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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)
Protect PDF helps you complete this task directly in your browser. You keep control of your data and get the result locally.
Yes. Protect PDF is free to use and runs in your browser without sending files or content to Lmaotools servers for processing or storage.
No. Files and content added to the tools are processed in your browser. They are not sent to Lmaotools servers for conversion or storage.
No. Open the tool, add your file or content, then get the result. Processing happens locally in your browser.