MBOX Viewer
Search and browse MBOX email archives from Thunderbird, Apple Mail, Gmail Takeout, and any other MBOX-compatible client, instantly, in your browser.
What is an MBOX file?
MBOX is an open, widely-supported email storage format used by Mozilla Thunderbird, Apple Mail, Gmail (via Google Takeout), Evolution, Eudora, and many other email clients. Unlike proprietary formats like PST or OST, MBOX is a plain-text format where individual email messages are concatenated into a single file. This makes MBOX files highly portable but also very large. A full Gmail export can easily be tens of gigabytes. Evermail handles MBOX files of any size and from any source.
Why use an online MBOX viewer instead of a desktop app?
Desktop MBOX viewers like Thunderbird require installation, profile configuration, and don't offer search across multiple archives. An online MBOX viewer lets you upload once and search your entire email history from any browser — no software to install, no file format conversion, and no storage limits on your local machine. Evermail adds AI-powered summaries and attachment search on top.
Access your MBOX archive from any device with a browser — Mac, Windows, Linux, or mobile. No installation, no profile setup.
Upload archives from different clients and search them all at once. Desktop tools are limited to one profile at a time.
Evermail summarizes long threads automatically. Desktop viewers show you raw email — you do the reading.
Find every email with a specific attachment type or filename across your entire archive in seconds.
How Evermail handles MBOX files
Upload once. Search forever. No conversion, no special software needed.
Upload your MBOX file from Thunderbird, Apple Mail, Gmail Takeout, or any other source. Single files up to 100 GB on Enterprise plans.
Evermail splits, parses, and indexes every message in the MBOX archive, including multi-part MIME messages, attachments, and headers.
Search across all messages with fast full-text search. Filter by sender, date, subject, attachment, or folder, and generate AI-assisted summaries when you need a recap.
Key features for MBOX archives
Thunderbird, Apple Mail, Gmail Takeout, Evolution, Eudora, Claws Mail: any MBOX file from any client is supported.
Generate concise summaries of long threads and emails, so you can catch up on a conversation without reading every message.
Search by attachment name or type. Find every email with a PDF, spreadsheet, or image attached, across your entire archive.
Thunderbird folders and Gmail labels are preserved after import so you can browse your archive just like the original.
Download any email as EML. Export filtered results as a new MBOX for migration or long-term archiving.
Your MBOX data is stored exclusively on EU infrastructure. Full GDPR compliance built in from day one.
Open your MBOX archive today
No special software. No conversion. Upload, index, and search. Free to start.
Get started free →Evermail vs desktop MBOX viewers
See how an online MBOX viewer compares to traditional desktop clients like Thunderbird.
| Feature | Evermail Online | Desktop Viewers |
|---|---|---|
| Installation required | No | Yes |
| Cross-device access | Yes | No |
| Full-text search | Yes | Limited |
| AI summaries | Yes | No |
| Handles 50+ GB archives | Yes | Rarely |
| GDPR compliant | Yes | Varies |