Protect PDF

About password protect PDF

Encrypt a PDF with an opening password using AES-256. Protect a document that needs an opening password before it can be viewed, such as a sensitive statement or file that must be sent to a specific recipient.

This tool is designed for a focused file task, not a broad document-editing workflow. Check the input and output summary above, then use the page preview and settings to describe exactly the copy you want to download.

How PDFolio helps you password protect PDF

Enter and confirm an opening password, then PDFolio creates a separate encrypted copy using AES-256. Use a password you can share safely and store it separately from the protected file, since PDFolio cannot recover it.

Before you process the file, take a moment to check the file list, selected pages, and visible settings. PDFolio creates a new result rather than modifying the source file, which lets you keep the original document as a reference or make another version with different settings.

Before you download

The output requires its opening password in compatible viewers. The current export allows printing but restricts copying and modification. Protection improves control of the copy you share, but someone who can view a document can still take a screenshot or re-create information.

Use clear source filenames and confirm the exact output you need before processing. That small check is especially helpful for sensitive files, repeated versions, or documents with similar page names. The settings shown beside the workspace are the settings applied to the downloaded result.

Choose a unique output filename in your downloads folder if you are keeping several versions of the same document. The original file is never replaced automatically. If you plan to send the result, use the downloaded copy rather than a browser preview, and confirm its page count or file size after processing. This helps prevent confusion between a working source and the final version.

Finish one task at a time for long or sensitive documents. PDFolio uses the same local download flow as other browser files, so your browser may ask where the result should be saved or show its usual download notification.

When the result is ready, download it immediately and open it in your usual PDF viewer to make a final check. You can then use Clear task data to release temporary file references from this browser tab. PDFolio does not create an account, cloud folder, or server-side document history.

A private way to password protect PDF

PDFolio handles the selected files in the active browser tab. A Web Worker on your device performs the PDF task so the interface can remain responsive; document bytes are not sent to a PDF processing server, upload queue, account database, or advertising platform.

Clearing the task, refreshing the page, or closing the tab releases the temporary in-memory task data. This local approach is useful for everyday documents such as contracts, statements, IDs, and school or work files that should not need to pass through a third-party service.