Protect PDF with Password Online Free - Lock PDF

How to protect a PDF with a password online - no software needed

Protecting PDF documents with a password is essential when you need to share contracts, financial reports, medical records or any confidential file without wanting the content to be accessible to just anyone. With the PDF Protector, you add this security layer directly in your browser, without installing any software.

The process works as follows: the PDF is loaded locally, each page is rendered at high resolution and the resulting file is generated by jsPDF with AES-128 encryption, requiring the defined password for any opening. Important: the resulting PDF will have pages as images, meaning text will not be selectable - but the visual content will be faithfully preserved.

When to use this tool? Ideal for sending contracts that only the recipient should open, protecting financial statements and documents before emailing, locking restricted access reports and audits, or simply adding a privacy layer to any PDF before storing it in the cloud or sharing it.

The password is set only locally on your device and never travels through any server. Keep the password safe: there is no way to recover access to a protected PDF without the correct password. For stronger protection with searchable text, consider desktop tools like Adobe Acrobat or LibreOffice.