A little mail.
Or a whole lot of it.
Use mbox-csv.com for everyday conversion. The premium mbox-csv.ai edition is being prepared for monthly subscriptions.
| What you get | Free · .com | Pro · .ai |
|---|---|---|
| Source files per conversion | Up to 1 GB | Up to 20 GB total |
| Files in one batch | 1 | Up to 200 |
| MBOX, MBX, and EML | Included | Included |
| Core columns and body text | Included | Included |
| On-screen preview | First 25 messages | First 100 messages |
| CSV / TSV downloads | Included | Included |
| Gmail thread IDs | Not included | Included when present |
| Attachment manifest | Not included | Included |
| Sender and date filters | Not included | Included |
| Duplicate Message ID removal | Not included | Included |
| Contact CSV and mailbox overview | Not included | Included |
| ZIP bundle | Not included | Included in standard mode |
| Direct-to-disk CSV | Not included | Supported desktop browsers |
| Email contents stay on device | Yes | Yes |
Pro is a monthly subscription.
Pro is currently a private owner preview. Subscription checkout, pricing, and renewals are not active, and subscriptions are not being sold. The preview lets the owner test the premium workspace before launch.
PRIVATE PREVIEW · NO PAYMENT REQUIREDWhat the limits mean
The 1 GB and 20 GB limits apply to the combined source files selected for one conversion. The 20 GB ceiling is a configured input limit, not a promise of identical performance on every device. Input is read in chunks. The large-file workflow needs supported desktop browser file access and sufficient storage.
Standard downloads are limited to 256 MB of main CSV output and a 64 MB attachment manifest. Pro can write the main CSV directly to disk instead. Individual messages have a 64 MB limit. Body text is capped at 32,000 characters per message in both editions.
Mailbox summaries are based on exported messages. Contact tracking is limited to 50,000 distinct addresses and sender tracking to 10,000 distinct senders. The converter reports when those tracking limits are reached.
About the .ai name
The current Pro preview offers premium archive-processing tools and local mailbox summaries. It does not claim to run AI extraction or send your messages to a model. An AI-powered feature would need its own clearly described behavior and data controls before launch.
Updated October 15, 2026