processing happens inside your browser using modern web technology. Your files are faster to process, work offline after the first visit, and — most importantly — never leave your device. That makes the tools safe for documents you would not hand to a stranger.
How it is funded
The site is free, has no accounts, and adds no watermarks. It is funded by the ads you see alongside the tools. We deliberately keep the tool areas ad-free so the work surface stays clean.
The project
PureKit is built and maintained by an independent developer. It is available in English and Chinese, works on desktop and mobile, and can be installed as an offline-capable app (PWA).