CSV ⇄ Excel
A CSV that Excel opens badly, or a sheet you need a clean table out of: the conversion happens here, in your browser, and the file you choose decides the direction.
Your file stays on your device: nothing is uploaded
How it works
CSV to sheet: the separator is found by trying to read the file with each candidate rather than counting occurrences — an Italian file separated by semicolons contains more commas than separators, all inside quoted fields. Cells become numbers only when converting them back would give exactly the original text: a postcode like 06121, a phone number with a leading plus and a thirteen-digit barcode stay text, because otherwise they would come back changed. Sheet to CSV: one sheet at a time — a CSV is a single table — and cells go where they say they go, not in the order they are written: in a sheet saved by Excel the empty cells are simply absent, and stacking them would slide a whole column under the wrong heading. Dates, which in a spreadsheet are numbers, come out readable. The CSV carries the mark Excel expects, so accents survive a double click. What does not come through: formulas (the value comes out, which is what you see), formatting, charts, merged cells, and the old .xls and .xlsb formats.
Your files are never uploaded. Anywhere.
Not to a server of ours, not to a third party, never. When you pick a file it stays in your browser’s memory: it is read, processed and written back on your device, and you save the result yourself. There is no path that takes it elsewhere, because there is no server to send it to.
- Processed locallyFormats are handled by WebAssembly code running in your browser, not by a remote service.
- Nothing to upload, nothing to wait forOther services send your file to a server and then send it back to you. Here the file never leaves: there is no upload to wait for.
- No accountNo sign-up, no email, no daily limits to get around by paying.
- No files to deleteOthers promise to erase your files after an hour. We have nothing to erase: they never reached us.