Mbox Viewer
View and search exported mailboxes offline in your browser.
Inspect email archives, entirely local
Mbox Viewer by Cloud Captains is our free Chrome extension to read, search and export email archives without your data touching us or a server. Everything happens 100 percent offline in your browser. Supported: mbox, mbx and mbox.gz, eml and emlx, Maildir, and Outlook pst, ost and msg, including zip and tar.gz archives. You open Outlook pst and ost directly, with no conversion, keeping the folder structure, winmail.dat and embedded messages.
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New here? Start with getting started with Mbox Viewer and install the extension via cloud-captains.com/mbox-viewer.
The latest release is version 2.2.3 (August 2026): free, no ads, no trackers, in 22 languages.
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