Security · Free Tool
Protect PDF Online
Add password protection to a PDF. Processing is free. A free account is required only when you download the finished file.
Select files or drag & dropYour files are processed locally when this tool supports browser processing.
The page is included in V1, but strong PDF encryption/decryption is intentionally disabled until PDFzoid has a server-side qpdf worker. This avoids giving users a false sense of security.
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How to use Protect PDF
1. ChooseSelect the file you want to process.
2. ProcessAdjust the available settings and run the tool.
3. DownloadSave the generated result to your device.
About this tool
Add password protection to a PDF. PDFzoid's base release prioritizes browser-side processing to reduce uploads and keep hosting requirements light. Some advanced conversions will use secure temporary server processing in a later version.
Frequently asked questions
Do I need an account?
You can open and process files without an account. A free PDFzoid account is required only to download the finished result.
Are my files stored?
Browser-side tools process files on your device. When server-based features are introduced, PDFzoid will clearly label them and use temporary storage with automatic deletion.