Protect PDF
Add a password to your PDF.
Drag & drop your file here
or click to browse
pdf, pdf · Max 100 MB
Privacy: Your files are processed entirely in your browser and are never uploaded to any server. All data is automatically cleared after processing.
How it works
Upload
Drop your file into the upload area above.
Process
Protect PDF runs instantly in your browser — no waiting for server processing.
Download
Download your Protected PDF. Your files are then automatically deleted from memory.
Related Tools
About Protect PDF
Protect PDF encrypts your document with AES-256 so only authorized users can open it. DocFlow AI encrypts entirely in your browser — the password is never sent to any server. The strongest standard supported by Adobe Acrobat, Preview, and Chrome.
Why use Protect PDF?
- AES-256 encryption (PDF revision 6).
- Password never leaves your device.
- Print and copy still allowed after unlock.
- Free, instant, no watermark.
When to use Protect PDF
Frequently Asked Questions
Is my password sent to a server?
No. The encryption happens entirely in your browser using AES-256. Your password never leaves your device.
What encryption is used?
Your PDF is encrypted with AES-256 (PDF revision 6), the strongest standard supported by PDF readers like Adobe Acrobat, Preview, and Chrome.
Can I still print or copy from the protected PDF?
Yes. By default, printing and copying are allowed after entering the password. The protection prevents opening the file without the password.