Several websites offer free TTC to TTF conversion. This is fast, but you should to a third-party server.
Online tools are the fastest option if you only have a few files to convert and do not want to install software. 1. CloudConvert
Do not convert commercial TTC files you haven't licensed. Furthermore, converting a TTC to TTF technically "flattens" the collection. You will lose the collection structure, but you gain a usable font.
The most trusted, free, and open-source tool is ttc2ttf . It extracts each font from the collection without quality loss.
One of the easiest ways to convert a TTC font to TTF is by using online conversion tools. These tools allow you to upload your TTC file and download the converted TTF file. Some popular online conversion tools include:
If you are uncomfortable uploading fonts to a third-party server—which can sometimes violate font licenses—offline software is the professional choice.