Convert XLS to JSON
Convert XLS files to JSON locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
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How to convert XLS to JSON
- Drop your .xls files above, or click Upload Files. You can add many files at once.
- JSON is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. SheetJS runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .json files as soon as each one finishes.
What to know about XLS to JSON conversion
- JSON holds a single table: convert the active sheet only, or all sheets at once (as one JSON object keyed by sheet name).
- Cell values are exported as they were last calculated; formulas, formatting and charts are not part of the output.
- JSON is best for APIs, JavaScript apps and data pipelines, and opens in code editors, browsers and every programming language.
XLS vs JSON
| Feature | XLS (Excel 97-2003 Workbook) | JSON (JSON Table) |
|---|---|---|
| Multiple sheets | Yes | No |
| Formulas and formatting | Yes | No |
| Best for | compatibility with Excel 97–2003 and legacy systems | APIs, JavaScript apps and data pipelines |
| Opens in | Excel, LibreOffice and Google Sheets | code editors, browsers and every programming language |
XLS (Excel 97-2003 Workbook): The legacy binary Microsoft Excel format (BIFF8), still common in older systems.
JSON (JSON Table): Tabular data as a JSON array of row objects, ideal for APIs and JavaScript applications.
Conversion options
- Active sheet only or all sheets
- Custom output file name
Frequently asked questions
Is it safe to convert XLS to JSON here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several XLS files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert JSON to XLS.
Convert XLS to other formats
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