Question: I'm using Parallels on my mac. But when I open a software the font are so small, it's very weird. Can anyone help me out!!!

![The tool bar of chrome is so small](https://i.stack.imgur.com/zgQM4.png)

The picture above is when I open up my chrome, how can I fix it?

Answer: 
I've seen this particular problem many times, and a lot of it has to do with how Windows handles DPI scaling.

Since you are using a Retina MBP - which has an extremely high resolution, you'll want Parallels to manage the DPI of your Windows VM. You can do this under your Virtual Machine's configuration, Hardware, Video Options, and select "Best for Retina".

![enter image description here](https://i.stack.imgur.com/xYlLf.png)

The next time you reboot, Windows will have its DPI set to 199% (why not 200% I'm not sure).

The only trick to this is when you connect to an external display and you want to show your Parallels VM there. Windows can't change it's DPI without a full logout / login - so if you change displays you'll have to log out of Windows and log back in.

The next problem is that Windows does DPI scaling differently - *some programs do not respect Windows DPI scaling*. It's very bad practices for developers, but some of them always assume a fixed number of points-per-inch, like 96. Windows does its best to fix these issues by bitmap scaling the Window, and translating input, but it won't ever be perfect and it will look like a JPG that's 200% zoomed. It all depends on the program you are using. As unfortunate as it sounds, the best browser on Windows for retina resolution / DPI is Internet Explorer 10.
I had the exact same problem. I went a different route, and decided to sacrifice the nice high-DPI of the Retina for a scaled solution that makes everything look right.

1. In Parallels VM Config → Hardware → Video → Resolution

Use: **Scaled**  

Not: Best for Retina, More Space
2. Restart VM
3. Windows Display Settings → Set Resolution: **1280x800** + Apply
4. Windows Display Settings → "Make text and other items larger or smaller"

Use: Smaller (100%)

Late-2013 rMBP 13.3″ with Parallels 9.0.23350 and Windows 7