Drop an .xlsx or .xls file and get a CSV. Runs entirely in your browser — nothing is uploaded. Your data never leaves your browser — no upload, no sign-up.
A free, private file converter that runs entirely in your browser. Nothing is uploaded to a server, so it works offline and your data stays on your device.
Other free converters: CSV → JSON, JSON → CSV. Or analyze a CSV / open the full workbench.