Convert XLSX files to CSV free in your browser — no signup, no install, and the file is never uploaded to a server. CSV opens almost anywhere, so the result works where XLSX did not.
Add your XLSX file
Drag the XLSX file onto the drop area above, or click it to pick a file from your device. You can add several files at once.
Confirm CSV as the output
CSV is already selected as the output format on this page. Only the options this format actually supports show up, such as a page range or sheet selection.
Run the conversion
Press the convert button. Processing happens on your own device, so the time depends on your computer rather than a server queue.
Download the CSV file
When it finishes, download the CSV file. Converting multiple files gives you the option to download them together as a ZIP.
Microsoft Excel's standard format, preserving formulas, charts, multiple sheets, and formatting. Internally it is a zip archive of XML.
The simplest tabular format: one row per line, columns separated by commas. Every program and language can read it, making it the lingua franca of data exchange.
Yes. XLSX to CSV conversion is completely free with no signup, no watermark, and no daily limit on the free plan for ordinary use.
No. The conversion runs entirely inside your browser using WebAssembly, so the XLSX file never leaves your device. That is also why it works without an internet connection once the page has loaded.
CSV is a plain text format — it stores characters only. Images, tables, fonts and page layout from the XLSX file cannot be represented and are dropped.
It can go either way. Both formats are lossless, so nothing is thrown away — the size difference comes from how each one packs the same data.
The free plan handles files up to 200MB. Because processing happens on your own device, very large files depend on your computer's memory rather than a server quota.
Spreadsheet converter
What each file format is, what it is used for, and which formats it can be converted to.
Open converter Browse the full format reference