XLSXtoCSV
Convert XLSX to CSV
Up to 3 files at once, 100 with Pro. Mixed formats are fine.
CSV is what systems accept when they will not take a spreadsheet. This pulls the values out and leaves everything else behind.
The reason for doing this is nearly always a system on the other end: a database import, a script, an upload form, a tool that predates Excel formats. CSV is the plainest possible table — values, commas, line breaks — and its plainness is exactly why everything accepts it.
What that plainness costs is everything a spreadsheet does beyond holding values. Formatting, colours, column widths, frozen panes and cell comments have nowhere to go. Formulas are resolved to their calculated results, which is what an import wants. Merged cells contribute their value once and leave the remaining positions empty, which is worth checking if your sheet uses them for layout.
The limit to know before you start is sheets. A CSV holds one table and a workbook can hold twenty, so only the first sheet is converted. There is no honest alternative — concatenating several sheets into one file would produce something that looks like data and is not. If you need several, save them separately in the spreadsheet first.
This runs entirely in your browser. Spreadsheets are frequently the most sensitive files an organisation has, and there is no reason for one to travel anywhere to have its commas rearranged.
How to convert
- Drop your XLSX onto this page, or click to choose it.
- The first sheet is read and converted in your browser.
- Download the CSV.
What to expect
- Quality
- Nothing is lost. The result holds exactly the same picture, text or data as the original.
- Where it runs
- This conversion runs inside your browser. Your file is never uploaded, and it works with the network disconnected.
Questions
- Are my XLSX files uploaded anywhere?
- No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.
- What happens to a workbook with several sheets?
- Only the first is converted. A CSV holds one table, so there is no honest way to represent three sheets in one file — and silently concatenating them would corrupt the data rather than lose it.
- Are formulas included?
- You get the calculated values, not the formulas. That is almost always what an import wants.
- What about formatting, colours and merged cells?
- All gone. CSV holds values and nothing else — no fonts, no colours, no column widths. A merged cell contributes its value once and leaves the other positions empty.
- Does it run in my browser?
- Yes, entirely. The workbook is not uploaded, which matters when it contains a customer list or payroll data.