Protect a PDF with a Password
Encrypt a PDF so it can only be opened with a password. Uniquely sensible here: on a normal converter site you'd be uploading the document and typing its new password into someone else's server. Both stay on your device.
✅ 100% Free🚫 No Watermark🔒 No File Upload📱 Works on Mobile⚡ Instant Result🙅 No Signup
This page processes your file inside this browser tab. It makes no network requests with your data — check it yourself in 10 seconds.
How it works
- Choose the PDF to protect.
- Type the password twice — it is used locally and never transmitted.
- Download the encrypted file. Anyone opening it will need the password.
Who uses this tool
🔒 Your files never leave your device
There is no upload step to worry about, because there is no server. The file you choose is processed by your own browser, on your own device, and the result downloads straight from its memory. Once this page has loaded, the tool keeps working with the internet disconnected — try it in airplane mode. Unlike sites that promise to “delete your files after one hour”, there is nothing to delete: your file was never sent anywhere. See how to verify this yourself →
💡 Tips for the best result
- Share the password over a different channel than the file — text the password, email the file.
- There is no “forgot password” here: nobody but you ever had it. Keep a note of it.
- Encryption protects the file's contents; the filename stays visible — name it neutrally.
Frequently asked questions
Is the password sent to a server?
No — encryption runs in your browser, and the page can't transmit anything anyway. Try it offline.
What encryption is used?
Standard PDF encryption (AES), compatible with Adobe Reader, browsers, and every mainstream PDF viewer.
Can you recover the password if I forget it?
No — and that's the point. The password never existed anywhere except your device.
Can I remove a password later?
Yes — the unlock tool removes protection when you supply the current password.