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 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
How to use it
- 1Select or drag in the PDF to protect.
- 2Enter a password for opening the file.
- 3Download the encrypted PDF.
Frequently asked questions
Is the password stored on a server?+
No. Encryption runs in your browser, so neither the PDF nor the password leaves your device.
Which apps can open it?+
It uses standard PDF encryption, so most PDF viewers can open it after you enter the password.
Can I recover a forgotten password?+
No. A forgotten password can't be recovered, so keep it somewhere safe.
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