Encrypt PDF

Encrypt your PDF.

Add strong encryption to any PDF before sharing it. Your password is only ever used inside your browser tab — never transmitted.

—Strong PDF encryption

—Password never transmitted

—Works offline

—No account required

—Compatible with all PDF viewers

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 my password sent to your servers?

Never. The encryption key is used only inside your browser's WebAssembly runtime and is never transmitted.

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.