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It's already pretty easy to do this without Carbon -- at least on Windows.

1. Hit print screen on your keyboard

2. Select the rectangle area that you want to capture

3. Paste it into a tweet

You don't even need an intermediate image on your computer unless you wanted to crop it before sending it to Twitter.

You may also want to consider a step 0 which is to temporarily bump up the font size in your editor to make it more readable in a tweet.

Command+Shift+4 on mac. And on Ubuntu there was something too, but I’ve forgotten the combo

Shift+PrintScreen. It freezes the screen and lets you draw a rectangle over the area you want to capture.

> It freezes the screen and lets you draw a rectangle over the area you want to capture.

This is what Windows 10 does when you hit print screen on its own (as of a recent'ish update).

Then there's also:

alt + print screen to automatically capture the focused window.

And ctrl + print screen to capture all monitors instead of the focused window.