Set a password on your PDF file to control access. Quick, simple, and processed entirely on your own device.
Add password protection to your PDF
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Professional-grade tools powered entirely in your browser.
Reduce file size up to 90% while maintaining quality
Convert JPG, PNG, WEBP images into a PDF document
Combine multiple PDFs into one single file
Extract pages or split PDF into multiple files
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Export each PDF page as high-quality PNG image
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Add password protection to your PDF
Securing sensitive documents is essential in today's digital environment. Whether you are sharing confidential financial reports, legal agreements, or personal records, locking your files with a strong password ensures that only authorized individuals can open them. Our PDF Protector tool allows you to secure your documents instantly without needing complex software or paid subscriptions.
When it comes to passwords and confidential paperwork, privacy is non-negotiable. AIFreePDF handles your files directly inside your web browser using client-side execution. Because your sensitive documents are never uploaded or stored on an external cloud server, you maintain absolute control and security over your data.
Protecting your file takes just a moment. Drag and drop your target PDF into the upload zone, enter your desired password credentials, and apply encryption. The browser processes and secures your file instantly, letting you download the locked document right away.
Secure your confidential paperwork today using AIFreePDF — the fast, private, and free solution for document security.
Drag & drop or click to select your file. Nothing is sent to any server.
Choose your settings. Every tool gives you full control over the output.
Your processed file downloads instantly. Done.