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.