A PDF can carry two kinds of password. An open password (also called a user password) stops anyone from viewing the file without it. A PDF permissions password (also called an owner password) lets people open the file but limits what they can do, such as printing, copying text or editing. The open password is the real lock; permissions are house rules that most PDF apps follow.
Knowing the difference helps you choose the right protection when you share a contract, a payslip or exam notes, and it explains why some PDFs open normally but refuse to let you copy or print. With Protect PDF you can set an open password and choose which actions are allowed.
Open password vs permissions password at a glance
| Open password | Permissions password | |
|---|---|---|
| Other names | User password, document open password | Owner password, master password |
| What it does | Blocks viewing until the password is entered | Allows viewing but restricts printing, copying or editing |
| What the reader sees | A password prompt before anything shows | The document opens, but some options are greyed out |
| Strength | Strong when the password is long and unique, because the content is encrypted | Depends on the reading app respecting the rules |
| Best for | Private files: IDs, bank statements, medical or legal papers | Discouraging casual copying or printing of shared material |
How the PDF permissions password works
When a PDF has permission restrictions, the file contains flags that say things like “printing not allowed” or “copying text not allowed”. A PDF reader checks those flags and hides or disables the matching buttons. The person who knows the permissions password can change those rules.
The common permission settings are:
- Printing: allowed, not allowed, or in some apps allowed only at low quality.
- Copying: selecting and copying text or images.
- Editing: changing content, adding comments, filling forms or rearranging pages.
The important point: permission flags are a polite instruction, not a wall. Well-behaved PDF readers respect them, but the content is still readable by anyone who can open the file. So never rely on permissions alone for something truly confidential. Use an open password for that.
Which protection should you use?
Use an open password when
The file should not be readable by anyone who might get hold of it: a forwarded email, a lost phone, a shared drive. Examples are ID copies, tax papers, salary slips and medical reports. Share the password through a different channel than the file, for example by phone call if you sent the file by email.
Use permissions when
You are happy for people to read the document but want to discourage casual changes or reuse. Think of a price list for clients, a teacher’s handout, or a final signed agreement you do not want edited by accident.
Use both when
Only certain people should open the file, and even they should not print or change it. This is common for draft reports shared with a small group.
How to protect a PDF with PDFNova
- Open Protect PDF in your browser on a phone or computer.
- Select the PDF you want to protect.
- Type an open password. Use a long one that you do not use anywhere else, and note it somewhere safe.
- Choose the permissions. Tick or untick whether printing, copying and editing are allowed.
- Download the protected copy. Keep an unprotected original in a safe place in case you lose the password.
- Test it. Open the new file to make sure the password prompt appears and the permissions behave as you expect.
PDFNova processes files in your browser, so your documents are not uploaded to a server. That matters most for exactly the kind of files people want to password-protect.
Tips for a password that actually protects
- Use at least three or four unrelated words, or a long mix of letters and numbers.
- Avoid dates of birth, phone numbers and CNIC digits, which are easy to guess.
- Do not write the password in the same email as the file.
- Use a different password for each important document you share.
Removing a password you already know
Sometimes your own protection gets in the way: your bank sends statements with an open password, and you need to merge them or upload them to a portal that cannot open locked files. Unlock PDF lets you enter the password you already know and saves an unlocked copy.
Unlock PDF cannot crack or guess an unknown password. If you do not know it, ask the person or organisation that sent the file. Only remove protection from files you own or have permission to change.
Permissions are not redaction
A common mistake is to restrict copying and assume sensitive text is now hidden. It is not. The text is still in the file, and anyone who can open it can read it. If you need to remove a name, account number or address before sharing, you need redaction, which actually deletes the content. Read how to redact a PDF properly and why a black box is not redaction: 6 mistakes to avoid, then use Redact PDF, which flattens redacted pages so the hidden text is removed.
Frequently asked questions
Why can I open a PDF but not copy text from it?
The file probably has a copying restriction set with a permissions password, or it is a scanned image with no real text. Our guide on how to copy text from a PDF that will not let you explains both cases and the legitimate options.
Is a PDF permissions password secure?
It is useful for discouraging changes, but it is not strong protection. The content can still be read once the file is open. Use an open password for private documents.
Can I remove a PDF password if I forgot it?
Not with PDFNova. Unlock PDF only works with the correct password. Check old emails or messages from the sender, or ask them for a new copy.
Does a password make the PDF file larger?
Not noticeably. Encryption changes how the content is stored, but the size stays about the same.
Ready to lock down a document? Open Protect PDF, set a strong open password, choose your permissions and test the result before you share it.