Защитете PDF с парола — безплатно

How to Password Protect a PDF

Upload your PDF

Drag and drop your PDF file or click to select it from your device. Your file stays in your browser — nothing is uploaded to any server.

Set a password

Enter the password you want to use to protect the PDF. Anyone who wants to open the file will need this password.

Download your protected PDF

Click "Protect PDF" and download the encrypted file. The original file remains unchanged.

Why use FyleTools to protect your PDF?

100% Private

Your files never leave your device. All encryption happens in your browser using WebAssembly — no server uploads, no third-party access.

Free & Unlimited

No registration, no file limits, no watermarks. Protect as many PDFs as you need, completely free.

Universal Compatibility

Protected PDFs work with all major readers including standard PDF readers, Chrome, Firefox, Edge, and Preview on Mac.

Frequently Asked Questions

Is my PDF uploaded to a server?

No. FyleTools processes everything directly in your browser using WebAssembly technology. Your file never leaves your device, making it completely safe for sensitive documents.

What type of encryption is used?

FyleTools uses standard PDF password encryption (RC4, 40-bit), which is compatible with all PDF readers. This prevents unauthorized users from opening the file without the password.

Can I remove the password later?

Yes. Use our Unlock PDF tool with the same password to remove the protection and get an unencrypted version of your document.

Is there a file size limit?

There is no fixed limit. Since processing happens entirely in your browser, the maximum file size depends on your device's available memory. Most devices handle files up to 100 MB without issues.

How strong is the password protection?

The PDF is encrypted so that opening the file requires the exact password you set. Use a strong, unique password for maximum security.

Does this work on my phone?

Yes. The tool runs entirely in your browser on any device. Your PDF and password never leave your device.

Can I protect multiple PDFs at once?

Currently the tool protects one PDF at a time. Upload each file individually to apply password protection.