How to Password Protect a PDF (and Limit Printing and Copying)
Keep a sensitive PDF private with a password, and decide what people can do with it once it is open.
PDFixed Team
4 min read
Key takeaways
- A password stops anyone without it from opening the PDF.
- You can also limit printing, copying text and editing for people who do have the password.
- Use a long, unique password and store it safely: PDFixed never sees it, so it cannot be recovered.
- Protecting in your browser means neither the file nor the password is uploaded.
To password protect a PDF, open the Protect PDF tool, type a password, choose what to restrict and download the locked file. Without the password nobody can open it, and PDFixed never sees the password.
Some documents should not be seen by just anyone: a contract, payslips, medical records, a passport scan, financial statements. If you are going to email or share a file like that, a password is a simple safeguard. Whoever receives the file needs the password to open it, even if the email ends up in the wrong place.
This guide shows how to password protect a PDF for free, how to choose a good password, and what the extra restrictions do.
How do I password protect a PDF?
- Open Protect PDF.
- Click Select PDF file, or drop your PDF onto the page.
- Type a password, then type it again to confirm.
- Optional: switch on Also limit what people can do and choose what to allow.
- Click Protect PDF, then Download PDF.
The file and your password stay on your device the whole time. Nothing is uploaded.
What kind of protection do I get?
PDFixed locks the file with AES-256 encryption. That is a strong, widely used standard. Once the PDF is protected, anyone who opens it must type the password first. Modern PDF programs, including Adobe Acrobat and the PDF viewers in Chrome, Edge, Safari and Firefox, support it. Very old programs may not.
Can I limit printing, copying and editing?
Yes. After you switch on Also limit what people can do, you can choose whether to allow:
- Printing
- Copying text and images
- Editing, comments and form filling
People who open the PDF with the password can still read it, but they can only do what you allow.
It is worth knowing the difference between the two kinds of protection:
| Password to open | Printing, copying, editing limits | |
|---|---|---|
| What it does | Nobody can read the file without it | Restricts what readers can do after opening |
| How strong it is | Strong, if the password is good | Respected by most programs, but easier to get around |
| Use it for | Keeping a file private | Discouraging casual copying or editing |
If privacy matters, rely on the password. Use the limits as an extra layer, not the main one.
How do I choose a strong password?
A password is only as good as the words you choose. Follow these rules:
- Make it long. A password of 12 or more characters is much harder to guess than a short one. A few unrelated words strung together works well.
- Do not reuse it. Never use the password you use for email or banking.
- Avoid personal details. Names, birthdays and phone numbers are easy to guess.
- Check the strength meter. The tool shows whether your password is Weak, Good or Strong as you type.
What if I forget the password?
Here is the important part: nobody can recover it. PDFixed never sees or stores your password, which is what keeps your file private. That also means nobody, including us, can open the PDF if the password is lost.
Keep the password in a password manager or another safe place, and keep an unprotected copy of the original in a secure location until you are sure you will not lose access.
How do I share the password safely?
Do not put the password in the same email as the file. A safer approach:
- Send the protected PDF by email.
- Send the password in a different way, such as a text message or a phone call.
How do I remove a password from a PDF?
If you know the password, use Unlock PDF. You can remove the password completely, or keep the password and take away only the printing, copying and editing limits. Only unlock files you have the right to open.
Do I need more than a password?
For everyday sharing, a password is usually enough. If you need to remove private details from a document so they cannot be recovered, a password is not the right tool. See How to redact a PDF properly. And if you are worried about privacy online in general, read Are online PDF tools safe?
Frequently asked questions
Can I password protect a PDF for free?
Yes. PDFixed Protect PDF is free, with no sign-up and no watermark.
How strong is the protection?
PDFixed locks your PDF with AES-256 encryption, a strong standard used widely for protecting files. How safe the file is in practice depends mostly on how strong your password is.
What if I forget the password?
Nobody can recover it for you. PDFixed never sees or stores your password, so keep it in a password manager or another safe place.
Can I stop people from printing or copying?
Yes. Switch on Also limit what people can do, then choose whether to allow printing, copying text and images, and editing. These limits are respected by most PDF programs, but they are weaker protection than the password itself.
How do I remove a password later?
Use Unlock PDF. If you know the password, you can remove it, or you can keep the password and remove only the limits.
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