Protect PDF
Add a password to your PDF: it will be needed to open it. AES-256 encryption, plus optional printing and copying restrictions.
Accepted: PDF · Max 300 MB per file
Processed on your device — nothing is uploaded.
How to password protect a PDF
Drop your PDF above.
Choose a password and confirm it; add restrictions if needed.
Click Protect PDF and download the encrypted file.
Good to know
- AES-256 encryption
- The strongest encryption in the PDF standard, the same as Acrobat. Without the password, the content can't be read.
- Optional restrictions
- Block printing, copying or changes. Common PDF readers honour them.
- Nothing is uploaded
- Encryption runs in your browser with qpdf: your document and password never leave your device.
Related tools
- Unlock PDFRemove the password from a PDF whose code you know, or lift its printing and copying restrictions.
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- Fill PDF formFill in a PDF form's fields, or write anywhere on a plain PDF: text, date, check marks, signature.
- Merge PDFCombine several PDFs into one, in the order you choose, with a preview of each file.
- Compress PDFMake your PDF lighter by recompressing its images while keeping text sharp.