Add a .csv file to check if columns are separated by a semicolon (;) or a comma (,). If the file uses semicolons as a column delimiter, a new comma-separated CSV file will be downloaded.
This entirely happens in your browser with JavaScript - nothing is uploaded to any remote servers. You can find the source code here. Feel free to run locally and modify as needed.
Note: This tool replaces all semicolons with commas in the converted files.