Lock PDF
Create a password-protected PDF copy in the browser by rebuilding pages into an encrypted PDF.
✓ No signup✓ Mobile friendly✓ Clear limitations✓ Browser-first where practical
Recent tools are remembered only on this device.
Password-protected output. To add encryption reliably in-browser, pages are rebuilt as images. Selectable text and vector content are not preserved.
Why use this lock pdf?
Lock PDF creates a password-protected copy using browser PDF encryption.
Example
Protect a visual copy before sending it to a recipient.
Important note
Pages are rasterized during this workflow, so selectable text and vector quality are not preserved.
How to use it
Start with the inputs shown above, review any options or assumptions, then generate the result. Where the tool creates a file, keep the original until you have opened and checked the downloaded output.
Frequently asked questions
Is this tool free?
Yes. The core tool is free to use.
Do I need an account?
No. You can use it without signing up.
Does it work on mobile?
Yes. Toolbox is designed for modern mobile and desktop browsers.