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Free Tool Arena

File & Format Converters · Free tool

Protect PDF

Add a user password to a PDF so only the recipient can open it. All processing stays in your browser.

Updated April 2026

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What it does

Add a user password to a PDF so only the recipient can open it. All processing stays in your browser.

Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.

How to use it

  1. Fill in the inputs or drop your file.
  2. Click the primary button to run.
  3. Copy or download the result.