All tools
security
Protect PDF
Encrypt a PDF with strong AES-256 and a password — entirely on your device.
This tool runs entirely in your browser. Your files are never uploaded.
Loading the tool…
In short
Protect PDF lets you encrypt a PDF with an AES-256 password, free and online. It runs in your browser, so your file is not uploaded and stays on your device. The free tier covers everyday use; Premium removes ads and lifts all limits.
Not uploaded
Your files
50 MB / file
Free tier
10 tasks
Daily free
Ad-free & unlimited
Premium
How to protect pdf
- 1
Open the Protect PDF tool
Go to the Protect PDF page on FeelPDF — no install needed.
- 2
Add your file
Drop your file — it is processed in your browser and not uploaded.
- 3
Set the options
Choose any options to encrypt a PDF with an AES-256 password.
- 4
Download the result
Click the button and your new file saves straight to your device.
Frequently asked questions
- Does Protect PDF upload my files?
- No. Protect PDF runs in your browser, so your files are not uploaded — you can confirm this in your browser's network tab.
- Is it free?
- Yes. The free tier covers everyday use — up to 50 MB per file and 10 tasks a day. Premium (€4.99/mo) removes ads and all limits.
- Do I need to install anything or create an account?
- No. It works instantly in any modern browser, and the free tier needs no account.
- Is FeelPDF GDPR-friendly?
- For in-browser tools your files are never uploaded at all. The one server-assisted path (Office conversions) runs in the EU with zero data retention.