Why a ZIP and not native PDF encryption?

True PDF password encryption requires either a server-side engine or a heavy WASM library; we don't believe in shipping a half-working browser version. A password-protected ZIP is a transparent, reliable alternative that recipients can open with standard tools.

How strong is the ZIP encryption?

JSZip uses traditional ZipCrypto, which is weaker than AES. Use a long, random password (12+ characters with mixed case, digits and symbols) and share it through a different channel than the file itself.

Can recipients open it without special software?

Most modern operating systems (Windows 10+, macOS, most Linux desktops) can extract password ZIPs natively. For maximum compatibility, recipients can use 7-Zip or WinRAR.

Does this change my PDF?

No. The PDF inside the ZIP is byte-for-byte identical to the one you uploaded. Only an outer ZIP wrapper is added.

Is the password sent anywhere?

No. ZIP encryption happens entirely in your browser via JSZip. The password never leaves your device — we have no server.

What if I need real PDF-level encryption?

Use a desktop tool such as qpdf, Adobe Acrobat or LibreOffice. For unlocking existing owner-password-restricted PDFs, try our Unlock PDF tool.

Protect PDF (ZIP)

Bundle your PDF into a password-protected ZIP — local.

100% private — no uploads PDF ToolsFree & unlimited Read tutorial

See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Protect PDF (ZIP)

Follow these steps — everything happens instantly in your browser.

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Step 1. Drop your PDF onto the zone.
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Step 2. Make sure “Password-protect the ZIP” is on and enter a strong password.
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Step 3. Click “Create protected ZIP” — the file is bundled locally and downloads.
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Step 4. Share the ZIP and the password through separate channels. Recipients extract with 7-Zip, WinRAR or macOS Finder.