To password-protect a PDF, upload it to DIT ToolsKit's Protect PDF tool, enter and confirm a password, then click Protect. The tool encrypts the file so it can only be opened with that password.
What is Protect PDF?
Protect PDF adds password encryption to a PDF so only someone with the password can open it. It's a straightforward way to keep sensitive documents — contracts, financial statements, personal records — private when sharing or storing them.
How to use Protect PDF
- Upload the PDF you want to protect.
- Enter a password, then confirm it.
- Click "Protect PDF".
- Download the encrypted file and share the password separately from the file itself.
Benefits of Protect PDF
- Uses standard AES encryption that any PDF reader can prompt for
- Password is set locally — it's never sent to a server
- No limit on how many times you can protect files
- Works alongside every other tool — protect a file right after editing it
Common use cases
- Password-protecting a document before emailing it
- Restricting access to a financial or legal document
- Adding a password to a file before uploading it to shared storage
Frequently asked questions
Can the password be recovered if I forget it?
No — the password can't be recovered from the encrypted file, so store it somewhere safe before you lose access to this session.
What encryption does this tool use?
It uses AES-256 encryption by default, the modern standard supported by current PDF readers.
Can I remove the password later?
Yes — use the Unlock PDF tool with the password you set to remove protection whenever you need to.