Google Fonts is a library of over 800 free and open fource fonts. Wordmark.it connects to Google's servers and fetches the fonts and displays them with your text. This makes it very convinient for you to choose the font that works best with your text.
Fonts in the Google Fonts catalog are published under licenses that allow you to use them on your projects, whether it’s commercial or personal. You can check the licences of the fonts in Google Fonts Font Attributions List
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