Protect PDF with a password
Add a password so only people you choose can open it.
Processed in your browser. Nothing is uploaded.
How to password protect a PDF
- 1
Choose the PDF you want to protect.
- 2
Type a password twice. Use at least 8 characters and keep it somewhere safe.
- 3
Optional: block printing, copying or editing.
- 4
Tap “Protect PDF” and download the encrypted file.
Keep sensitive PDFs private
Bank statements, salary slips, medical reports, contracts and ID scans often travel by email or WhatsApp, where they can be forwarded or opened by the wrong person. A password means only people who know it can read the file. It’s also what many employers, banks and HR teams expect before you send personal documents.
To secure a PDF, add a password to the PDF. Encrypt PDF files with a password using AES-256, so you can lock a PDF with a password before you share it. With PDF password protection in place, nobody can open the file without that password.
Strong encryption, done on your device
Atifo encrypts your PDF with AES-256, the strongest encryption in the PDF standard and the same Adobe Acrobat uses. The work is done by qpdf, a widely used open-source PDF tool, running inside your browser. Your file and your password never leave your device, so there’s no copy on anyone’s server.
Choosing a good password
- Use at least 8 characters; 12 or more is better.
- A short phrase of unrelated words is easy to remember and hard to guess.
- Avoid dates of birth or phone numbers for anything truly sensitive.
- Send the password separately from the file, for example by SMS when you email the PDF.
Optional restrictions
You can also block printing (or allow only low-quality printing), copying text and images, and editing. Restrictions are controlled by a separate permissions password. Adobe Reader and most browsers respect them, but some programs ignore them, so they’re a deterrent rather than real security. The open password is what truly protects the content.
If you need to remove it later
Use Unlock PDF with the same password to save a copy without protection. Without the password, nobody can recover the file, so store it safely.
Frequently asked questions
How secure is the password protection?
Atifo uses AES-256 encryption, the strongest standard for PDFs and the same used by Adobe Acrobat. Without the password the contents can’t be read. A long password (12+ characters) makes guessing impractical.
Can Atifo recover the password if I forget it?
No. The password never leaves your device and isn’t stored anywhere. Keep it in a password manager or another safe place before sending the file.
Will the PDF open on phones and in Chrome?
Yes. AES-256 protected PDFs open in Adobe Reader, Chrome, Edge, Firefox, Safari and phone PDF apps, which ask for the password.
What do the printing, copying and editing restrictions do?
They tell PDF readers to block those actions even after the file is opened. Adobe Reader and most browsers respect them, but some programs don’t, so use them as a deterrent, not as strong protection.
Is my file uploaded to encrypt it?
No. Encryption runs inside your browser using qpdf, an open-source PDF tool. The PDF and the password stay on your device.