Encrypt PDF
Add a password and encryption to protect a PDF.
- 100% Private
- No Limits
- Works Offline
or drag and drop here
Add real AES-256 password protection to a PDF using qpdf — the same trusted engine many desktop and server tools rely on — compiled to run entirely in your browser.
How to use this tool
- 1
Upload your PDF
Click the upload area or drag in the document you want to protect.
- 2
Set a password
Type a password and confirm it.
- 3
Encrypt and download
Your password-protected PDF downloads immediately — nothing is uploaded first.
Why use this tool
Nothing leaves your device
Encryption runs locally via qpdf compiled to WebAssembly — your document and password never touch a server.
Real AES-256 encryption
Uses qpdf's standard security handler, not a simplified or custom scheme.
One password, fully protected
The same password is required to open and to change permissions — simple to use and remember.
Common use cases
Protect sensitive documents
Add a password before emailing contracts, financial statements, or personal records.
Secure an archive
Password-protect documents before storing them long-term.
Share safely
Send a protected file and share the password separately through a different channel.
Pro tips
- There's no way to recover a lost password — store it in a password manager.
- Share the password through a different channel than the file itself (e.g. a text message, not the same email).
- Use Remove Password later if you no longer need the protection.