Client-side engine
Protect PDF
Lock a PDF with a password on this device. Free. No upload.
- 50 MB per PDF
- 200 pages
Workflow
How to use Protect PDF
Three steps. Your file is processed in this browser and is not uploaded by this tool.
- 01
Choose a PDF.
Choose a PDF.
- 02
Enter a password and confirm it.
Enter a password and confirm it.
- 03
Download the locked file.
Download the locked file.
Direct answers
Essential questions answered
Short answers for search and answer engines. Same facts as the FAQ.
How do I password protect a PDF?
Choose a PDF, enter and confirm a password, then download the locked file.
Is the PDF uploaded?
No.
Can I unlock it later?
Yes, with Unlock PDF if you still know the password.
Practical applications
Good for everyday workflows
Password-protect a contract PDF
Encrypt a PDF with a user password. The file stays on this device.
Lock a personal scan before emailing
Encrypt a PDF with a user password. The file stays on this device.
Encrypt a PDF without a desktop app
Encrypt a PDF with a user password. The file stays on this device.
Got questions?
Frequently asked questions
Is protect PDF free?
Yes on ToolStudio.
Does this crack other people's PDFs?
No. It only encrypts files you provide.
Is my PDF uploaded?
No.
Related utilities
Related PDF tools
Pick a tool. Get it done.
Free browser utilities on ToolStudio. No account. Most tools keep files on this device.