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🔒 Protect PDF

Encrypt with a password.

Files stay in your browser for this tool

Runs in your browser — your file is never uploaded for this tool. How we handle files →

🔒

Drop your PDF file here

PDF files up to 50MB

Preview

1 / 1

Password to set (required)

🛡️ Runs in your browser — file does not upload for this tool.

How to use Protect PDF

📁

Upload

Click Choose File or drag & drop. Up to 50MB.

⚡

Process

Browser-based — zero upload, instant.

⬇️

Download

Save your file. Free, no watermark, no limits.

Is Protect PDF free?

Yes, completely free. No account, no watermark, no daily limits.

Are my files safe?

Files are processed 100% in your browser using JavaScript. They never reach any server. Verifiable in DevTools → Network tab.

What is the file size limit?

Up to 50MB per file. Very large files may take a few seconds on slower devices.

Does it work on mobile?

Yes — iPhone, Android, any browser. No app needed.

✓ Files stay in your browser for this tool

✓ Basic tools run in your browser

✓ No account required

✓ GDPR & CCPA compliant

✓ Verify in DevTools → Network

Unlock AI Chat, OCR, Summarize and unlimited processing for $5.99/mo.