Is there a website for generating xíngshū (semi-cursive script) from jiǎnhuàzì (simplified characters)? Google Translate can be a useful tool for converting Simplified Chinese hanzi into Traditional Chinese — but I'm looking for a tool that will enable me to paste in a set of Simplified characters, and generate a calligraphic equivalent in semi-cursive script.

Is there a web service that does this, or would it be better to download a xíngshū font?
You can try 第一字体网

Choose any 行书 fonts.

You can download the font too.