How to password protect a PDF and check access
By PDFEditor.ae · Published
Steps
- Open Protect PDF and upload the file.
- Enter a password. Optionally enter a different owner password.
- Click Protect and download the encrypted PDF.
Check that it works
We test this with two independent PDF readers on a sample file: without the password or with a wrong one the file does not open; with either the open or the owner password it does.
- Open the downloaded file. It should ask for a password before showing anything.
- Try a wrong password: it should refuse.
- Enter the right password: the document should open normally.
What the protection does
- The file is encrypted with AES-256. Without the password, the contents cannot be read.
- Copying and editing are switched off in the file permissions, but some PDF apps ignore those flags once the file is open. The open password is the real protection.
- A short or guessable password can be cracked; use a long passphrase.
- Lost passwords cannot be recovered by us. Keep an unprotected copy somewhere safe.
Open password or permissions password?
An open password is needed to view the file at all. A permissions (owner) password controls actions such as editing or copying in apps that respect it, but does not stop anyone reading the document. Protect PDF always sets an open password; the optional owner password is for changing those settings later.
Sharing the password
Send the password through a different channel from the file — for example, email the PDF and tell the recipient the password by phone. Sending both in the same email protects nothing if the email is forwarded.
Agree the channel in advance
For urgent documents, agree how you will send the password — a phone call or an approved messaging app — before you send the file, and check the protected copy opens with it. A mistyped password discovered at the last minute delays everything.