Protect PDF Files Online
Password encrypt your PDF files to control viewer permissions. Secure your documents locally inside browser memory.
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Drag & drop your files here
or
Choose File Supported: PDF, JPG, PNG · Max size: 50MBConfigure Settings
Analyzing document buffers...
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Your file is ready!
Input Size:
0.0 MB
Output Size:
0.0 MB
Status:
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Success 🎉
Your file is processed locally and deleted from memory after download.
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How to use Protect PDF in 3 steps
1
Select Document
Select and upload the PDF file you want to lock.
2
Configure Options
Enter a strong password in the input field.
3
Download File
Click Protect PDF and download the password-secured file.
RC4 / AES Encryption
Uses standard document encryption to prevent unauthorized access.
Local Key Compilation
Calculates encryption variables locally. Passwords are never sent over networks.
Controls Viewer Permissions
Encrypts PDF content, requiring a password to open and read.
Frequently Asked Questions
How do I password protect a PDF?
Upload your file, type a password, and download the encrypted PDF file.
Are passwords sent to your servers?
No. The encryption processes run client-side; no passwords are sent online.
Can I lock printing permissions?
Yes. Our protection tool locks editing and printing capabilities.
Is there a limit on password length?
No, you can use passwords of any length.
Does this work on mobile?
Yes, works on mobile Chrome and Safari.
Is it free to protect files?
Yes, 100% free with no limits.
What happens if I forget the password?
We do not store passwords. You must remember it to open the file.
How long does encryption take?
Encryption takes under a second.
