Protect PDF
- Browser-based
- No signup
- Stays on your device
- Your file is processed in your browser and is not uploaded to our servers.
Browser-based
Upload an unlocked PDF, set an open password, and download an encrypted copy. Encryption runs entirely in your browser—your file and password never leave your device.
How to use this tool
1. Upload an unlocked PDF. 2. Enter an open password viewers must type to read the file. 3. Confirm the password. 4. Click Encrypt with AES-256. 5. Download the protected PDF—store the password separately; it cannot be recovered from the file.
Worked example
Example: a tax return PDF encrypted with a 12-character password opens only after the recipient enters it—encryption runs locally in the browser.
How it works
Upload an unlocked PDF, set an open password, and download an AES-256 encrypted copy. Encryption runs entirely in your browser—your file and password never leave your device.
Limitations
Encryption runs locally in your browser. Store your password safely—lost passwords cannot be recovered here.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Important notice
Encryption runs locally in your browser. Store your password safely—lost passwords cannot be recovered here.
Frequently asked questions
Is the Protect PDF free to use?
Yes. Utilnivo tools are free to use and do not require an account.
Are my inputs stored?
Utilnivo does not require an account. See the privacy note on this page for how your data is processed for this tool.
How do I get started with Protect PDF?
Open the tool on this page, enter your inputs, and use the on-screen controls. No account is required.
Part of these workflows
This tool is one step in a longer job. Jump straight to your step or open the full workflow guide.
Related tools
Related pages
- Secure PDF — compare pdf tools and read FAQs
- Merge and secure a PDF packet — step-by-step workflow
- Browse all free online tools on Utilnivo
- Explore more pdf tools on Utilnivo
- Remove PDF Password — Unlock a PDF when you know the password.
- Sign PDF — Place a JPG or PNG signature on a PDF in your browser.
- PDF Form Filler — Fill AcroForm fields in a PDF in your browser.
- Merge PDF — Combine multiple PDF files into one document.
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