Convert XLSX to CSV
To convert XLSX to CSV, drop your Excel workbook into the converter on this page and press Convert to CSV. The first sheet is read and written out as comma-separated text in your browser, so the workbook never leaves your device.
Runs in your browser. Your file never leaves your device.Drop your XLSX hereChoose a XLSX to convert
It becomes a CSV right in your browser, up to 100 MB
Your file never leaves your device
Works in airplane mode. See the proof
Limits, published exactly
| Where it runs | In your browser. The file never leaves your device. |
|---|---|
| Free conversions | Unlimited. No account, no ads, no queue, no watermark. |
| Max file size, free | 100 MB |
Why convert XLSX to CSV?
Most data pipelines and scripts want the simplest possible input, and a .xlsx is anything but simple: it is a zipped bundle of XML with styling, formulas and multiple sheets. A database import, a command-line tool or a colleague on a different platform almost always prefers flat comma-separated values. Converting strips the workbook down to the values that matter so they drop straight into whatever reads them. It is the mirror image of dressing data up for a person; here you are handing the numbers to a machine.
What is XLSX?
XLSX is the Excel workbook format introduced with Office 2007: a zip archive of XML sheets, styles and formulas. It is the default container for tabular data in business, but a workbook is a living calculation, not a document, so layouts shift between Excel versions and alternative spreadsheet apps. Exporting to PDF pins the printed view of each sheet so the numbers land in front of the reader exactly once, exactly as formatted.
What is CSV?
CSV is the plainest way to store a table: one row per line, fields separated by commas, readable by every spreadsheet and database tool. It carries no formatting, formulas, or multiple sheets, which is exactly why it travels so well between programs. The tradeoff is that anything richer than a flat grid has to be flattened to fit.
Quality and what to expect
Only the first worksheet is exported, since a comma-separated file holds a single table. Formulas are written as their last computed results, and all styling, colors, merged cells and charts are dropped because the plain format cannot carry them. Dates and numbers are emitted in their displayed form. If the sheet has gaps or merged headers, the output reflects them literally, so a tidy source sheet gives the cleanest result.
XLSX to CSV FAQ
Which sheet gets exported?
The first sheet in the workbook. A comma-separated file represents one table, so other sheets are not included; reorder the workbook first if a different sheet should lead.
Do formulas survive?
Their results do, not the formulas themselves. A cell showing 42 from a SUM becomes the text 42 in the output, because the plain format has no concept of a formula.
Does my workbook get uploaded?
No. The .xlsx is parsed and the comma-separated file is written by code running in your browser, so the workbook never leaves your device.