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Protection adds an opening password. Encryption is applied via PDFLib in the browser, without file transmission. The tool rejects passwords that are too weak (fewer than 6 characters).
Free, no account required, browser processing and no server upload.
Drop a file — Protect PDF
Drag and drop your file here · Choose a file from your device
Max 100 Mo
Protection adds an opening password. Encryption is applied via PDFLib in the browser, without file transmission. The tool rejects passwords that are too weak (fewer than 6 characters).
Security rules
This protection prevents opening the file. To restrict printing or modification without a password, use a desktop PDF application.
Opening password
Prevents opening the PDF
Yes
Print restriction
Prevents printing
No (desktop software required)