Repair mojibake, broken UTF-8 sequences and stray control characters in CSV files exported from legacy systems — the é and ’ that survive a bad export.
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Mojibake is the garbled text you get when UTF-8 bytes are read as Latin-1: Müller turns into Müller and a curly apostrophe becomes ’. Encoding Fixer substitutes the common broken sequences back to the characters they should have been, in headers as well as cells.
The usual sources are a MySQL dump taken with the wrong client charset, an export from a legacy ERP or point-of-sale system, or text pasted out of Word with smart quotes intact. Two further switches clear up the rest of the mess: removing non-printable control characters that break downstream parsers, and collapsing runs of spaces, tabs and newlines into a single space.
Tick the fixes you want, run it, and compare the preview against the original before downloading.