FontTools can be used directly to extract fonts from a TTC container using a simple Python script:

If your newly generated TTF files show corrupted shapes or missing symbols, the original TTC file likely used PostScript outlines (OpenType-CFF architecture packed inside a TTC container). If this occurs, try setting your conversion output destination format to (OpenType Font) instead of TTF. This preserves the original mathematical curves without forcing a destructive translation. Missing Font Styles in Windows

Also, if you have a lot of fonts, I can tell you about a tool that them all at once.

Or with the classic BREAKTTC utility:

For those comfortable with the command line or Python, FontTools provides precise control over the conversion process.

If you only need to convert one or two files and do not want to install software, online converters are the fastest option.

Click the process button to let the system analyze the internal table indices.

This extracts every font from the collection into clean, working TTF files. This method preserves 100% of the hinting and glyph data.

A TTC file uses a followed by TableDirectory for each font, pointing to shared tables. A TTF file expects a single Offset Table at the start.