Free online tool
Protect PDF online — add a password free
Add a password to your PDF so only authorized people can open it. OyoPdf Protect PDF encrypts in your browser for privacy.
Free, fast, and no sign-up required.
Why use OyoPdf
- Free PDF password protection
- Browser-based encryption
- No account required
- Download encrypted PDF instantly
- Compatible with standard PDF readers
How to protect pdf online
- Upload your PDF to Protect PDF.
- Enter and confirm a password.
- Download the protected file.
Frequently asked questions
- Is protect PDF free?
- Yes. Protect PDF on OyoPdf is free.
Learn more
Read the full guide: How to Password Protect a PDF Online. Browse all PDF guides or conversion tools.