Upload a PDF and type a password twice. Tabreon encrypts the document with AES-256, so it will not open without that password. Encryption runs in your browser, so neither the file nor the password is uploaded. Keep the password safe: it cannot be recovered.
Runs in your browser — nothing is uploaded; your input never leaves your device. How it works
Quick answer
Upload a PDF, type a password twice, and Tabreon encrypts the file with AES-256 so it will not open without that password. The encryption happens in your browser and the file never leaves your device.
Why use Tabreon for this?
The PDF and the password stay on your device. Nothing is uploaded, so no server ever sees either.
AES-256 encryption, the strongest standard PDF encryption, supported by Adobe Acrobat, Preview, Chrome and other current readers.
Free with no account and no watermark added to your document.
How to password-protect a PDF
1Upload your PDF. Add the PDF you want to protect.
2Set a password. Type the password and confirm it. Use something long that you will remember or keep in a password manager.
3Protect and download. Click "Protect PDF" and download the encrypted file.
What does password-protecting a PDF do?
A protected PDF is encrypted: its pages, text and images are scrambled with a key derived from your password. A PDF reader asks for the password before it can show anything, so the file is safe to email or store in a shared folder. Without the password the content cannot be read, and that includes you, which is why a forgotten password cannot be recovered.
How Tabreon handles your data
Encryption runs in your browser. The PDF is read and encrypted locally with AES-256, then saved on your device. Neither the file nor the password is sent anywhere.
Key features
AES-256 encryption
Password confirmation to catch typos
Works in Acrobat, Preview, Chrome and other current PDF readers
No upload: the file and password stay in your browser
Common use cases
Emailing a bank statement or payslip
Sharing a contract or ID scan through a cloud folder
Archiving tax documents on a shared computer
Common mistakes & limitations
A forgotten password cannot be recovered. Keep it somewhere safe.
Very old PDF readers that predate AES-256 (from before about 2008) cannot open the protected file.
A PDF that already has a password must be unlocked first.
Frequently asked questions
The file is encrypted with AES-256, the strongest encryption the PDF standard defines. The real weak point is the password, so use a long one that is not easy to guess.
It cannot be recovered, by Tabreon or anyone else, because Tabreon never sees it. Keep a copy of the original unprotected file or store the password in a password manager.
Yes. Current PDF readers on iOS, Android, Windows and macOS all support AES-256 protected PDFs and will ask for the password.
No. The encryption runs in your browser, so both the PDF and the password stay on your device.