Password protect a PDF in your browser
Choose a PDF, type a password and download a copy that won’t open without it. Protect PDF uses AES-256 encryption. You can also ask PDF readers to block printing, editing or copying. Encryption happens in your browser, so the document and the password never leave your device. That is the point when you are protecting a salary slip, a bank statement, an ID scan or a client file.
Open password vs owner password
| Password | What it does |
|---|---|
| Open (user) password | Needed to open the PDF at all. This is the real protection |
| Owner password (optional) | Controls the print, edit and copy permissions. If left blank, the open password is used |
Tips for a strong PDF password
- Use at least 12 characters, or four random words. The password generator can make one.
- Share the password through a different channel from the file.
- Write it down before you close the tab. There is no recovery.
When to use it
- Email payslips, Form 16 or statements to the right person only.
- Send a contract draft that shouldn’t be edited.
- Store scans of ID documents more safely.
Limits
Permission flags (no print, no copy) are honoured by most readers, but not all. If the PDF already has a password, unlock it first with Unlock PDF. A large PDF can be slow on a phone.
Related tasks
Make the file smaller before you send it with Compress PDF, or add a “Confidential” stamp with Watermark PDF.