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convertexa

XLSX → CSV

XLSX to CSV converter

convertexa converts XLSX files to CSV locally in your browser using a dedicated data engine. Nothing is uploaded: the file is read, converted and handed straight back to you as a download.

  • Free, no sign-up
  • Nothing is uploaded
  • Works offline
Quality
Re-encoded
Runs
In your browser
Max input
25 MB
Status
stable

Drop a file to convert

Everything happens on your device — nothing is uploaded.

or paste with Ctrl+V

How to convert XLSX to CSV

  1. 1 Drop your workbook here.
  2. 2 Choose the output format.
  3. 3 Convert and download the result.

About XLSX and CSV

XLSX workbooks are read and written with ExcelJS.

CSV is plain text; the first row is treated as the header.

XLSX files are read by the convertexa engine that ships with this page, so the conversion is identical whether you use this tool or the general converter. The output is produced with the same codec settings for every visitor, which means the same input always produces the same result.

Limitations

  • Only the first worksheet is exported, because CSV cannot hold more than one table.

Frequently asked questions

How do I convert a XLSX file to CSV?

Add your XLSX file to the box above. convertexa detects the format from the file content, applies the XLSX to CSV conversion and gives you the result to download. The whole operation runs inside your browser.

Are my XLSX files uploaded anywhere?

No. The conversion runs in a sandboxed worker on your own device. Your file never leaves the browser, and nothing is stored on a server.

Is the XLSX to CSV conversion lossless?

No. CSV is a re-encoded format, so some data is discarded to reach the target format. XLSX workbooks are read and written with ExcelJS.

Is there a size limit?

For reliable results keep the input under 25 MB. Very large files run out of memory in the browser rather than failing quietly.

Which browsers are supported?

Any current version of Chrome, Edge, Firefox or Safari on a desktop. The conversion engines need WebAssembly and Web Workers, both of which are standard since 2018.