Excel to CSV or JSON
Open an .xlsx workbook, pick the sheet and the header row, and take it out as CSV or JSON.
Free No signup Runs in your browser — nothing uploaded
What it does
Excel to CSV or JSON reads the whole document before doing anything, so what comes back is either valid output or a specific error with the position that caused it — not a partially rewritten file.
When you need it
Usually when something has already gone wrong: a config file an application will not load, an API response that has to be read by a human, or an export that has to be checked before it goes anywhere near a database.
Limits and caveats
Key order is preserved as it appears in the input. Very large documents are limited by your device's memory rather than by an upload cap, since the parsing happens locally. Everything happens in your browser, so the file never leaves your device.
How to excel to csv or json
- Drop the workbook.
- Pick the sheet, and which row holds the column names.
- Take the result as CSV or JSON.
Frequently asked questions
- Why does it show me a grid first?
- Because a workbook usually has more than one sheet, and often a title or a blank line above the real header. Converting the wrong one is the failure every other converter hands you silently.
- What happens to dates?
- They come out as YYYY-MM-DD. Excel stores a date as a count of days from 1899-12-30 — an epoch chosen to reproduce a Lotus 1-2-3 bug — so a converter that ignores the cell's format gives you a five-digit number instead.
- Does it read old .xls files?
- No. That is a different, much older binary format. Open it in any spreadsheet app and save as .xlsx first.
- Do my files get uploaded?
- No. This tool runs entirely in your browser, so the file never leaves your device.