Free PDF Encryptor - Fast Browser Tool
Add a secure password to your PDF files in seconds. Fast, private, and easy to use with no software installation required.
Select PDF File to Protect
Drag & drop your PDF file here, or click browse to choose from your device.
Supported format: .pdf (Up to 100MB)
This PDF is Already Password-Protected
This document is encrypted with an existing password. To remove protection or change password, use our Unlock PDF tool.
Your PDF is Protected!
Your document has been encrypted with a secure password. Only authorized users with your password can open it.
How to Password Protect PDF Online
Lock and encrypt PDF documents in 4 simple, browser-based steps.
Upload PDF Document
Select or drop your PDF file into the dropzone from any device.
Set Secure Password
Type your strong password and re-enter it to confirm encryption credentials.
Click Protect PDF
Click Protect PDF to securely upload and encrypt your document in server memory over HTTPS.
Download Encrypted PDF
Download your password-protected PDF document ready for safe sharing.
Why Choose Our Free PDF Protector
Maximum privacy, AES-256 encryption, and in-memory server processing.
Secure HTTPS & In-Memory Encryption
Your PDF is securely uploaded over an encrypted HTTPS connection, processed strictly in server memory, and deleted immediately after protection.
Instant Execution
Protect your files in milliseconds without waiting in server queues or uploading big attachments.
Free with No Restrictions
No account signup required, no file quantity limits, and zero watermarks inserted into your files.
Your Documents Stay 100% Private
Your PDF is securely uploaded over an encrypted HTTPS connection, processed in memory on our servers, and automatically deleted immediately after password protection. We never permanently store your files or passwords.
Protect PDF Online FAQs
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