mboxviewer

mbox to HTML,
locally or online.

Convert .mbox to a searchable HTML viewer.
Download Desktop app or CLI tool for local processing.

Privacy-firstKeeps attachmentsOpen source

Drop .mbox files here

or browse files · up to 150 MB

Desktop & CLI

Desktop and CLI versions are coming soon.

Coming soon

macOS

Apple Silicon + Intel

Download
Coming soon

Windows

x64

Download

The CLI version will be available soon.

Coming soon

mbox-viewer-cli

Python · pip install

How to get an .mbox file

Gmail

.mbox via Google Takeout

Open Google Takeout, export only Mail, then unzip the archive. Your mailbox is usually inside Takeout/Mail as one or more .mbox files.

Google Takeout guide

Apple Mail / iCloud Mail

.mbox from Mail on Mac

If your account is synced in Apple Mail, select the mailbox and use Mailbox > Export Mailbox. Mail saves it as an .mbox package you can open locally.

Apple Mail export guide

Proton Mail

.mbox with the Import-Export app

Use Proton's Import-Export app to download mail locally. It supports MBOX export for full mailbox backups.

Proton Mail export guide

Outlook / Microsoft 365

.pst first, then convert to .mbox

Microsoft's official export gives you a .pst file, not .mbox. If you need .mbox, export the mailbox first, then re-export it with a client such as Apple Mail or Thunderbird.

Outlook export guide

How it works (Web)

Let's be real: the web version is sh*t. It's not meant for large archives or sensitive data.
But if you just want to peek inside an .mbox file, it's nice. Nothing new but at least this sh*t is Open Source.

01

Upload

Drop one or more .mbox files from Gmail, Thunderbird, Apple Mail, or any RFC 4155-compliant client.

02

Parse

Messages are parsed in memory; headers decoded, MIME parts extracted, attachments embedded as data URIs.

03

Download

You get a single .html file. Open it offline in any browser, with full search, sort, and attachment access.

Local-first privacy

For maximum privacy, use the desktop app or CLI tool to process files entirely on your machine. No internet required, no data sent anywhere. Your emails stay under your complete control.

Fully offline

No internet, no uploads, complete privacy.

No size limits

Process archives of any size.

100% local

No uploads, files stay on your machine.

Scriptable

Batch processing and automation.