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Protect PDF — AES Encryption
Chapter 05 — Security

Protect PDF files.

Encrypt with AES-256, control what recipients can do, and set separate owner password. All done locally in your browser.

Select or drop a PDF to protect

Encrypt with password, restrict permissions, and secure your PDF. Nothing leaves your device.

Choose PDF file
AES-128 / 256
Dual passwords
Permission control
Client-side only
Back to all tools

About Protect PDF

Use this online tool to set password protection on a PDF document. Check the available file options and review the downloaded result before using it elsewhere.

Frequently asked questions

What does Protect PDF do?

Protect PDF is an online tool designed to set password protection on a PDF document. Open the tool page to see its current options and supported inputs. Review the result after processing, especially when the document is important for work, records, printing, or submission to another service.

How do I use Protect PDF online?

Open the Protect PDF page, choose the file or files requested by the upload area, and adjust any options shown. Start processing, wait for the result, and download it when ready. Keep your original file until you have checked that the output is correct and complete.

Is Protect PDF free to use?

The online Protect PDF tool is available without a paid subscription or account signup. Use the options displayed on the page and check the output before relying on it. The optional physical E-Aadhaar PVC card printing service is separate from the online document tools.

Are files private when I use Protect PDF?

File handling depends on the operation: some tools process files in your browser, while other features may use server processing. Check the page and privacy policy for the applicable handling before uploading sensitive material. Only upload files you are authorized to process.

Which file formats and sizes does Protect PDF support?

Supported formats and practical size limits vary by tool, browser, and device. The upload control on this page identifies accepted file types, and any processing limits are shown as you use the tool. For best results, start with a readable source file and verify the downloaded output.