Why use monospace fonts in your IDE?

6 Answers

I've never even considered coding in a proportional font before. So in the interests of science I just switched my editor over to give it a go.

Here are a few observations after fixing a couple of easy tickets:

  • Code seems extremely dense. Most of my code is around 80 columns, rarely over 100. A proportional fonts squishes it down to a tiny strip on the left hand side of my editor. Maybe useful if you're short screen space, but it seems unnecessarily compact.
  • The 'texture' of the code is lost. It's hard to tell what kind of structure I'm looking at - it's just a big slab of text that needs to be read almost character-by-character.
  • It's very easy to miss the ! operator in if (!foo). (if (!foo), see!)
  • Punctuation characters are very badly defined. Many are hard to tell apart ({}[]() vs {}[]())
  • Some punctuation characters are much larger than others, inferring emphasis where none is intended ($@% vs $@%)
  • Some characters are very narrow, and very hard to identify ('"!;:,. vs '"!;:,.)
  • Some numbers and letters are very similar (0Oo iIl vs 0Oo iIl)
  • I am extremely reliant on syntax highlighting, without it it's nearly impossible to do things like confirm quotes are balanced, etc.
  • Alignment (apart from simple indenting) is completely broken. You can sort of wing it by throwing in extra spaces, but because of the proportional nature of the fonts, the lines may not line up exactly - code looks messier.
  • Regular expressions are.. interesting!

There are some positive points, though. Admittedly I've only been using it for a little while, but there are certainly some aspects that work a little better with proportional fonts:

  • 'words' are easier to read - spelling errors (eg spelling a variable incorrectly) jump out at you.
  • I feel better about using longer, more descriptive variable names (maybe because they scan better, maybe because the horizontal size of the text is compressed)
  • It seems slightly easier to read code like this. It's easier for my brain to 'tokenise' each word and understand its meaning. Although because the punctuation characters are harder to read it's still hard going - but maybe that will change given a bit of time to get used to it

I'll update this answer again tomorrow (assuming I can make it through an entire day like this!)


I've seen a couple of font topics on SO and it seems a majority of people use monospace fonts for programming tasks. I have been using Verdana for programming for a couple of years and I really like the enhanced readability, without missing anything monospace related.

Why do you use a monospace font?

Mostly for alignment purposes (such as when function parameter declarations span multiple lines and you want to line them up, or lining up comments, etc.).

One thing I keep seeing in here is discussion of "lining up code" and indentation. I would like to point the following things out:

  • eight spaces will always be twice as long as four spaces in any font.
  • two tabs will always be twice as long as one tab in any font.
  • any identifier on one line will always be the same width on the next line...in any font!
  • sure, if your teammates are using monospace and you're not, it'll look different...but you should be standardizing on something--whatever it is--and if that's true then it'll look the same for everyone...in ANY font! For laughs you could also try keeping everyone on monospace and giving half of them widescreen monitors...see how that goes.
  • If you're doing anything that relies on lining up code based on the columnar position of those characters on the screen, and not the scope of the identifiers you're using, I pose that what you're doing is a hack. Identifiers should never be constrained to a certain number of characters at the cost of the quality of their names. Aside from that...you're not still drawing ASCII boxes with asterisks for comments in your code, are you?

So drawing all of this together, if you start each line at the same place, and consistent spacing is the same width, and the identifiers don't spontaneously change width on each line, then your code actually WILL line up! ...until something is different.

for example:

identifier.Method().OtherGuy.ToString(); //how lined up and pretty!
  • identifier.Method().Property.ToString();
  • identifier.Method().OtherGuy.ToString(); //oh no! misaligned!
  • identifier.Method().Sumthing.YouGetThePoint; //...but who cares? they're different properties!

The one point I'll concede is that non-alphanumeric characters are typically not very wide; these include )(][}{,:|";',`! and . This however could be fixed in a font editor...simply by making them wider. It's not a problem inherent with non-monospace; there just hasn't been a lot of demand for it, and so it hasn't been done yet.

In summary, personal preference is fine, but I think there's little practical reason to prefer monospace over non-monospace. You like the look of it? Sure, do monospace. You want more stuff to fit on your screen? Go non-mono. But the way people treat non-monospace like heresy is a little overblown.

All it takes is a few hours of trying to figure out why a search isn't finding something because you have 2 spaces instead of 1 in your literal, to realize you should use Monospace fonts. I had this happen to me once when trying to fix a Lotus Notes agent, when the designer wasn't using a monospace font. It wasn't until I pasted the code into CodeWright to print it out that it was obvious what the problem was.

I suspect monospaced fonts were a programmer's preference as a carry-over from the text-based DOS days.

On the other hand, I, myself, have tried Verdana and a couple other recommended proportional fonts, but I couldn't deal with the change. My eye is too well trained for monospace. Languages heavy on symbols, like: C/C++, C#, Perl, etc., look too different for me. The placement of symbols makes the code look completely different.

If you work in a team then mono-spaced fonts ensure that code is clear and correctly layed out for everyone, whatever mono-spaced font they prefer to use.

Your code may look clear to you when using a variable width font but it's unlikely to look the same if a mono-spaced font user opens it.

I personally find the mono-spaced fonts easier to read in code editors. Of course, I'm almost blind. That might make a difference. I currently run consolas font at 15 point with a dark background with high-contrast letters.