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Paste a CSV or open the file, then do the job at hand: preview it, keep and reorder columns, drop duplicate rows, sort, transpose, split it into smaller files or merge several into one. One RFC 4180 parser underneath, so quoted commas and line breaks survive — and values stay text, so postal codes and leading zeros do too.
Paste a CSV, or open a .csv file.
Everything happens in this tab — nothing is uploaded, and closing the page discards it all. Cells are treated as text from start to finish, never coerced to numbers, so postal codes, part numbers and leading zeros survive untouched. Merge appends rows as they are; it doesn’t reconcile files whose columns differ.
Paste into the editor or open a file — everything you add stays in this tab, and you see exactly what the tool will work on before anything runs.
Your browser does all the work locally. Nothing is uploaded — what you paste never leaves this tab, so there’s nothing for anyone to store, scan, or leak.
Take the result to your clipboard, or save it as a file. Close the tab and nothing of what you pasted remains.