In github when you paste image from buffer it produces following markdown
![image](https://user-images.githubusercontent.com/folder/id.png)
Which is hard to resize because github doesn't support resizing like
![image](https://user-images.githubusercontent.com/folder/id.png){:class="img-responsive"}
![image](https://user-images.githubusercontent.com/folder/id.png){:height="50%" width="50%"}
![image](https://user-images.githubusercontent.com/folder/id.png){:height="700px" width="400px"}
The only way to resize image is to convert it manually to HTML
<img src="https://user-images.githubusercontent.com/folder/id.png" width=400 />
This tool helps to convert images to html tags