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 your files, rearranges them and writes new ones — renamed, merged or unpacked — without changing the originals you dropped in.
When you need it
Tidying up after the fact: a folder of photos named IMG_4821, twelve monthly exports to put in one sheet, an archive somebody sent that you want to look inside before trusting it.
Limits and caveats
Everything is held in memory while it works, so a very large batch is limited by your device. The result comes back as a download (a ZIP when there are many files). 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.
Everything happens on this device: no file is uploaded and nothing leaves the browser.
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.