Protect PDF Online — Free & Instant

Password protect PDF files online for free. AES-256 encryption. Secure your sensitive documents instantly.

🔒Protect PDF — Free, No Signup

How to protect pdf in 4 steps

Upload your PDF file
Set a password (you'll need this to open the file later)
Click "Protect PDF"
Download the encrypted, password-protected PDF

Why protect pdf your PDF?

Add password protection to sensitive documents before emailing or sharing. Prevents unauthorised access to contracts, medical records, financial documents, and confidential reports.

Tips for best results

Use a strong password — combine letters, numbers, and symbols
Store the password safely — PDFKit cannot recover it if lost
AES-256 encryption is used — the same standard as online banking

Related PDF tools

🔓Unlock PDF ✍️Sign PDF 💧Add Watermark 🚿Remove Watermark

Frequently asked questions

Is Protect PDF free to use?+

Yes. Protect PDF is free for files up to 25MB with up to 3 tasks per day. Upgrade to Pro for unlimited use.

Do I need to create an account?+

No account is needed for free tasks. Sign up to unlock more daily tasks and larger file sizes.

Is my file secure?+

All files are encrypted during transfer and automatically deleted 1 hour after processing. PDFKit never accesses your document content.

Does this work on mobile?+

Yes. PDFKit is fully optimised for iOS and Android browsers. No app download required.

🔒 HTTPS encrypted🕐 Files deleted in 60 minutes🚫 Never read by humans✅ Free, no signup required