Pantone Color Manager This is the only "legal" way to get 99% accurate conversions. Pantone sells this software for ~$15/month or as a one-time purchase.
There is no single "free government database" of all TCX to HEX conversions, because Pantone holds strict copyright over their color formulas. However, here are the best ways to get the conversion. pantone tcx to hex converter
Some vibrant fabric dyes simply cannot be reproduced by the standard RGB colors used on the web. Pro Tips for Designers Pantone Color Manager This is the only "legal"
You might ask, "Can't I just use a standard color picker?" No. However, here are the best ways to get the conversion
When inputting HEX codes into design software, ensure your workspace is set to sRGB for the most "web-accurate" look.
A is a bridge across a physical and digital divide. It is a miracle of mathematics and color science, but it is not magic.