Protect PDF

Add password protection to your PDF using AES-256 encryption. Set permissions for printing, copying, and editing.

Upload

Options

Encrypt

Download

AES-256 Encryption

Password protection runs in your browser without uploading document bytes to LocalPDF for processing. Test the result in your required PDF reader.

Drag & drop your PDFs here

or click to browse your files

Max 100 MB per file

Select a PDF to protect

Capabilities and limits

Accepts: PDF, Password
Produces: AES-256 encrypted PDF
Limits: 100 MB per file

Reproduce this Protect PDFs example

Use the synthetic test password shown in the automated test; never reuse it for real documents.

Reviewed fixtures

1-page synthetic PDF — 1252 bytes

Expected facts

The download is a non-empty password-protected PDF.
The workflow sends no observed document-content request.

Proof owner: tests/tool-workflows.spec.ts — protects the fixture and observes network requests

Open Protect PDFs Verify fixture hashes and method

What happens to your document

1. Browser inputYour browser reads the file you select. Document bytes are not sent to a LocalPDF processing API.
2. Local resultThe tool performs the operation in this tab and creates its result in browser memory.
3. Your downloadYou choose whether to download the result. Browser memory is cleared when the page is closed or reloaded.

Why Process PDFs Locally?

Supported workflows process document bytes in the browser without a document-byte upload to LocalPDF. Device, browser, extension, download, storage, and later-sharing risks remain separate boundaries.

Review the no-upload verification method →