MBOX Viewer
MBOX Viewer is a browser-based tool for opening, reading, and exporting MBOX email archive files, the format used by Thunderbird, Apple Mail, Google Takeout, and many other mail clients. All processing happens locally in the user's browser, so email data is never uploaded to a remote server, which makes it suitable for reviewing sensitive or confidential mailboxes. The tool loads MBOX files directly from the local disk and displays them in a two-pane layout for browsing individual messages. Users can search by sender or subject and narrow results to a specific date range to quickly locate relevant email. MBOX Viewer is built to handle very large archives, including files of 10 GB or more, without requiring the file to be uploaded or split. Matching messages can be exported individually or in bulk to several formats, including CSV, PDF, EML, MBOX, and ZIP, with support for extracting attachments in batch. The free tier supports basic reading and single-message export; a one-time payment of $29 unlocks unlimited file size, bulk exports in all formats, and batch attachment extraction, with no recurring subscription. MBOX Viewer requires no installation, signup, or account, and runs in desktop browsers, with Chrome or Edge recommended for best performance.