Using this program!
credit to @CardZlol for some of these tips
Only use images with 1 color.
Set Number of bits per color to the smallest amount, and disable underlines.
Remove all color tags, like <#000> or <#FFF>. This will make the text paintable, and will remove glitchy colors.
You can press Ctrl+f to find text easier
Use "Anita Semi Square" font
Don't use "Military" font as the site says.
Set the width & height of the text label to appropriate measures. It should be the width and height of the image divided by 10, although more might be necesary.
for example, this image has a width of 300 pixels, so I set the text width to 32 because 30 wasn't enough.
You can adjust "mspace" and "lineheight" values to adjust the image. Default values are 1.
Here's a great example from CardZ!
You can also select a background colour in the website by inputting its hex code. This will cut down character count by several times and means you can make higher quality images