Chrome: any way to zoom a single page, not all pages in domain?

Just discovered that the issue linked by @Qtax in the comments above was marked "Wontfix" by the Chromium dev team a couple of years ago - they state that this behavior is by design, and they do not intent to provide per-page zoom. The extensions mentioned in other answers appear to be the only resolution for this issue.

I have read once that it is one of Chrome's disadvantages. However, there is an extension that may help you, called zoomWheel. You can find it here.

I was looking for this too and found an extension that's precisly for this. It's called Per Tab Zoom.

It lets you customize these 4 shortcuts:

Ctrl+Mouse wheel

Ctrl+Shift+Mouse wheel

Ctrl++/-

Ctrl+Shift++/-

For each one, you can choose what kind of zoom to perform, either per-tab zoom or per-domain zoom.

You can also disable some of the shortcuts if you don't want to use them.