Adds standard PDF encryption with a user (open) password and optional owner password restricting printing and copying. Encryption is applied in the browser with a pdf-lib fork.
Password-protect a PDF
Encrypt a PDF with a user password and set permission flags.
Password-protect a PDF: Encrypt a PDF with a user password and set permission flags. Add your file to the tool above, apply it, and download the result — free, in any browser, with no sign-up.
- 100% free — no sign-up
- Files processed privately
- Fast — no upload wait
- No file-count limit
About this tool
How to use Protect PDF
1. Add your file
Drop your file onto the Protect PDF workspace above, or click to browse for it.2. Choose the options
Adjust the settings for protect pdf — the defaults work for most files.3. Download the result
The result is generated in your browser — nothing is uploaded. Click Download to save it.
Frequently asked questions
Is Protect PDF free to use?
Yes. Protect PDF is completely free with no watermark, no account, and no file-count limit.
Are my files uploaded to a server?
No. Processing happens in your browser using WebAssembly and the Canvas API. Your documents never leave your device.
Which browsers are supported?
Any modern browser — Chrome, Edge, Firefox, or Safari. No extension or desktop app is required.
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