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Password-protect a PDF

Put a password on the file

Up to 200 MB at a time. On a phone, large documents take longer and need more memory.

AES-256 encrypts the content. Print, copy and edit restrictions are only honoured by programs that support them. If you lose the password, we can't recover it.

You can pick several PDFs. Each gets its own result, and you can also download them all as one ZIP.

The password isn't kept in the address bar, browser history or temporary transfer.

Your file stays on your device. No sign-up, no limits.

To password-protect a PDF, type the password twice and save the encrypted copy. From then on the file won’t open without it. With a second, owner password you can restrict printing, copying and editing, though only programs that support these settings respect them. Encryption is AES-256, and the password needs at least 8 characters.

How it works

This tool can’t recover a lost password. Write it down before you delete the unprotected original.

Enter the password, repeat it, add an owner password if you want restrictions, and press “Protect PDF”.

Worked example

You’re emailing payslips for 12 employees to your accountant. Protect the PDF with a password of at least 8 characters and give it to them by phone or text, never in the same email as the file.

Questions people ask

How do I stop people copying text from my PDF?

Set an owner password and turn off copying. Bear in mind this is only an instruction to PDF software. It does nothing against a screenshot or a photo of the screen.

Will a protected PDF open on a phone?

Yes. Any modern PDF reader asks for the password and then opens the document.

What makes a good PDF password?

At least 12 characters, ideally three or four unrelated words. Avoid names, dates of birth and anything that appears in the document itself.

Is my file uploaded to encrypt it?

No. Encryption happens in your browser, and the password isn’t stored in the address bar or history.

More tools

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Updated: 13 November 2026