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PST to MHT Converter

Convert the emails in an Outlook PST to MHT web archives — one self-contained file per message.

Your files never leave your device

How to convert PST to MHT

  1. 1

    Choose your PST 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.

MHT keeps each email’s formatting and inline images in a single file that opens in browsers and Word. Every message in the PST becomes its own .mht file; download them together as a ZIP.

Read the full guide with screenshots

What is PST?

PST (Personal Storage Table) is the file Outlook for Windows uses to store and archive email, contacts and calendars. Exports and backups from Outlook are usually PST files.

What is MHT?

MHT (MHTML) is a single-file web archive: an HTML page with its images packed in, which opens in browsers and Word.

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 pst to mht 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 PST files at once?

PST to MHT 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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PST to HTML

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Convert Outlook PST files to HTML pages that open in any browser, with headers and formatting kept.

PST to Text

PSTText

Extract plain text — headers and body — from Outlook PST files. Ideal for search, archiving and AI tools.

PST to JSON

PSTJSON

Convert Outlook PST files to structured JSON: headers, recipients, body and attachment details.

PST to CSV

PSTCSV

Export Outlook PST files to a CSV spreadsheet — one row per email with date, sender, subject and body.

PST to EML

PSTEML

Convert Outlook PST files to standard EML files that open in Thunderbird, Apple Mail and Outlook.