Way to mass delete in Gmail?

[Uncoolsby]

Does anybody how to mark your entire Gmail inbox as read? I have a bunch of old emails from years ago that never synced with my phone, which I've only had a couple of months, so despite keeping up with the inbox and marking as read/deleting, my inbox constantly sits at 99+ unread messages. There's 430 emails according to Gmail.com and that's a LOT of individual marking to have to do.

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[Crashdamage]

You need to do it online, using a browser. If you don't have a computer the phone's browser will do.