XLS to JSON Converter
Convert legacy Excel spreadsheets to JSON in your browser. JSON is ideal when you need developers, automation, and app data interchange, while XLS is better known for opens older Office spreadsheets.
- Files never uploaded
- Instant, on-device
- Free & no sign-up
Drop XLS files here, or browse
XLSJSON · files stay on your device
up to 50 MB per file · up to 20 files per batch
How to convert XLS to JSON
- Step 01
Add your XLS file
Drop one or many XLS files onto the converter, or browse from disk. Stay within the on-device size limits shown under the drop zone — oversized files are rejected so your tab does not freeze.
- Step 02
Run the conversion
Start the XLS → JSON conversion. Parsing and rendering happen in your browser tab, which keeps contracts and spreadsheets off remote servers.
- Step 03
Download JSON
Download your new JSON file immediately. Multiple outputs pack into a single ZIP archive.
Why convert XLS to JSON
XLS (legacy Excel workbook) shines when archives and files created in older Microsoft Excel versions, yet many handoffs demand JSON because native fit for APIs, configs, and JavaScript apps. This XLS to JSON tool reshapes the file for that next step without an Office install or an upload queue. Processing stays on your device, which matters for contracts, exports, and anything you would not drop into a random website.
When to use this tool
- A tool, form, or teammate asked for JSON, but you only have XLS.
- You are optimizing for developers, automation, and app data interchange instead of staying in XLS.
- You need JSON’s strengths (native fit for APIs, configs, and JavaScript apps) for sharing, archiving, or importing data.
Good to know
- Output characteristics follow JSON: native fit for APIs, configs, and JavaScript apps.
- Source quirks still apply — XLS is limited by outdated container with weaker compatibility than XLSX, and conversion cannot invent missing data.
- Complex layouts, macros, or embedded media may simplify — skim the result before sending anything final.
- Browser limit: about 50 MB per file, up to 20 files per batch. PDFs are capped at 50 pages; large sheets at about 100,000 rows.
- Need a bigger file? For bigger PDFs or workbooks, use Adobe Acrobat, LibreOffice, Microsoft Office, or a desktop batch tool, then convert a trimmed copy here if you only need a quick private pass.
File size limits for XLS to JSON
Browser limit: about 50 MB per file, up to 20 files per batch. PDFs are capped at 50 pages; large sheets at about 100,000 rows.
Why there is a limit
Documents are parsed and rendered entirely in your browser tab. Oversized PDFs and spreadsheets can exhaust memory, so limits protect the tab while keeping files private.
If your file is too large
For bigger PDFs or workbooks, use Adobe Acrobat, LibreOffice, Microsoft Office, or a desktop batch tool, then convert a trimmed copy here if you only need a quick private pass.
XLS to JSON FAQ
Common questions about converting XLS files to JSON.
Is this XLS to JSON converter free?
Yes. Browser Convert does not charge for XLS → JSON, add watermarks, or require an account.
What happens to formatting when I convert XLS to JSON?
Expect a faithful but not always pixel-identical transfer. native fit for APIs, configs, and JavaScript apps matter most for JSON, while exotic XLS features (outdated container with weaker compatibility than XLSX) may simplify. Always spot-check important pages.
Do I need Microsoft Office or Adobe apps installed?
No. Browser Convert handles XLS → JSON in the browser without installing desktop software.
Is XLS to JSON conversion private on Browser Convert?
Yes. Your legacy Excel spreadsheet is processed in the browser. We do not upload the file to convert it, which is the main difference from typical online converters.
Are there file size limits for XLS to JSON?
Yes. Browser Convert accepts about 50 MB per file, with up to 20 files queued at once. Documents are parsed and rendered entirely in your browser tab. Oversized PDFs and spreadsheets can exhaust memory, so limits protect the tab while keeping files private. If your file is larger, For bigger PDFs or workbooks, use Adobe Acrobat, LibreOffice, Microsoft Office, or a desktop batch tool, then convert a trimmed copy here if you only need a quick private pass.
Can I convert several XLS files to JSON at once?
Yes. Queue up to 20 XLS files and convert them in one pass. When finished, download the batch as a ZIP. Very large batches may need to be split so your browser stays responsive.