I built 38 free browser-only tools that never upload your files

Every time I needed to "compress an image online" or "merge a PDF", I ended up on some site that makes you upload your file to their server. For a random meme, fine. For a contract, an ID scan, or anything private? No thanks.

So I built QuickKit — a growing kit of 38 free tools that run 100% in your browser. Your files and text never leave your device. No signup, no watermarks, no tracking of what you process.

How it works (the fun part)

The whole thing is a static site — no backend, no database, no server cost. Everything happens client-side with browser APIs:

• Image compressor / resizer → the Canvas API (canvas.toBlob(type, quality))
• Image → PDF / Merge PDF → jsPDF and pdf-lib, entirely in-page
• Password / UUID generators → the Web Crypto API (crypto.getRandomValues) for real cryptographic randomness
• QR codes → generated locally, no redirect or tracking baked in
• Hash generator (SHA-256/1/512) → the SubtleCrypto API
• Countdown timer & "days since" counters → shareable via the URL itself (state encoded in query params), so there's still no backend

Because nothing is uploaded, the tools are faster and more private than upload-based services — and they even work offline once loaded (it's an installable PWA).

A few of the tools

Files & docs: image compressor, image resizer, image→PDF, merge PDF.
Dev utilities: JSON formatter, Base64, hash generator, UUID, timestamp converter, case converter.
Everyday: QR generator, word counter, unit/percentage/age calculators, world clock, "your life in weeks".

The privacy architecture, in one line

If the browser can do it, there's no reason to send the user's data to a server.

That principle killed all the usual costs (no servers, no storage, no compliance headaches) and made privacy the default instead of a feature.

Would love feedback — especially on tools you wish existed. What "online X converter" do you use that you wish ran locally?

👉 quickkit.space