Protect PDF with Password

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僅支援 .pdf 格式，最大 100MB

Protect your PDF with a password online for free. Set an open password and permission restrictions with AES-128/RC4-128 encryption. Perfect for contracts, payrolls, and confidential documents.

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Use Cases

Contracts, quotes, or financial documents that need password protection before sending to clients
Internal materials, training documents, or electronic manuals that need permission restrictions
Important PDFs that you need to prevent from being freely copied, printed, or distributed
Need fine-grained permission control — set open password and permissions password separately

Features

Dual passwords: Open password (prevent viewing) + permissions password (prevent modification)
Granular permissions: Restrict printing, copying, annotations, and form filling
Bank-level encryption: AES-128/RC4-128 standard, secure and reliable
100% private: Everything runs locally in your browser, no server uploads

How to Use

1.Upload the PDF file you want to protect
2.Set the open password and optional permission restrictions
3.Confirm the password and permission rules and start encryption
4.Download the encrypted PDF and save the password securely

FAQ

What happens if I forget the password for an encrypted PDF?

Encryption is irreversible and we don't store any copies of your files. If you forget the password, it cannot be recovered. Please keep it in a safe place.

Can I open an encrypted PDF on my phone?

Yes. It uses the ISO standard and is compatible with Adobe, WPS, and most PDF readers. Just enter the password to view it.

Can I restrict printing and copying of the content?

Absolutely. You can set a permissions password to block printing, copying, and adding annotations — even if someone knows the open password.

Are my files uploaded to any server?

No. All processing happens locally in your browser. No files ever leave your device — complete privacy.