Password protect
Add an open password to a PDF (AES-256) · Pick another PDF tool from the left menu
1. Choose a PDF
2. Options
🔒 The password is used only inside your browser and is never sent to a server. Encrypts with an AES-256 open password.
3. Run
Everything runs 100% inside your browser — neither files nor passwords ever leave it. For AI summaries and Q&A, use PDF Intelligence.
Merge, split, and compress PDFs in your browser, or add page numbers and passwords. Files are never sent to a server.
What you can do
- ✓Merge · extract pages · split into single pages
- ✓Add page numbers
- ✓Compression (image re-encoding)
- ✓Password protect and unlock (qpdf)
How to use
- 1Pick a tool on the left
- 2Upload a PDF and set the options
- 3Run it and download the result
Supported formats · PDF