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Password Protect PDF

Encrypt a PDF with a password using AES-256. Optionally block printing and copying. Nothing is uploaded.

Your files never leave your device

How to password protect pdf

  1. 1

    Choose your PDF files

    Click the upload area or drag files onto it. Nothing is uploaded — files are opened locally.

  2. 2

    Adjust the settings

    Pick password and restrictions, then press the convert button.

  3. 3

    Download the result

    Save each file individually or everything at once as a ZIP.

Lock contracts, statements and medical records before emailing them. The PDF is encrypted with AES-256 — the strongest standard PDF encryption — and can only be opened with your password. Because it happens in your browser, the password and the file never touch our servers.

Read the full guide with screenshots

What is PDF?

PDF (Portable Document Format) preserves a document’s layout on every device and operating system, which makes it the standard for sharing, printing and archiving.

Is it private?

Yes. Unlike upload-based converters, ZapMorph processes files inside your browser tab, so the file stays on your device. It is never transmitted, stored or logged — close the tab and it’s gone.

Frequently asked questions

Is the password protect pdf converter free?

Yes. Convert 1 file a day without an account, or 5 files a day with a free account. Pro removes all daily limits.

Are my files uploaded to a server?

No. The conversion runs entirely in your browser, so your files never leave your device. We only count how many files you convert — never their names or contents.

What is the maximum file size?

Up to 25 MB per file without an account, 50 MB with a free account, and 1 GB on Pro. Very large files also depend on your device’s memory.

Can I convert multiple PDF files at once?

Yes. Select several PDF files at once — up to 5 on the free plan or 50 on Pro — and download all results in a single ZIP.

Does it work on Mac, Windows, iPhone and Android?

Yes. It works in any modern browser — Chrome, Edge, Firefox and Safari — on desktop and mobile, with nothing to install.

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