The fonts in the Typekit library include support for many different languages. You can filter for fonts that support a specific language (or combination of languages) from the Language Support section on http://typekit.com/fonts. Japanese fonts can be filtered using the Script button, and support various combinations of kanji and kana character sets, which are indicated on each family detail page.
Once you've selected the font(s) you want and added them to your kit, choose the appropriate character set for your website:
- Default character set: all the characters required for English, French, German, Italian, Portuguese, and Spanish.
- All Characters set: all the glyphs in the font files, including all of the supported languages for that font family.
- Language Subsetting: create a custom subset with the specific languages that you will be using on your website.
The OpenType Features checkbox adds any supported OpenType features to your kit; it can be used along with any of the Character Set options. Click the “?” icon to see which OpenType features your font includes; read more about Using OpenType features in CSS.
The Vertical Features checkbox adds the OpenType features to support vertical text in Japanese fonts.
Remember to republish your kit after making any changes.
Note that the Type Tester tool does not currently include the full Latin character set, so you will not be able to preview diacritics or other international characters on the Typekit website. These help pages list the minimum character set for each of the supported languages: