Shortcuts · Browser
Zoom in: the Mac and Windows shortcut
macOS
Command+=
Windows
Ctrl+=
What catches people out
It's the key marked + and =. No Shift needed. Zoom out is ⌘- or Ctrl+-, and ⌘0 or Ctrl+0 resets.
See it in the full table alongside 69 others, or search for the one you actually came for.