Protect a PDF
— locked with a password.
Drop in a PDF and choose a password. The file can't be opened by anyone without it.
Why use Protect PDF?
Some documents shouldn't be openable by just anyone who gets hold of the file - contracts, financial statements, personal records. This tool encrypts a PDF with a password of your choosing, so it stays unreadable to anyone who doesn't have it.
Key Features
Fast Conversion
Finishes in seconds, with no manual cleanup required afterward.
Secure Processing
Files are processed and deleted immediately after conversion — nothing is kept in long-term storage.
Free Online Tool
No cost, no hidden tiers, no artificial limits.
No Registration
No account, no email, no login. Upload a file and get your result back immediately.
Instant Download
Your finished file is ready the moment conversion completes — no waiting, no email delivery.
Works Anywhere
Runs entirely in your browser tab, on any device, no software to install.
How It Works
Upload
Drop in your file, or click to browse.
Processing
The file is read and converted automatically.
Review Results
See a short summary of what was found, and anything worth a quick double-check.
Download
Download your finished file, ready to use.
Security & Privacy
Encrypted connection. When served over HTTPS, all data traveling between your browser and the server is encrypted in transit using standard TLS encryption.
Automatic file deletion. Uploaded files are deleted immediately after conversion completes; they are never kept in long-term storage.
No data sharing. Your files and extracted data are never shared with third parties or sold.
Frequently Asked Questions
Who can open the protected PDF?
Only someone who has the password you set - it's required to open the file in any PDF reader.
Can I remove the password later?
Yes - use the Unlock PDF tool with the same password to get back an unprotected copy.
Can I protect multiple PDFs at once?
No - Protect PDF handles one document at a time.
Is my password stored anywhere?
No - it's used only in memory to encrypt the file and is never saved.
Is my data secure?
Files are processed and deleted immediately after conversion. Nothing is stored long-term.
Is it free?
Yes, there's no cost and no signup required.