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Runs entirely in your browser

Protect a PDF

Encrypt with AES-256 in your browser. The password never leaves this device — which is the only way a password can stay private.

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Secure & archive · quick answer

What Protect PDF does

Use Protect PDF to choose one PDF plus a password, apply AES-256 encryption and document permissions. The password is used locally and is never sent anywhere, but losing it can make the protected copy impossible to open. Filozy starts the document engine only after you choose a file, performs the work inside this tab, and creates a new result for you to save. Your selected document, its filename, and its contents are not sent to Filozy.

How to protect pdf in your browser

  1. Choose one PDF plus a passwordSelect one PDF plus a password from the dropzone. Filozy reads it locally and shows the relevant preview or controls before changing anything.
  2. Review the settingsUse the page preview and available options to decide exactly how protect pdf should handle this document.
  3. Create and check the resultRun the tool, review the reported page count, size, or notes, then save the newly created file while keeping the original.

Limits worth knowing

  • The result depends on the structure and quality of the source document, so visually inspect the exported file before relying on it.

Essential questions

Does Protect PDF upload my file?

No. The selected file is opened and processed by code running in this browser tab. Document bytes and filenames are not sent to Filozy.

Will this change my original file?

No. Browsers cannot silently overwrite the file you selected. Filozy creates a separate result for you to save or pass to another local tool.

See a worked example, troubleshooting and the full FAQ →