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Password Protect a PDF Online
Apply password protection to a PDF using the password you supply. Download a protected copy and keep the password separately for people who need access.
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Encrypt PDF
Password protect PDF
How to add a password to a PDF
Prepare the source
Select the PDF to protect.
Review the settings
Enter the required password and review the optional owner password.
Check the result
Start Conversion and verify that the protected PDF opens with the intended password.
Supported formats and limitations
Input: PDF. Output: Protected PDF. Protection is applied on the server after upload. It does not make the upload a local-only operation, and the tool does not recover forgotten passwords.
Processing runs on the server after you select Start Conversion. The interface accepts files up to 500 MB; service and connection limits can be lower. No installation or account is required. Read our file processing privacy policy.
Why Use ConvertFast's Encrypt PDF?
- Create a password-protected PDF copy.
- Set passwords through the dedicated protection fields.
Frequently Asked Questions
Can ConvertFast recover the password later?
There is no password recovery workflow. Keep the password and original document in a safe place.
Is encryption performed in my browser?
No. The PDF and supplied password are sent to the conversion service when you start processing.
Ready? It's Free.
No account required. Input rules appear before you upload.
Open Encrypt PDF Tool