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Differences between .ttf and .otf

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Since I'm a newbie in typography, I'm looking for a source (preferably a video) to understand the differences between .ttf and .otf files. I always thought OpenType features could only be implemented in .otf files (maybe due to the extension name), but I just realized in a .ttf file we could have contextual alternates and modified kernings.

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Ralf Herrmann

Long story short: the suffix doesn’t say much.

  • ttf is a font with TrueType outlines. It may or may not contain OpenType features.
  • otf is usually a font with PostScript outlines. It may or may not contain OpenType features. 
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