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OLM to HTML Converter

Convert Outlook for Mac OLM archives to HTML pages that open in any browser, with headers and formatting kept.

Your files never leave your device

How to convert OLM to HTML

  1. 1

    Choose your OLM 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 Outlook for Mac 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 OLM?

OLM is the archive format of Outlook for Mac (File → Export). It bundles email, contacts and calendars in a single file that Outlook for Windows and other apps can’t open.

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 olm 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 OLM files at once?

OLM 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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