Security
Protect with password
Encrypt a PDF with AES-256 and require a password to open it.
Security
Password protect a PDF
Encrypt a PDF with AES-256 so it needs a password to open. Passwords of 10 to 128 characters. Free, and the password is never stored.
200 MB per fileUp to 200 MB per jobNo account required
Ephemeral by designEach job gets an isolated temporary folder that is removed after its response completes.
Safer processingFile signatures, page counts, dimensions, output sizes, and processing time are constrained.
Honest privacyFiles are processed on this server over HTTPS—not inside your browser.
About this tool
Lock a document before you send it. The PDF is encrypted with AES-256, the standard used by current PDF readers, and anyone opening it must enter the password you set. Choose at least ten characters; a short password on an encrypted file can be guessed by software fairly quickly.
How to use it
- Drop one PDF.
- Type a password of 10 to 128 characters. Write it down somewhere safe; it cannot be recovered.
- Click Protect PDF and download the encrypted copy.
Questions
Is the password stored anywhere?
No. It is used once to encrypt the file and then discarded with the temporary job folder.
What if I forget the password?
There is no recovery. Keep an unencrypted copy of the original for yourself.
Will the protected PDF open on a phone?
Yes. AES-256 is supported by every mainstream PDF reader, including the built-in ones on iOS and Android.