Open your MBOX file online — read, search, convert to PDF or CSV
- Read & search any .mbox export — Gmail Takeout, Thunderbird, multi-GB files OK
- Export the message list to CSV free, or merge whole mailboxes into one searchable PDF
- Private by design — parsed locally in your browser, your file never leaves your device
Drag & drop your .mbox file here
or
Your file never leaves your device — everything is parsed locally in your browser.
Messages
License active ✓ Keep this key to yourself — abnormal usage will get it deactivated.| # | Date | From | Subject | Size | Att. |
|---|
Message
- From
- To
- Cc
- Date
Attachments
How it works
Drop your .mbox file
The file is read in small chunks with the browser's File API and indexed on the fly — multi-GB Gmail Takeout exports work. Nothing is uploaded, ever.
Browse & search
A fast paginated table lists every message (date, sender, subject, size, attachments). Search filters instantly; click any row to read the full message and download its attachments.
Export
Export the metadata as CSV for free, or unlock the merged PDF export (all, search results, or selected messages) with a license — one-time, from $9.99.
Simple pricing
Everything essential is free. Licenses are one-time: $9.99 for 90 days or $19.99 forever.
Free
$0
- Open mbox files of any size
- Read every message, download attachments
- Instant search over From / To / Subject
- CSV metadata export — no account, no upload
3-month license
$9.99 one-time · 90 days
- Merged PDF export of whole mailboxes
- Scope: all, search results, or selected messages
- One key unlocks every tool on this site — all 7 tools.
- All of it for 90 days — nothing to cancel
By purchasing you agree to the Terms of Service and Privacy Policy. Full refund within 14 days if it can't handle your file.
Lifetime license
$19.99 one-time · forever
- Merged PDF export of whole mailboxes
- Scope: all, search results, or selected messages
- One key unlocks every tool on this site — all 7 tools.
- Export up to 10,000 messages per batch
- All of it, forever — nothing to cancel
- Support a small independent tool
By purchasing you agree to the Terms of Service and Privacy Policy. Full refund within 14 days if it can't handle your file.
Frequently asked questions
What is an MBOX file?
MBOX is the classic plain-text mailbox format: many email messages concatenated into one file,
each starting with a "From " separator line. Gmail (via Google Takeout), Thunderbird, Apple Mail,
and most Unix mail tools can export it. Files usually have a .mbox extension.
How do I open an MBOX file without installing anything?
Right here: drag the file into the box above (or click "Choose .mbox file"). The whole mailbox is indexed in your browser tab and you can read, search, and export immediately — no email client, no account, no upload.
How do I export my Gmail to MBOX?
Use Google Takeout: go to takeout.google.com, deselect everything, select only
Mail, and export. Google emails you a download link; unzip the archive and drop the
.mbox file here. See the step-by-step Google Takeout
guide for details.
Is it safe to open my mailbox here?
Yes — by construction. The file is read and parsed entirely by JavaScript running in your browser; it is never transmitted. You can verify this yourself: open your browser's developer tools (Network tab), load the file, and watch — no file bytes are sent anywhere. The only requests this site makes are page loads, an anonymous usage counter (counts only, never content), and license validation for paid users. Details in the privacy policy.
What's free and what costs money?
Free, forever: opening files of any size, reading every message, downloading attachments, search, and CSV metadata export. A license unlocks the merged PDF export (whole mailbox, search results, or selected messages): $9.99 for 90 days or $19.99 lifetime — one-time payments, no subscription.
How big a file can it handle?
The indexer streams the file in 2 MB chunks and keeps only per-message metadata in memory, so multi-gigabyte exports (typical for years of Gmail) work fine. A progress bar shows how far along the indexing is.
Can I import the MBOX into Thunderbird instead?
Sure — Thunderbird with the free ImportExportTools NG add-on does that well. See the Thunderbird import guide. If you just want to look inside the file without installing software, this page is faster.
I already paid but lost my license key — what do I do?
Your key is shown on your Gumroad receipt, emailed to you right after checkout — search your inbox for "Gumroad" and open the receipt to copy it. Then click "Enter license key" in the top navigation to re-activate PDF export.