Lock PDF
Lock PDF lets you password-protect pdfs and block printing, editing, or copying. directly in your browser with secure server processing.
Drag & drop files here, or click to browse
Max size: 500 MB
Restrictions
Check any actions you want to block. Password is always required unless “Require password to open” is unchecked.
Key capabilities
- Password-protect PDFs and block printing, editing, or copying.
- Secure server processing
- Free to use
How to use
- Upload your PDF.
- Set a password (used as owner password; also required to open unless you uncheck that option).
- Check restrictions to block — print, edit, or copy text/images.
- Uncheck “Require password to open” to let anyone view while restrictions still apply.
- Download the encrypted PDF.
How this tool works
- Upload your PDF.
- Set a password (used as owner password; also required to open unless you uncheck that option).
- Check restrictions to block — print, edit, or copy text/images.
- Uncheck “Require password to open” to let anyone view while restrictions still apply.
- Download the encrypted PDF.
Recommended settings
- Use the default options first, then adjust if needed
Supported formats
application/pdf
File size and limits
- Maximum upload size is controlled in site settings (often 50–100 MB depending on admin configuration).
- Very large or heavily scanned PDFs may take longer to process.
Privacy
Document tools process files on our secure servers. Uploads are stored only temporarily and are deleted after you download the result or after the retention timeout (default 30 minutes).
Common use cases
- Use Lock PDF whenever you need: Password-protect PDFs and block printing, editing, or copying.
Troubleshooting
Processing fails or times out
Try a smaller file, fewer pages, or a lower compression / quality setting. Refresh and upload again.
Download link expired
Results are temporary. Re-run the tool and download promptly.
FAQ
Do you store my files?
No. Files are processed temporarily and automatically deleted. We never permanently store your uploads.
How long are files kept?
Files are deleted after you download the result or after a short timeout (default 30 minutes), whichever comes first.
What is the difference between open password and restrictions?
An open password is required to view the file. Restrictions can block printing, editing, or copying even when no open password is set.