Protect PDF
Add a password to your PDF to restrict access and control permissions.
Drop a PDF here or click to upload
PDF files supported
Everything you need, nothing you don't
Fast, private and precise — built to handle real documents without the friction.
Works in your browser
No downloads, no plugins. Everything runs locally — Chrome, Safari, Edge, or Firefox.
Private by design
Files are processed client-side and never uploaded to our servers unencrypted.
Fast & accurate
Optimized processing engine delivers results in seconds, even for large documents.
Instant download
Download your result right away — no waiting, no email links, no account needed.
Three steps, start to finish
No accounts, no installs. Drop a file and you're already working.
Upload your file
Drag and drop or browse. Your document opens instantly.
Choose your settings
Pick your options and adjust until it's right.
Download
Click Export and save your finished file — ready to send or share.
Related PDF tools
Pair this with the rest of the PDFlow toolkit — every tool works the same simple way.
Frequently asked questions
Everything you might want to know before you upload.
How to password protect a PDF online
Protecting a PDF with PDFlow takes seconds. Upload your document, set an open password, configure permissions, and download the protected file. Everything runs locally in your browser - your file and password are never sent to any server.
Need more PDF tools?
Edit, merge, convert, sign and organize — all in one fast workspace, free to start.
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