What happens when you convert XLS to JSON
- All sheets are converted.
- Formulas are saved as their last calculated values; formatting, charts and merged cells aren't carried over.
- The first row becomes the keys. Headers like address.city create nested objects; numbers and true/false stay typed.
XLS vs JSON
| Feature | XLS | JSON |
|---|---|---|
| Multiple sheets | Yes | Yes |
| Formulas | Yes | No |
| Numbers & dates | Yes | Yes |
| Nested data | No | Yes |
| Best for | Old Excel versions | APIs, web apps |
How to convert XLS to JSON
- Drop your XLS files on the box above, or click it to choose files. You can add many at once.
- Adjust the options if you want. The defaults work well for most files.
- Click Download for each JSON file, or "Download all" to get a ZIP.
Frequently asked questions
Is it safe to convert my files here?
Yes. Conversion happens entirely in your browser. Your files are never uploaded to a server, so nobody else can see them.
Is it free? Are there limits?
It's completely free, with no sign-up, watermarks or daily limits. The only limit is your device's memory for very large files.
Can I convert many XLS files at once?
Yes. Drop as many files as you like; they're converted one after another and you can download them all as a ZIP.
What happens to formulas and formatting?
Each formula is saved as its last calculated value. Cell values, numbers, dates and text are kept; formatting, charts and merged cells aren't.
What about workbooks with several sheets?
Every sheet is converted and kept in the JSON file.
How is nested data handled?
Nested objects and elements become columns with paths like address.city (JSON) or author/name (XML), and converting back rebuilds the nesting.