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MBOX to HTML Converter

Convert MBOX mailboxes to HTML pages that open in any browser, with headers and formatting kept.

Your files never leave your device

How to convert MBOX to HTML

  1. 1

    Choose your MBOX file

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

  2. 2

    Start the conversion

    Press the convert button. Your browser converts the files in seconds.

  3. 3

    Download the result

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

Read emails from Gmail Takeout, Thunderbird and Apple Mail without the original app. The HTML body is kept as sent, with a header block on top; plain-text emails are wrapped so they stay readable.

Read the full guide with screenshots

What is MBOX?

MBOX stores a whole mailbox — thousands of emails — in one file. Google Takeout, Thunderbird and Apple Mail exports all use it.

What is HTML?

HTML is the markup language of web pages. Converting to or from HTML lets you publish content online or bring web content into other tools.

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 mbox to html 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 MBOX files at once?

MBOX to HTML Converter works on one file at a time and can produce many output files, which you can download together as a 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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