plainfolder → Mail → TGZ

Open a Google Takeout mail archive

Drop the archive Takeout handed you — .tgz, .tar.gz or .zip. The mbox inside is found on its own and the messages are listed, searchable and ready to export.

No server processing No account No daily limits

What a Google Takeout file is

Google Takeout hands your Gmail over as one archive with an mbox file inside it — every message you ever had, in a format built for mail programs rather than for people. Unpacking it gives you a single file of several gigabytes that Windows offers to open with Notepad, which is where most people stop.

The archive is usually downloaded at a moment when the account itself is about to go away: a job ending, a school address closing, a switch to another provider, or simply the decision to keep a copy while it is still possible. What follows is the awkward part — importing gigabytes into Thunderbird just to check whether an old message is in there, or handing the lot to a website that offers to read it for you.

What you can do here

Read and searchOpen the file, search by subject, address or text, filter by year, sender and attachment type.

Take things outSave every attachment as one zip, or the messages themselves as separate files.

Keep a copyCSV, XLSX, ZIP, EML, MBOX, PDF, HTML, TXT, JSON — whichever format outlives the one you have.

Convert Google Takeout to something else

TGZ→CSV

Questions

Which Takeout format works — .tgz or .zip?: Both. Takeout offers .zip and .tgz, and either can be dropped here as it downloaded. A .tar.gz is the same thing as a .tgz and works too.
Do I have to unpack the archive first?: No. The archive is opened here and the mbox inside it is found on its own, including the Takeout/Mail/ folders it sits in.
My Takeout came in several parts — what then?: Select all of them at once. Parts are read as one set, so the messages end up in a single list.
Is my mail uploaded anywhere?: No. The archive is read on your own computer and never leaves it — there is no server here to receive it.
How big an archive can I open?: Gigabyte archives open. Memory is the limit rather than file size, and the page says so in advance instead of freezing halfway.
Can I get just the attachments out?: Yes — every attachment in the archive, or only those matching a filter, saved as a single zip.