shortcutsguide

Mark as Read in Gmail (Shift+I)

Select one or more conversations, then press Shift+I to mark them as read. Press Shift+U to mark them unread. Keyboard shortcuts must be on.

ActionMacWindows
Mark as read ⇧I Shift+I
Mark as unread ⇧U Shift+U
Select a conversation x x

Clear the bold without opening the email

In your inbox, press x to select a conversation (or use the checkboxes), then press Shift+I to mark it read. This works the same on Mac and Windows because Gmail runs in the browser.

Turn Gmail shortcuts on first

These keys only work when shortcuts are enabled: Settings → See all settings → General → Keyboard shortcuts on → Save Changes.

FAQ

What is the mark as read shortcut in Gmail?

Select the conversations and press Shift+I. Shift+U marks them unread.

Why doesn't Shift+I do anything?

Gmail keyboard shortcuts must be turned on in Settings → General → Keyboard shortcuts.

Is the shortcut different on a Mac?

No — Gmail is a web app, so Shift+I works the same on Mac and Windows.