How to password protect a PDF
Updated 3 min readBy Total PDF Tools
Quick answer
To password protect a PDF, open Protect PDF, add the file, type a strong password and click Protect. The PDF is encrypted with AES-256, the strongest encryption in the PDF standard, so nobody can open it without the password. You can also restrict printing, copying and editing. Encryption happens in your browser, so the unprotected file is never uploaded.
Open Protect PDFStep by step
- 1
Open Protect PDF
Go to the Protect PDF tool and add the PDF you want to secure.
- 2
Choose a password
Type a long passphrase of several words. The strength meter shows how strong it is.
- 3
Set permissions (optional)
Choose whether people who open the file may print, copy text or edit it.
- 4
Protect and download
Click Protect and save the encrypted PDF. Keep an unprotected original somewhere safe.
Open password vs permissions
The open password encrypts the whole document: without it, the content is unreadable. Permissions (no printing, no copying, no editing) are rules that PDF viewers are expected to follow. Reputable viewers honour them, but they are not a substitute for encryption, so always use a password for sensitive documents.
Sharing a protected PDF safely
Encryption only helps if the password stays private:
- Send the password through a different channel than the file, for example the PDF by email and the password by text message or phone.
- Avoid passwords based on names or birthdays; a few random words is stronger and easier to remember.
- Remove hidden metadata before protecting a file you'll share outside your organization.
Frequently asked questions
Can you recover a PDF password if I forget it?
No. AES-256 encryption can't be bypassed, and we never see your password. Keep an unprotected copy or store the password in a password manager.
How do I remove the password later?
Use Unlock PDF and enter the password once. It saves a copy without encryption.
Will the protected PDF open on any device?
Yes. AES-256 is supported by all current PDF readers, including Adobe Acrobat, browser viewers and the built-in viewers on iPhone and Android.