A Step-by-Step Guide to Deleting the Offline Gmail Cache Data

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You can access Gmail even when you're offline, and even unsend Gmail Offline messages. The way it works is by caching your data locally so that even without a connection, your last-downloaded mail will still load and give you a page to draft new messages.

While this is a great idea if you're using Gmail offline on your home computer or some other trusted device, it's not so great if you've left your cached Gmail messages on a public computer where somebody else could potentially read your personal information.

Fortunately, Google makes it really easy to clear your Gmail cache and get rid of these offline files once and for all. This includes any offline messages and attachments.

How to Remove Gmail Offline Cache Files

Here's how to remove your offline data saved by Gmail:

  1. Enter this into the navigation bar in Chrome: chrome://settings/siteData.

    The option here is to navigate there manually by opening the three-dot menu button from the top right of Chrome and then choosing Settings from that drop-down menu. Scroll down and click or tap Advanced and then Content settings from below that. Navigate to Cookies and then See all cookies and site data.

  2. When that page opens, let all the cookies and other site data fully load, and then hit the REMOVE ALL button at the top right.

    The next step will log you out of every website you're currently logged into, including Gmail. If you'd rather that not happen, you can remove just the mail.google.com data by opening this link instead of the one from Step 1.

  3. When prompted with the Clear site data window, choose the CLEAR ALL button to confirm that you want to remove all of the Gmail Offline data along with all of the other cookies stored in Chrome.

Another way to remove Gmail Offline data is to uninstall Gmail Offline altogether:

  1. Visit this page in the Chrome URL bar: chrome://apps

  2. Right-click or tap-and-hold the Gmail Offline option and choose to Remove from Chrome...

  3. Choose Remove when asked to confirm.