Password Protect PDF — Encrypt Online Free
Add a password and permissions to a PDF using strong encryption, processed in your browser. The file and password never leave your device.
🔒 Files are processed on your device — nothing is ever uploaded to a server
Sending salary slips, IDs, or contracts? Encrypt the file first. Because MyPDF is client-side, not even we could see your password or your document.
How it works
- Open the PDF you want to protect.
- Set an open password and optional restrictions (printing, copying).
- Download the encrypted file and share the password via a different channel.
Why MyPDF
- Truly private — Everything runs inside your browser. Your files are never uploaded, stored, or seen by anyone — unlike most online PDF sites.
- Free with no sign-up — No account, no daily limits on core tools, no watermarks added to your files.
- Fast — No upload/download round-trip to a server. Large files start processing instantly.
- Works everywhere — Any modern browser on Windows, Mac, Linux, Android, or iPhone. Installable as an app (PWA).
FAQ
How strong is the encryption?
Standard PDF AES encryption, applied locally in your browser.
What if I forget the password?
There is no backdoor — keep an unencrypted original for yourself.
📖 Full guide: Password-protect a PDF the right way