Protect a PDF Free
Protect a PDF free — genuinely free. No credit card, no trial countdown, no watermark on your output. Add or remove password protection from PDF files.
Most “free” PDF tools aren't really free — they cap file sizes, count your jobs, or stamp a watermark on the result. This one has none of those limits: protect up to 20 PDFs per job, as often as you like, with clean output every time.
The tool is funded entirely by optional premium plans for heavy users. For everyday protecting, the free tier is all you need.
Why use this merger
Truly free
No credit card, no trial clock, no hidden charges. Process as many documents as you need.
No watermarks
Your output is clean. We never stamp a brand or promotional watermark onto your files.
No file-size tricks
Works with real-world documents, not just tiny test files.
No account walls
Free protecting without registration. Upload, protect, download, and close the tab.
How to protect a pdf free
- 1
Upload your PDF
Select the PDF you want to protect or unlock.
- 2
Choose protect or unlock
Pick protect to add a password, or unlock to remove one (you'll need the password).
- 3
Run and download
Download the protected or unlocked PDF.