Protect your PDF files with password encryption directly in your browser. No uploads, no servers, complete privacy. Your files never leave your device.
Upload your PDF and protect it with a password — all processing happens locally in your browser
Your file will be processed locally — never uploaded to a server
Secure your PDF files in 3 simple steps
Drag and drop your PDF file or click to browse. Your file stays on your device — we never upload it to any server.
Enter a secure password to protect your PDF. We use industry-standard AES-256 encryption for maximum security.
Download your password-protected PDF instantly. It works with all major PDF readers like Adobe Acrobat.
The most secure way to pdf password protect online
All encryption happens in your browser. Your PDFs and passwords never leave your device or touch our servers.
We use AES-256 encryption, the same standard used by governments and militaries worldwide to protect sensitive data.
Process your PDFs instantly without waiting for uploads or downloads. Everything happens locally at maximum speed.
Access from any device — desktop, tablet, or mobile. No installation or registration required.
Protect unlimited PDFs at no cost. No hidden fees, no premium plans, no watermarks — completely free forever.
Protected PDFs work with all major PDF readers including Adobe Acrobat, Preview, Chrome, and more.
Start securing your documents with password protection in seconds
Protect PDF NowEverything you need to know about PDF password protection
Absolutely! PDF2Locker processes everything locally in your browser using client-side encryption. Your PDF files and passwords never leave your device and are never uploaded to any server. This makes it even safer than traditional online tools that require file uploads.
When you upload a PDF and enter a password, our JavaScript code running in your browser applies AES-256 encryption directly to the file. The encrypted PDF is then generated on your device and offered for download. No data is transmitted to any server during this process.
Yes! The password-protected PDFs created by PDF2Locker use standard PDF encryption that is compatible with all major PDF readers including Adobe Acrobat Reader, Preview (Mac), Chrome PDF viewer, and more.
Since processing happens in your browser, the limit depends on your device's memory. Most modern devices can easily handle PDFs up to 50-100 MB. For very large files, processing may take longer but will still work.
No! PDF2Locker is completely free and requires no registration, login, or account creation. Simply visit the site and start protecting your PDFs immediately.
PDF2Locker uses AES-256 encryption, which is the industry standard for PDF password protection. This is the same encryption level used by governments and financial institutions worldwide.