Convert Excel to CSV or JSON Online Free (No Upload)
Convert Excel (.xlsx) to CSV or JSON online free — every sheet, no uploads, no signup. Step-by-step guide for analysts and developers, all in your browser.
Excel is where business data lives, but it's a terrible format to feed to a script, an API, or a database. CSV and JSON are the universal exchange formats — and converting from .xlsx shouldn't require uploading a confidential workbook to someone else's server.
Modern browsers can read .xlsx files directly, so the entire conversion happens on your machine.
Excel to CSV: the analyst's workhorse
CSV is the right target when you're importing into another spreadsheet, a BI tool, or a SQL bulk-load. A good converter reads every sheet in the workbook, not just the first.
- 1Open the Excel → CSV tool and drop your .xlsx file onto it.
- 2Pick the sheet you want (or export them all).
- 3Choose your delimiter and whether to keep a header row.
- 4Download the CSV — ready for import anywhere.
Excel to JSON: straight into your code
If a developer is consuming the data, skip CSV entirely and export JSON. Each row becomes an object keyed by the column headers — ready to drop into an API payload, a config file, or a test fixture.
Export your spreadsheet straight to JSON.Excel → JSON · free in your browserTips for clean conversions
- Make sure your header row is the first row — merged title cells confuse every parser.
- Watch for Excel's auto-formatting turning IDs and zip codes into numbers (and dropping leading zeros).
- Dates exported from Excel can be serial numbers — confirm they read as real dates after conversion.
- If you already have CSV, you can chain straight into the CSV → JSON tool for more output options.