Spreadsheets converter

XLSX to CSV

XLSX to CSV turns XLSX files into CSV output locally. It is built for private one-off conversion when you need a downloadable result without sending the source file to a server.

Local only 30 MB limit XLSX to CSV

FromXLSX

ToCSV

Select XLSX file

Drop files here or choose from your device. Limit: 30 MB.

Advanced optionsBalanced defaults

Workflow

Local file in, local file out.

Select or drop your source file.
Adjust advanced options if needed.
Convert and download from this page.

At a glance

No upload step Single file workflow 0 advanced options

Notes

Know before converting.

Conversion happens locally with browser APIs or local WebAssembly.
Very large files depend on device memory and browser limits.

Good for

Common uses.

Workbook exportsTabular cleanupSpreadsheet imports

Format details

What this converter handles.

XLSX input is accepted by this browser tool.
CSV output is generated on this device before download.
Selected files are limited to 30 MB for realistic browser memory use.

Privacy

Browser-only by design.

I Hate Converter does not upload your file for this XLSX to CSV conversion. The selected file is read by browser APIs or local WebAssembly, then the downloadable output is created on this device.

Explore no-upload file converters

Format-specific guide

XLSX to CSV: expected result.

This page will convert a valid XLSX file into CSV output locally.
The chosen worksheet is exported as values in a flat table. Formulas, charts, multiple sheets, and spreadsheet styling are not retained.
Process only files within the page limit in a current Chrome, Firefox, Safari, or Edge browser; larger or complex files can run out of memory.

Use it when

Practical XLSX to CSV uses.

exporting a spreadsheet table.
moving data into an API workflow.
creating a lightweight data file.

What it cannot do: This tool is for valid XLSX files that the current browser can read. It cannot repair corrupt files, bypass DRM or passwords, preserve unsupported embedded features, or guarantee that another app supports every CSV variation.

Troubleshooting

When XLSX to CSV needs attention.

The source file is rejected or the result looks wrong

If a formula or sheet is missing, check the selected sheet and remember that flat formats cannot retain workbook features. Check the delimiter, quoting, and header row when columns appear shifted or values are merged.

Will every feature transfer?

This tool is for valid XLSX files that the current browser can read. It cannot repair corrupt files, bypass DRM or passwords, preserve unsupported embedded features, or guarantee that another app supports every CSV variation.

Questions

Good to know.

Does this upload my file?

No. The selected file is processed locally by browser APIs or local WebAssembly.

Why are there size limits?

Browsers have memory and CPU limits. The listed limit keeps each visible tool realistic.

Can output quality change?

Some converters include advanced options. Formats with inherent limitations still follow browser support.