How to set permanent Zoom factor in Visual Studio Editor 2012 tabs
Solution 1:
If you are simply zooming so the text in your editor is bigger, then why not just increase the font size?
Open TOOLS -> OPTIONS, under the 'Environment' tab select 'Fonts and Colors', and change the font size to whatever you want.
--edit--
As @Anovative pointed out in his comment and answer below, there is now a way to set default zoom within Visual Studio 2013 (and subsequent versions I'd assume).
Solution 2:
Go to Tools > Extensions and Updates > then get the extension
VSCommands for Visual Studio 2013 ...if you're using VS2013
Then Tools > VSCommands12 > General > click the button Open Configuration.
Then close out of the Options window and in the VSC - Config tab that should be open go to the Zoom option and set your default zoom level. This will apply to all editor tabs. You can still zoom in or out of individual tabs as desired. But your default zoom will be preserved even after closing VS and will be restored upon starting VS.
Solution 3:
This extension solve the problem http://visualstudiogallery.msdn.microsoft.com/71870f0e-87bb-4a5f-8abd-e8e5e0ccb900
Solution 4:
These tools do not solve the whole problem, but may help:
http://visualstudiogallery.msdn.microsoft.com/71870f0e-87bb-4a5f-8abd-e8e5e0ccb900?SRC=VSIDE
http://visualstudiogallery.msdn.microsoft.com/6a7a0b57-7059-470d-bcfa-60ceb78dc752/
Maybe this also helps: Visual Studio 2010 default zoom level
Considering this Default Zoom question, the whole problem is not solvable (for VS up to 2010) :-/. From my point of view this is a really missing feature.
Edit: Solve the Post from Aditya Patil the problem?