ViBlockPDF is a free tool that allow you to add security properties to your PDF file
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Updated
Mar 28, 2019 - Java
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lock-pdf
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PDF Password Protector — Encrypt and lock any PDF with a strong open password — entirely in your browser. Set permissions, check password strength, and download a secured file in seconds. No upload, no account, password never stored. Free on ToolAdda.online.
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Updated
Aug 1, 2026
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