Can this recover a forgotten password?
No. Unlocking requires the correct user or owner password and does not attempt guessing or circumvention.
- AES-256 protection
Guide
Control PDF password protection locally without disclosing the document or password to a server.
Add AES-256 password protection to a PDF or remove protection using a password you already know, entirely on this device.
Clear answers
Control PDF password protection locally without disclosing the document or password to a server.
Add AES-256 password protection to a PDF or remove protection using a password you already know, entirely on this device.
Which encryption is used?
New protected copies use AES-256 by default.
- Known-password unlocking
Does NullKit see the password?
No. It remains in the current page and is used only by the local PDF engine.
- Local permission controls
A local check
Control PDF password protection locally without disclosing the document or password to a server.
Add AES-256 password protection to a PDF or remove protection using a password you already know, entirely on this device.
Selected file
Choose a PDF and select protect or unlock mode.
Choose a PDF and select protect or unlock mode.
Review before sharing
Known-password unlocking
For protection, create and safely store a strong password; for unlocking, enter the current password.
Local verification
Process the document locally.
Process the document locally.
Verify the output and remove temporary password copies.
Four local steps
Which encryption is used?
- 01
AES-256 protection
Choose a PDF and select protect or unlock mode.
- 02
Known-password unlocking
For protection, create and safely store a strong password; for unlocking, enter the current password.
- 03
Local permission controls
Process the document locally.
- 04
AES-256 protection
Verify the output and remove temporary password copies.
Browser privacy
Protect or Unlock a PDF
AES-256 protection
No. Unlocking requires the correct user or owner password and does not attempt guessing or circumvention.
Known-password unlocking
New protected copies use AES-256 by default.
Local permission controls
No. It remains in the current page and is used only by the local PDF engine.
Clear answers
Does NullKit see the password?
No. It remains in the current page and is used only by the local PDF engine.
- This tool does not crack, guess, or recover unknown passwords.
- PDF permission flags depend on reader cooperation and are not a substitute for encryption.
- Losing the password can make the protected copy inaccessible.
Private workspace
Protect or Unlock a PDF
Control PDF password protection locally without disclosing the document or password to a server.