Lock PDF with Password — Free & Secure
Encrypt your PDF with a strong password. AES encryption applied locally in your browser — your file never leaves your device.
Drag & Drop Your PDF Here
or click to browse your files (single PDF)
document.pdf
0 KB
Secure Offline Storage
Keep your locked PDFs perfectly safe offline with the rugged Samsung 128GB USB Flash Drive.
How to Lock a PDF in 3 Simple Steps
Upload Your PDF
Drag and drop your PDF file into the upload area, or click to browse and select it from your device.
Enter a Password
Type a strong password and confirm it. This password will be required to open the protected PDF.
Lock & Download
Click the Lock PDF button. Your encrypted file is generated instantly and downloaded to your device.
Why Use MyPDF to Lock Your PDF Files?
Unlike other online PDF encryption tools that upload your sensitive documents to remote servers, MyPDF's lock tool processes everything locally in your web browser. Your contracts, financial statements, medical records, and personal documents never leave your device. The AES encryption is applied entirely client-side, making it the safest option for protecting confidential PDFs.
Whether you need to password protect a legal document before emailing it, encrypt financial reports for compliance, or secure personal files, MyPDF handles it instantly with no file size limits and no watermarks. It works on any device — Windows, Mac, Linux, Chromebook, tablet, or phone.
Need more PDF tools? Try our PDF unlocker, PDF merger, or PDF signing tool.
Frequently Asked Questions About Locking PDFs
Is it safe to encrypt PDFs online?
Yes, with MyPDF it is completely safe. Unlike other online tools, your file is processed entirely in your browser using JavaScript. Nothing is uploaded to any server. The encryption happens on your device only.
What encryption standard does MyPDF use?
MyPDF uses AES (Advanced Encryption Standard) encryption, which is the same level of security used by financial institutions and government agencies worldwide. Your PDF is fully protected.
Can I still print a locked PDF?
Yes. By default, printing at high resolution is allowed. However, copying text, modifying content, and adding annotations are restricted to protect your document's integrity.
What if I forget the password?
Since MyPDF does not store your password or upload your file anywhere, there is no recovery option. Please save your password securely. We recommend using a password manager.
