What encryption is used?

FileKit uses AES-256 encryption, the same standard used by banks and governments. It is currently considered unbreakable by brute force.

Can I set different passwords for viewing and editing?

Currently FileKit sets a single password that restricts opening the PDF. For separate owner/user password control, you would need a desktop tool like Adobe Acrobat.

What happens if I forget the password?

There is no way to recover the password. FileKit does not store your password anywhere. Make sure to keep it in a safe place.

Does my password leave my device?

No. The encryption happens entirely in your browser. Your password and file are never transmitted to any server.

What encryption level is used?

The tool uses AES-256 encryption, which is the strongest standard available for PDF files and is considered unbreakable with current technology.

Does password protection work on all PDF viewers?

Yes. AES-256 encrypted PDFs are supported by all major PDF readers including Adobe Acrobat, Preview, Chrome, and Edge.

Can I protect a PDF that is already password-protected?

You must unlock it first, then apply the new password. Stacking multiple passwords is not supported by the PDF standard.

Does protection prevent screenshots or screen recording?

No. PDF password protection controls opening, printing, and editing permissions. It cannot prevent screen captures, which are handled by the operating system.

Protect PDF

Your files never leave your device

FileKit — Free browser-based file tools. No upload, no signup.

Drop files here

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Max 500.0 MB per file·Supports: PDF

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🔓

Unlock PDF

Remove password protection from a PDF file

📄

Compress PDF

Reduce PDF file size — four levels including page rasterisation

🧩

Merge PDF

Combine multiple PDFs into a single file, in any order

How PDF protection works

FileKit uses strong AES-256 encryption to secure your PDF file. The password you enter is used to encrypt the document directly within your browser. We never see your password or your file, ensuring complete privacy.

How to Password-Protect a PDF

1
Upload your PDF
Drag and drop the PDF you want to protect. FileKit processes it locally — your file never leaves your device.
2
Set a password
Enter a strong password. FileKit uses AES-256 encryption, the same standard used in banking and government.
3
Download the encrypted PDF
Click protect to apply encryption. The resulting PDF requires the password to open. Store the password safely — there is no recovery option.

Frequently Asked Questions

Your Privacy, Guaranteed

FileKit processes every file directly in your browser using JavaScript and WebAssembly. Your documents, images, and data never leave your device — there is no server upload, no cloud storage, and no account required. What happens in your browser stays in your browser.

100% client-side processing
No server upload — ever
No account or signup needed
Works offline after first load

Protect PDF

You might also need

How PDF protection works

How to Password-Protect a PDF

Upload your PDF

Set a password

Download the encrypted PDF

Frequently Asked Questions

Your Privacy, Guaranteed

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