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- 2Options
- 3Process
- 4Preview
Upload PDF files
Drag and drop files here, or click to browse
PDF · up to 100.0 MB per file · single file
About Protect PDF
Add a password to your PDF so only people with the password can open it. OyoPdf Protect PDF applies encryption in your browser — your document and password are not sent to our servers.
Password protection is useful for contracts, tax forms, and internal reports shared by email. Choose a strong password and share it through a separate secure channel.
Prefer a walkthrough? Read How to Password Protect a PDF Online.
How to protect pdf
- Upload the PDF you want to protect.
- Enter and confirm a password.
- Download the encrypted PDF.
Frequently asked questions
- Is Protect PDF free on OyoPdf?
- Yes. Protect PDF is free with no account required for standard use.
- Are my files uploaded to your servers?
- This tool runs in your browser on your device. Your PDF is not uploaded to our servers for processing.
- What encryption is used?
- OyoPdf applies standard PDF password encryption compatible with most PDF readers.
- Is Protect PDF free?
- Yes. Protect PDF on OyoPdf is free for everyday use with no account required.
- Are my files private?
- OyoPdf is privacy-first. Processing runs in your browser whenever possible so files stay on your device.
- What file size is supported?
- Most tools support files up to 20 MB per upload.