How do I password-protect a PDF for free?

Go to https://www.fileflip.org/tools/protect-pdf, upload your PDF, set a password, and download the protected file.

Is the PDF uploaded to a server?

No. Encryption happens in your browser. Your document never leaves your device.

FileFlip uses AES password encryption for PDF security.

Yes. No registration or watermarks.

Protect your PDF with a password online for free. Set owner and user permissions. No upload to servers — encryption happens entirely in your browser.

1Upload

2Protect

3Download

Drop your PDF here or click to upload

Is my PDF safe?: Yes. Encryption runs on the server and the file is deleted immediately after processing.
What encryption is used?: AES-256, the strongest standard for PDF documents.
Can I open the protected PDF on any device?: Yes, any PDF reader supports password-protected PDFs.
Can I remove the password later?: Yes, use the Unlock PDF tool with the same password.