Excel to CSV Converter
Local-first
Convert XLSX spreadsheets to CSV locally in your browser.
What is Excel to CSV?
Convert XLSX spreadsheets to CSV locally in your browser.
- Convert XLSX to CSV locally
- Use the first worksheet
- Download spreadsheet-ready CSV
How to use it
- Paste the Excel, CSV content you want to process.
- Adjust quality, size, or output options when available.
- Run the tool to convert Excel to CSV and preview the result on the page.
- Copy the output or download the generated file when it looks right.
Best use cases
- Clean developer data during debugging, API work, and documentation.
- Clean content before saving configs, sharing snippets, or importing tables.
- Use it when privacy matters and the input should stay inside the browser.
Official standards and scope
ECMA-376 defines Office Open XML, read-excel-file documents the browser parser used by this page, and RFC 4180 records common CSV conventions. The file picker and filename check accept only .xlsx. The bundled read-excel-file 9.2.0 parser returns all sheets, but this implementation takes only the first sheet and exposes no sheet selection, schema, date-format option, or formula evaluator; the library explicitly does not calculate formula cells. Each returned cell is converted with JavaScript String(), every value is double-quoted, embedded double quotes are doubled, rows use LF, and the original workbook name becomes the download name. Dates can therefore reflect JavaScript string formatting, and textual values beginning with spreadsheet formula characters are not neutralized. Styles, merged-cell intent, formulas, comments, links, validation, hidden state, and workbook metadata are not preserved. Inspect important types and spreadsheet safety before use.
- ECMA-376: Office Open XML File Formats - Ecma International
- read-excel-file official project documentation - read-excel-file project
- RFC 4180: Common Format and MIME Type for CSV Files - RFC Editor
Sources checked July 27, 2026. Standards, dependencies, and platform rules can change; review the original sources again before formal integration or compliance decisions.
Notes
- Browser support for Excel, CSV can affect preview and export behavior.
- Invalid input will show an error when possible, but the tool will not guess missing fields.
- Preview the result before using it in production, publishing, or submission workflows.
FAQ
Are Excel files uploaded?
No. The workbook is parsed in your browser and not uploaded to DataHub.
Is Excel to CSV free to use?
Yes. You can use it directly in the browser without creating an account.
Does Excel to CSV support batch processing?
Text tools usually process one pasted input at a time, so split large jobs into smaller inputs.
Are files or content uploaded?
Excel to CSV runs in your browser, so your input or files are not uploaded to DataHub servers.
Can I use Excel to CSV on mobile?
Yes, but desktop browsers are better for large files, batch conversion, or long text input.
Why can conversion or validation fail?
Common causes include invalid syntax, missing required fields, or invisible characters copied with the input.
Can I use the result commercially?
The tool only processes your own input. Commercial use depends on the rights of the original file or data.