Double quotes always become single ones, but only with my own designed font

Hello everyone,

Double quotes always become single, but only with my own designed font and I just can’t find a setting before exporting to Glyphs 3 on a Mac with OS Sonoma that can fix this.

I would be very happy about a tip.

Greetings Jens

In which app is this happening? It might be a font caching issue. If you use Adobe apps to test your fonts, use the Adobe Fonts Folder to prevent caching issues:

Is this an interpolated instance? Can you check compatibility?

The problem only occurs with my font created in Glyps (Mac OS Sonoma in MS Office for Mac, Apple Mail, and so on). For example, you write… “Test”… and after the following space it becomes… ‘Test’… Since it doesn’t happen with Arial and other standard fonts, I assume that the setting before exporting from Glyphs is incorrect. Regarding the question of whether it is an interpolated instance, I have no idea how to set this up :-/ !?

Hello, the problem only occurs with my font created in Glyps (Mac OS Sonoma in MS Office for Mac, Apple Mail, and so on). For example, you write… “Test”… and after the following space it becomes… ‘Test’… Since it doesn’t happen with Arial and other standard fonts, I assume that the setting before exporting from Glyphs is incorrect. Regarding the question of whether it is an interpolated instance, I have no idea how to set this up :-/ !? Regards Jens

How are you exporting the font? Do you have multiple masters?

My guess is that, if the double quotes where automatically generated by glyphs from single quotes, two components might be overlapping (this sometimes happens when I generate my ellipsis!) If you can check how the double quotes glyph appear in you file

… yes I do export multiple masters …

…the double quotes were not automatically created by glyphs and look normal in all instances

can you enable “View > Show master compatibility” and post a screenshot the quote glyph?


… et voilà. What does the screenshot say to you …

this screenshot says that you do not have enough extreme points. You should add at least one extra node at the bottom and top curve.

… the font works perfectly except for the phenomenon described with the double quotes and when I press … CMD+Z … the double quotes are restored again after the automatic conversion to single quotes, so it’s probably a setting responsible for the export, such as the font ligatures from … f i to fi … but thanks anyway, I’ll definitely crack the nut at some point.

The screenshot tells me that you showed us your hungarumlaut rather than the quotes you claim cause an issue. In order to help you, please:

  1. Find out what the exact character stream is when you see the wrong quotes. Many apps replace quotes (usually dumb quotes for curly quotes). So, select and copy the affected text and paste it in the tool window of UnicodeChecker, in the split-up tool. Which Unicode is shown for the quote in question?
  2. Paste that quote in the edit view of your font and post a screenshot of the compatibility view of the glyph you see.

The most probably cause is an interpolation problem where the left shape is interpolating with the right shape. This is called shapeshifting. There is a mekkablue script called Find Shapeshifting Glyphs that will help you track down such issues.

… couldn’t see the forest for the trees. Your food for thought finally showed the way and the solution to the puzzle was: At some point I partially swapped the deposits (see before / after screenshots) and after correcting the cause everything is now fine. Thanks for the help and have a good time …


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Exactly what we suspected. See how the thin masters are blue on the left and green on the right. And the bolder masters the other way around: Multiple Masters, part 2: keeping your outlines compatible | Glyphs