ToolBirch

Excel to CSV

Read .xlsx workbooks locally and export the first sheet as CSV.File & Data Tools

Excel to CSV

Read .xlsx workbooks locally (unzipped and parsed in your browser) and export the first worksheet as CSV.

About this tool

The .xlsx container is unzipped and its worksheet XML parsed right here — formulas export as their last calculated values stored in the file, exactly as other readers see them.

How to use the Excel to CSV tool

  1. Choose the workbook. Select an .xlsx file up to 20 MB.
  2. Review the sheet. The first worksheet renders as a table with detected headers.
  3. Export. Download the flattened CSV.

Supported formats

Input

  • Plain text or file input

Output

  • Converted or analysed output

Inputs are validated before anything is processed. Invalid values and unsupported files are rejected with a clear error instead of failing silently.

Frequently asked questions

Are formulas recalculated?

No. The stored (last saved) values are exported, which is what the file itself contains.

Which sheet is used?

The first worksheet; multi-sheet selection is not offered.

Why the 20 MB limit?

Unzipping large workbooks into memory can exhaust browser tab memory.

Privacy

Everything you enter stays in this browser tab. There is no upload endpoint for tool inputs, no account, and no server-side copy of your text or files. Results are produced locally and disappear when you close the page.

No account is required and no file is ever uploaded. See the privacy policy for details about analytics and the limited data this site stores.

Known limitations

  • Only .xlsx (and not legacy .xls binary) workbooks are supported.

Related tools

Other free tools from the same collection.

CSV ViewerView CSV files as a clean table with correct RFC 4180 parsing.CSV EditorEdit CSV cells in a grid and export clean, correctly-escaped CSV.CSV to ExcelConvert CSV into a real .xls workbook with typed numeric cells.CSV to JSONConvert CSV rows into a JSON array with optional type inference.