View > Appearance > Zoom In (Ctrl+=) - increase the Zoom level. View > Appearance > Zoom Out (Ctrl+-) - decrease the Zoom level. View > Appearance > Reset Zoom (Ctrl+Numpad0) - reset the Zoom level to 0.
Visual Studio provides commands—View. ZoomIn (Ctrl+Shift+.) and View. ZoomOut (Ctrl+Shift+,)—that increase and decrease the zoom level in various parts of the IDE.
To reset the zoom back to the default view, press and hold the Ctrl key and press the 0 (zero) key.
Go to TOOLS à Options à Environment à Fonts and Colours and change the Size field. Avani, Global Zoom Level extension lets you save zoom settings.
There is a select box for this at the bottom left of the editor window - choose 100% ;)
I was unable to find a keyboard shortcut for it, though zooming in and out can be done using Ctrl + > and Ctrl + <.
Please note the horizontal scroll bar must be turned on to see the zoom level.
Tools / Options / Text Editor / All Languages / Scroll Bars
Another option (Visual Studio 2013/2015) is to use Ctrl with the mouse wheel (up to zoom in, down to zoom out).
There's a zoom control in the bottom-left of the code editor. You can pick 100% from there, or type it by hand.
In Visual Studio 2015/2017/2019 (easy to miss if using a dark theme):
You can try VSCommands extension from Visual Studio Gallery, it adds several new features around zooming in VS2010
Visual Studio 2017 has an extension "Reset Zoom" by Mads Kristensen and it adds a keyboard shortcut (Ctrl+0, Ctrl+0). https://marketplace.visualstudio.com/items?itemName=MadsKristensen.ResetZoom
By default, the keyboard shortcut is Ctrl+0,Ctrl+0 but can be changed to be whatever you like.
I also have R# and the default shortcut did not show up for me but manually applying it worked.
Go to Tools -> Options -> Environment -> Keyboard and look for the command View.ZoomReset to change the keyboard shortcut.
In Visual Studio Ultimate 2013, at bottom-left from screen:
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