Password Protect Your PDFs
Add password protection, encryption, and restrictions to your PDF documents. Batch process multiple files at once. Free, fast, and secure.
Your privacy is protected
All uploaded files are automatically deleted after 1 hour. Files are encrypted in transit and only used for processing. We do not access, read, or share your documents.
Drag & drop PDF files or folders here
or click to browse files
Why Use PDF Locker?
The simplest way to password-protect your PDF documents with enterprise-grade security. No software needed.
Military-Grade Encryption
Protect your PDFs with AES-256 bit encryption — the same standard used by banks and governments. Set open passwords, permission passwords, or both.
Works on Any Device
Lock PDFs online from any browser, on Mac, Windows, iOS, or Android. No software installation required — just upload, lock, and download.
Safe From Start to Finish
Your documents are protected with TLS encryption in transit, and all files are automatically deleted after one hour. Your documents are for your eyes only.
Full Control Over Permissions
Restrict printing, copying, editing, and page extraction. Decide exactly what recipients can and cannot do with your document.
No Signup Required
Start protecting your PDFs immediately. No account creation, no email verification, no credit card. Just upload and secure your files.
Batch Processing
Lock multiple PDFs at once. Upload an entire folder and apply the same protection settings to all files in seconds.
How to Lock a PDF Online
Protect your PDF documents in four simple steps. No account required.
Upload Your PDF
Drag & drop your PDF files or folders into the tool, or click to browse and select files from your device.
Set Your Password
Enter an open password, a permission password, or both. Choose your encryption method and restriction preferences.
Configure Restrictions
Select which actions to restrict — printing, copying, editing, page extraction, commenting, and more.
Download Locked PDF
Click "Lock All" and download your password-protected PDF. For multiple files, download them all as a convenient ZIP archive.
Frequently Asked Questions
Everything you need to know about locking and protecting your PDF documents.