About ConvertProKit

Free browser-based tools, built around one rule: your files never leave your device.

In one sentence: ConvertProKit (Convert Pro Kit) is a collection of 60+ free online tools - image and PDF converters, calculators, text and developer utilities - that run entirely inside your browser, with no uploads, no signup and no watermarks.

What makes ConvertProKit different

Most online converters upload your files to a server, convert them in the cloud and send the result back. ConvertProKit works the other way around: the conversion code is delivered to your browser and runs on your own device. That design has three consequences:

Privacy by architecture. Your images, PDFs and documents are never transmitted anywhere. Every tool page shows a live network monitor confirming 0 bytes of your files were uploaded.
No limits. Because there are no server costs per conversion, there is nothing to cap or charge for - no file size limits, no daily quotas, no premium tier.
Speed on slow connections. Nothing is uploaded or downloaded except the page itself, so a large file converts as fast as your device allows.

Who runs ConvertProKit

ConvertProKit is built and maintained by FireNext, an independent developer. The site is funded by unobtrusive advertising rather than subscriptions, which is how every tool stays free. Analytics and ads load only after you accept the consent banner - see the Privacy Policy for details.

How the tools work

Each tool uses standard web technology (JavaScript, canvas, Web APIs) that modern browsers support on desktop and mobile. When you pick a file, it is read into your browser's memory, processed there, and the result is saved straight back to your device. Closing the tab discards everything. The tools also keep working offline after your first visit, and the site can be installed as an app.

Start exploring

Popular starting points: HEIC to JPG, Compress Image, Merge PDF, QR Code Generator, Word Counter and BMI Calculator - or browse all 60+ tools.