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OpalCSV Converter is very easy to use, yet powerful. Simply open a file (or copy/paste into the left white panel), select a format to convert from (e.g.: CSV is chosen below), select an output format, and save the file (save button will turn green).

As you change the options (for example, the CSV delimiter here), the output will update immediately in realtime. This allows you to have instant feedback to see if the conversion results match your expectations. It's much more intuitive than saving a hundred times to check your results. Batch conversion (for multiple files) is featured too.

Features include:

Convert from and to CSV, HTML (table), and programmer 2D array
Extensive customization, including filtering and transposition of data
Very easy to use GUI
Realtime updating of output when changing options
Batch conversion for multiple files
Preferences are saved and can be set to defaults with a button click