Mbox Viewer Pro

Mbox Viewer Pro opens MBOX and EML files natively on your Mac. Fast, private, and account-free. Perfect for reading, searching and archiving email exports from Apple Mail, Thunderbird, Google Takeout, Gmail, Outlook and more.

Built for large archives • Opens files from a few KB to 50 GB and beyond. • Streaming parser: never loads the whole file into memory. • Scroll smoothly through hundreds of thousands of messages.

Powerful search • Instantly filter by sender, recipient, subject or date. • Full-text search inside message bodies. • Operators like from:, to:, subject:, body:, has:attachment, date:, size:.

Read like a mail app • Clean display of plain text and HTML messages. • Threaded view (grouped by conversation). • Preview and save attachments.

Privacy first • Fully offline — your email never leaves your Mac. • Remote images blocked by default (no tracking). • HTML is sanitized before display and JavaScript is disabled.

Export and convert • Save individual messages as EML. • Export to CSV or TXT. • Extract attachments. Merge MBOX files (with duplicate detection).

Free and Pro • Files up to 500 MB are free. • Pro unlocks unlimited file size.

Mbox Viewer Pro is read-only — your original files are never modified.

More tools • Export any message to PDF or a self-contained HTML file. • Extra message views: Properties, MIME structure and a Hex dump, plus a dedicated attachments gallery. • Recover damaged mailboxes and save a repaired copy to a new file — your original is never touched.