I’m always trying to find the optimal line length for my text. After reading several posts, I found that the sweet spot is around 66 characters. While styling my paragraphs I started counting the characters manually. That got old, real fast.
So I created this little tool. Copy a paragraph and paste it into the box. It will automatically highlight the 66th character. You can adjust the character length to get a better feel for your readability. It will also tell you the width of the container to help you adjust your own CSS.
Line Length-icator is also served on its own page.