XLSX to CSV Converter

Overview

Turn an Excel sheet into a plain CSV file. Open an .xlsx or .xls file, check the preview, and download. Formulas come out as their values and text is saved as UTF-8, so the file opens cleanly in Excel, Google Sheets or pandas. It all runs in your browser, so your spreadsheet stays on your computer.

Data pipeline prepGet Excel exports ready for pandas, SQL databases or ETL jobs that don't take XLSX.
Sharing with other toolsHand data to software or people that can read CSV but not Excel files.
Confidential dataConvert payroll or budget sheets without uploading them anywhere.
Single-table exportsGet one clean table out of a workbook instead of copying cells by hand.
Quick format checksPreview the CSV to check column order and encoding before it goes into a repo or data store.

Key features

Excel to CSV in your browser
Comma-separated, UTF-8 output
Preview before you download
Formulas exported as their values
Reads .xlsx and older .xls files

Set

Document Tools 12

Neighbours

01 Invoice Builder 02 CSV to JSON Converter 03 CSV to XLSX Converter 04 JSON to CSV Converter 05 JSON to XLSX Converter 06 Markdown Editor & Live Preview

Specification

Command: document.xlsx_to_csv
Set: Document
Input: MIXED
Output: CSV
Max file: 50MB
Batch: single file

VND.OPENXMLFORMATS-OFFICEDOCUMENT.SPREADSHEETML.SHEET VND.MS-EXCEL

Runtime

Engine: SheetJS · Intl.Segmenter
Threads: single
Isolated: —
WebGPU: —
Memory: —

Transport 0 B

Your file is opened, worked on and saved inside this tab. This tool has no upload step, so your file has nowhere else to go.

Keys

Search: ⌘K
Panels: ⌘1 · ⌘2
Full width: F
All keys: ⌘/

How it works

Open your file

Pick an .xlsx or older .xls file from your computer.

Check the preview

See the first rows of the CSV before you save anything.

Download

Save the CSV file to your computer.

Frequently asked

What Excel file formats can I convert?

Both .xlsx and older .xls files. The tool detects which one you have.

Can I choose different CSV delimiters?

Not yet. The CSV always uses commas, which Excel, Google Sheets and most data tools read without trouble.

How are multiple sheets handled?

The tool converts the first sheet in the workbook. To convert another sheet, move it to the front in Excel, or save it as its own file.

Will formulas be converted?

You get the calculated values, not the formulas, so the CSV holds the actual numbers.

How are special characters handled?

Accents, symbols and other Unicode text come through intact. The CSV is saved as UTF-8.

Is there a limit on file size?

Files up to 50 MB work. For bigger ones, split the data across smaller workbooks first.

Keys

Search: ⌘K
Panels: ⌘1 · ⌘2
Full width: F
All keys: ⌘/