ALL PDF TOOL

Protect PDF with Password

Encrypt PDF files with strong AES-256 password security online for free.

How to use Protect PDF with Password

  1. Upload the PDF file you wish to secure with password protection.
  2. Enter your desired password in the password input field.
  3. Click "Execute Protect PDF" to apply encryption.
  4. Download your password-protected PDF document.

Technical Details & Specifications

Encryption is applied by setting user/owner password dictionaries and encrypting object streams using Standard 128-bit/256-bit AES algorithms inside pdf-lib.

Frequently Asked Questions

Is my password transmitted over the internet when protecting a PDF?

AllPDFTool encrypts your document locally in browser memory using Standard Security Handler algorithms; your password and files are never sent over the internet.

Will any PDF reader accept passwords created on AllPDFTool?

AllPDFTool produces standard encrypted PDF documents compatible with Adobe Acrobat, Apple Preview, Google Chrome, and all standard PDF viewing software.

What happens if I forget the password I set?

Because AllPDFTool does not store passwords or document copies on any server, forgotten passwords cannot be recovered by AllPDFTool.

Is PDF password protection free on AllPDFTool?

AllPDFTool's Protect PDF tool is completely free with no usage limits.

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