Online PDF tool
Protect PDF with Password Online Free
Encrypt a PDF with a password using a browser-based WebAssembly PDF engine.
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Choose File
Select from your device or drag & drop here.
Your browser handles the file for this workflow unless stated otherwise.
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AES-256 via browser WebAssembly
Preparing…
📱 Mobile friendly⚡ Browser-first🔒 Privacy focused⬇ Direct download
1
Choose your fileSelect the PDF, Office document or image required by this tool.
2
ProcessConfigure the available options and run the task.
3
DownloadDownload your generated document to your device.
Protect PDF with Password in your browser
Encrypt a PDF with a password using a browser-based WebAssembly PDF engine.
This page uses a WebAssembly build of qpdf for client-side password encryption. Browser compatibility can vary; a server qpdf fallback is recommended before large-scale production.