Mbox Viewer Pro

Mbox Viewer Pro is a native MBOX/EML reader for macOS. Back up your Gmail with Google Takeout and read it offline, or open a Thunderbird mailbox or an Apple Mail .mbox folder as it is — no import, no conversion, no account.

Why it belongs on your dock

• Handles any size — a streaming parser opens files from a few KB to 50+ GB without loading them into RAM.
• Instant re-opens — a binary index with SHA-256 validation re-opens any file in under a second.
• Powerful search — from:, to:, subject:, body:, date:, has:attachment, size:>, OR, negation and exact phrases.
• Gmail labels — read straight from Takeout, browsable in the sidebar with live counts.
• Conversation threads — JWZ threading algorithm.
• Full export — EML, CSV, plain text, MBOX selections, attachments, PDF and HTML; merge mailboxes with dedup.
• Repair damaged mailboxes (Pro) — deep-scan recovery that writes a repaired copy.
• Privacy first — 100% local, no cloud, no telemetry, strictly read-only.

Truly native: no Electron, no Java. Dark mode, drag & drop, system share and print. macOS 14+ on Apple Silicon (also available for Windows).

Pricing: free on the Mac App Store for mailboxes up to 1 GB — the whole app, no time limit or watermarks. Pro removes the size limit and adds batch export, repair and merge, as a one-time purchase or a yearly subscription.