Password Protect PDF Free

Password protect for free.

Lock your PDF before emailing it. Free, no upload, and the password never leaves your browser.

—Free password protection

—No upload required

—Password stays local

—Works offline

—Compatible with Adobe Acrobat

Don't trust us.
Verify it yourself.

Open DevTools → Network while converting. You'll see zero outbound requests. Every byte stays inside your browser tab.

—Works offline — no internet connection required

—Nothing is uploaded — ever

—Designed for sensitive documents

ZERO OUTBOUND CALLS

ElementsConsoleNetworkSources

FilterAll · XHR · JS · Wasm

NameStatusTypeSize

converter.worker.js200script48 kB

pdf.worker.wasm200wasm312 kB

✓ No requests to external servers

Powered byWebAssembly·Web Workers·pdf-lib·mammoth.js·Service WorkerAll open source · auditable in DevTools

Is it really free?

Yes. You get 5 free tool uses per day. No account or credit card required.

Is my file uploaded to a server?

No. All processing happens entirely in your browser using WebAssembly. Your file never leaves your device.

Does this work offline?

Yes. Once the page is loaded, you can disconnect from the internet and the tool will still work perfectly.