Protect PDF

Add a password to a PDF to restrict who can open it.

Processed in your browser Learn more

1.Import
2.Configure
3.Process
4.Review and download

Drop your files here

or click to browse

PDF · up to 100 MB

Before you start

Prepare a unique password and store it somewhere safe.
After import, review the preview and available settings.
Keep your original to compare the result.

You might also want to…

Unlock PDFRemove the password from a protected PDF by entering it.
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Watermark PDFAdd a text or image watermark to a PDF, with configurable position, opacity and rotation.

How it works

Enter a password and a new AES-encrypted copy of the PDF is produced. Anyone opening the file will be prompted for the password. Encryption happens locally in your browser.

Common use cases

Encrypting a payslip or a tax return before storing it in a shared cloud folder.
Password-protecting a contract before sending it by email so the recipient's inbox breach doesn't leak it.
Adding a layer of protection to a signed document that must not be modified in transit.

Privacy — This tool runs entirely in your browser. Your PDF is never uploaded to our servers — the file stays on your device from start to finish.

Frequently asked questions

What encryption is used?

AES — the modern PDF encryption standard, respected by every PDF viewer including Adobe Reader, Preview, and browsers.

What happens if I lose the password?

The file cannot be recovered. There is no backdoor, no reset, no support ticket. Store the password somewhere safe (a password manager) before you close the tab.