Lock PDF
Add password protection to a PDF before sharing.
Upload files
Choose a file and hit the action button to process it immediately.
Protect a PDF with a password
Password protection adds a useful access barrier before a PDF is emailed, uploaded, or stored on a shared device. The resulting file is encrypted and readers will need the password to open it.
How to use Lock PDF
- Upload the PDF you want to protect.
- Create a strong, memorable password.
- Select Lock PDF and download the encrypted file.
Common reasons to use it
- Sharing contracts or financial documents
- Protecting forms that contain personal details
- Adding access control before cloud storage
Before you start
Choose a password that is long, unique, and not easily guessed from the document or recipient. A short name, birthday, or common phrase offers weak protection. Finish edits before locking the PDF because later processing may require the password. It is also worth opening the source one last time to confirm that pages, links, and form fields are complete.
Quality and result checks
Encryption protects access to the file but does not replace careful sharing. A recipient who knows the password can still save, photograph, or forward what they see. Send the file and password through separate channels when practical. Test the downloaded PDF in a standard reader before distribution, then preserve an accessible master copy in a secure location.
Frequently asked questions
What makes a good PDF password?
Use a long passphrase or a password-manager-generated value that is not reused for another account or document.
Can the recipient remove the password?
A person with the password and suitable software may be able to create an unlocked copy. Encryption controls entry, not what an authorized reader does afterward.
Does locking a PDF hide its filename?
No. Encryption protects document contents, while the filename and basic file metadata may remain visible to the storage or email system.