Add a password to contracts, statements and confidential files before sending them. AES 256-bit encryption is used, and you can block printing, copying or editing after opening.
How to use it
- Choose a PDF file.
- Type and confirm a strong password, and choose what is allowed.
- Click “Protect PDF” and download.
Features
- Standard AES-256 encryption.
- Password strength meter.
- Control printing, copying and editing.
- Opens in every modern PDF reader.
How to choose a strong password
- Make it long — at least 12 characters. A passphrase like “mint-tea-after-sunset-27” is stronger and easier to remember than “P@ss1”.
- Avoid birthdays, phone numbers and company names — they're tried first.
- Use a different password per sensitive file, or keep them in a password manager.
- Mind the keyboard language: a password typed in Arabic won't open if typed in Latin letters.
Open password vs. permission restrictions
The open password encrypts the content — without it the file can't be read. That's the real protection. Print, copy and edit restrictions are honoured by standard PDF readers but aren't an absolute barrier for someone who has the open password and specialised software. Rely on the open password for secrets; use restrictions to guide normal use.
When sending: never put the password in the same message as the file. Email the file and send the password by text or phone call.
Privacy and security
“Protect PDF” runs entirely in your browser using trusted open-source libraries. Your files are never uploaded to a server and no copy is kept, so your documents stay private. It is free and needs no sign-up.
Tip: Store the password safely — it cannot be recovered.