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Excel to JSON Converter Online — Free Tool

Extract data from XLSX or XLS spreadsheets and convert it directly to structured JSON without server-side processing.

Excel
Reads XLSX in your browser (no upload). Uses the first row as headers.
Privacy note: All processing happens entirely in your browser. No data is sent to our servers.

About this tool

Excel workbooks (.xlsx) store sheets as structured tables. This tool reads a spreadsheet locally and converts rows to JSON for APIs, databases, or JavaScript apps.

Processing happens in your browser—workbooks with sensitive figures or PII never leave your device.

Common use cases

  • Migrating Excel templates into web applications
  • Converting pricing or catalog sheets to JSON configs
  • One-off imports during prototyping
  • Extracting sheet data without installing desktop macros

How to use

  1. Select an .xlsx or .xls file from your device.
  2. Choose the sheet to convert if the workbook has multiple tabs.
  3. Review JSON rows mapped from spreadsheet columns.
  4. Copy or download JSON for your integration pipeline.

This page is available at /tools/excel-to-json/.

Understanding the result

  • First row is often treated as headers mapping to JSON property names.
  • Cell types (dates, numbers, formulas) may appear as strings or serial numbers—normalize in your app.
  • Merged cells can produce sparse rows; clean the sheet first if output looks misaligned.
  • Large workbooks consume browser memory; split huge files if conversion stalls.

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FAQ

Which Excel formats are supported?

Modern .xlsx is primary; some tools also accept legacy .xls depending on parser support.

Are formulas evaluated?

Output usually reflects stored values, not live formula evaluation. Save calculated values in Excel first if needed.

Can I convert multiple sheets?

Typically one sheet at a time. Export or select the active sheet you need.

Is the file uploaded to a server?

No. Parsing runs locally in your browser for privacy.