FileopiaConvert Excel to JSON
Convert Excel sheets to JSON arrays using the first row as keys. Free and private.
- Upload
- Options
- Download
- ✓ 100% free
- ✓ No sign-up
- ✓ No limits
- 🔒 Files never leave your device
How to: Excel to JSON
- Select Excel files.
- Choose the options.
- Download the JSON.
Turn a spreadsheet into JSON for an app, a website or a script, using the first row as keys.
Common uses
- Power a website table or app from a spreadsheet.
- Convert product catalogues for an online store.
Tips for best results
- Keep headers simple – they become property names.
From rows to objects
Each row below the header row becomes one JSON object, with the header text as keys. Empty cells are skipped or set to null so the output stays clean. Multi-sheet workbooks can be converted sheet by sheet, so a product catalogue and a price list stay separate.
Good spreadsheet habits
Use short, unique header names without line breaks; avoid merged cells; keep one record per row. Dates are exported in a readable ISO format so they can be parsed reliably by JavaScript, Python and other languages.
Why use Fileopia for Excel to JSON?
| Fileopia | Typical upload-based sites | |
|---|---|---|
| Files uploaded to a server | No – processed on your device | Yes |
| Sign-up required | Never | Often for bigger jobs |
| Hourly / daily task limits | None | Common on free plans |
| Watermark on output | Never | Sometimes |
| Works offline after loading | Yes, for most tools | No |
Your files never leave your device
Excel to JSON runs entirely in your browser using JavaScript and WebAssembly. Your files are read from your disk into this tab, processed in memory and saved straight back to your downloads folder – they are never uploaded to Fileopia or any third party.
- Test it yourself: once this page has loaded, switch off Wi‑Fi or mobile data and run the tool – it keeps working.
- Check the network: open your browser’s developer tools (F12 → Network) while processing; you will see no file upload requests.
- Nothing to delete: close the tab and the data is gone – there is no server copy, no retention period and no account.
Frequently asked questions
Are formulas exported?
The calculated values are exported, not the formulas.
Which files are supported?
XLSX, XLS and ODS spreadsheets.
Is Excel to JSON really free?
Yes. Every tool on Fileopia is 100% free with no file limits, no sign-up and no watermarks. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. Fileopia processes your files directly in your browser using JavaScript. Your documents never leave your device, so they stay completely private.
Does it work on mobile?
Yes. Fileopia works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.