Question: I am using putty for remote login in Linux in Ubuntu. The font size of terminal is very small. How can I increase it's font size.

Answer: 
* Putty configuration
* Window
* Appearance
* Font Settings
* Font
* Change
* Size: pick the smallest one possible, which is 8 for me
* Go back to "Sessions", select a "saved session" and click "Save". Terrible interface design!
	+ <https://serverfault.com/questions/12295/how-to-make-putty-settings-persistent>
	+ <https://serverfault.com/questions/52068/is-there-a-way-to-permanently-set-the-font-and-window-size-in-putty>

I wish I could go even smaller a bit, but it is already a huge improvement.

Also consider using MobaXterm instead of Putty: [Can I access Ubuntu from Windows remotely?](https://askubuntu.com/questions/592537/can-i-access-ubuntu-from-windows-remotely/954989#954989) It is almost inevitable.

Tested on Putty 0.70, Windows 10 local, Ubuntu 16.04 remote.
The setup is somewhat different if you using Putty on Ubuntu.

Go to **Fonts** under **Window**, and change the **Font used for ordinary text**. Usually it's set to a default font by the server.

[![enter image description here](https://i.stack.imgur.com/Lq8DL.png)](https://i.stack.imgur.com/Lq8DL.png)

Here, you can select a font you want and update the preferred font size.

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