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Spreadsheet Converter

Move workbooks and tabular data between Excel, OpenDocument, delimited text, JSON and HTML with settings tailored to each destination.

Add spreadsheets

XLSX, XLS, XLSM, XLSB, ODS, CSV, TSV, JSON, or HTML tables · up to 10 files

Files are parsed and converted locally. Macros and external workbook connections are never executed, and no files are uploaded.

How to use Spreadsheet Converter

  1. 1

    Add up to ten XLSX, XLS, XLSM, XLSB, ODS, CSV, TSV, JSON or HTML-table files.

  2. 2

    Choose a valid Output for each item, or select Output for All to apply one format to every eligible file in the batch.

  3. 3

    Open Advanced Settings to choose the worksheet for single-table outputs and adjust the available delimiter, encoding, JSON, HTML or safety options.

  4. 4

    Expand Conversion warnings when present, then click Convert for one file or Convert All for the eligible batch.

  5. 5

    After conversion, use each red Download button repeatedly or download multiple completed results together as a ZIP.

Frequently asked questions

About Spreadsheet Converter

A spreadsheet conversion is not just a change of extension. Workbook formats can carry several worksheets, formulas, merges, number formats and styles, while CSV, TSV, JSON and HTML describe tabular data in very different ways. This converter exposes the choices that determine how that information crosses the boundary.

Every source has an independent output and settings state. Output for All applies a common destination only where it is valid, leaving incompatible or already-matching files clearly skipped instead of blocking the batch. Content-aware warnings call out detected worksheet, formula, merge, macro or formatting consequences without alarming users about features that are not present.

Text inputs can be reparsed with a corrected encoding or delimiter, and exports offer practical controls such as UTF-8 BOM, JSON shape and formula-injection protection. Completed files replace their Convert action with Download, while the original sources remain untouched throughout local browser processing.