XLSX to CSV converter
A free XLSX to CSV converter for Office Open XML Spreadsheet files. Browser-based pairs here usually run in this tab, with no file upload.
Drop your XLSX files here
or browse your device · paste with Ctrl+V
Accepts .xlsx, .xlsm files. You can queue several files; each is processed one after another on your own device.
Your files never leave this device — there is no upload and no server to delete them from.
- 01
Add your XLSX files
Drop them onto the box above or click to browse. They are read straight from disk — nothing is sent anywhere.
- 02
Check the settings
CSV is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
Download your CSV
Press convert and wait for the row to finish. Convert several files and you can take them all as a single ZIP.
XLSX
Office Open XML SpreadsheetExcel's modern workbook format, holding multiple sheets, formulas, formatting and charts as zipped XML. The de facto standard for exchanging tabular data in business.
- Developed by
- Microsoft / ECMA
- Released
- 2007
- Extension
- .xlsx, .xlsm
- MIME type
- application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
- Compression
- Lossless
- Specification
- Open
CSV
Comma-Separated ValuesOne row per line, values separated by commas, and no formatting whatsoever. Every database, spreadsheet and analytics tool on earth imports it — which is why it remains the universal joint of data work.
- Released
- 1972
- Extension
- .csv, .tsv
- MIME type
- text/csv
- Compression
- Uncompressed
- Specification
- Open
- CSV holds one sheet of plain values — formulas, formatting and any extra sheets in the XLSX file do not carry over.
Questions about converting XLSX to CSV
Is this XLSX to CSV converter free?
Yes. Converting XLSX to CSV here is free, with no account, no watermark and no daily quota. The work runs on your own device, so there is no server cost to pass on to you.
Is my XLSX file uploaded anywhere?
For browser-based pairs, your file is read locally and converted by SheetJS in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.
Is there a file-size limit for XLSX to CSV?
There is no imposed upload cap when it runs in-browser, but each conversion still depends on your device and browser memory. Large videos are the first practical limit, then memory-heavy documents or images.
Can I convert several XLSX files to CSV at once?
Yes. Drop in several files and each gets its own row; they are processed one after another on your device. You can download them one by one or as one ZIP.
Does XLSX to CSV work on a phone, Mac or Chromebook?
Most modern browsers on Windows, macOS, Linux, ChromeOS, Android and iOS work. Very large videos are often more reliable on desktop or a browser with more memory.
Why do some conversions take longer on first run?
The conversion engine has to download first. Small codec bundles are fast, while ffmpeg is commonly 12–30 MB; later conversions of similar type use the cached engine.
I converted a file and the output is blank or unusable. What should I check?
Start over with default settings, then change one option at a time (quality, bitrate, page size, or codec) to isolate what changed behavior. If it keeps failing, retry with a smaller file and confirm the source format matches the pair.
Convert other formats to CSV
4 formats can become CSV here.
Convert XLSX to other formats
A XLSX file can become any of these.
CSV to XLSX
The reverse conversion
XLSX to TXT
XLSX to HTML
HTML to CSV
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