Add an opening password to a PDF
Choose a password of at least eight characters and export an AES-256 protected PDF.
How it works
- Choose the supported source file or files from your device.
- Choose an opening password of at least eight characters.
- Export the encrypted PDF and reopen it using that password.
Keep the password safe. Recipients need it to open the document. Processing runs in your browser.
When to use this tool
Require an opening password for a copy of your document.
What to check before sharing
Keep the password safely and share it separately. There is no password recovery service.
Supported files
Add an AES-256 opening password.
Inputs: PDF. Performance depends on your device. Download important work before closing the browser; local storage is not a backup.
Troubleshooting
If the file will not open, check it in another PDF reader. If it is password-protected, use Remove a PDF password with a password you know. For scans that need selectable text, run Make a PDF searchable first.
Common questions
What is this tool useful for?
Require an opening password for a copy of your document.
What should I check in the result?
Keep the password safely and share it separately. There is no password recovery service.
Which files can I use?
Supported inputs: PDF. Add an AES-256 opening password.
Is this free?
Core tools require no account or subscription and add no watermark.
Do my documents leave my device?
Document processing runs in your browser. PDF Studio does not upload document files. Explicitly saved drafts and My files remain in this browser until deleted. Read aloud may use network-backed browser voices.