Convert offline spreadsheets into developer-ready JSON. Support for .xlsx, .xls, and multiple worksheets with 100% client-side security.
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Supports .xlsx, .xls, .ods, and .csv
If your workbook contains multiple sheets, they will be exported as a single JSON object where each key is a sheet name containing an array of row objects.
Structured JSON will appear here after upload...
Preserves data types from your Excel cells including dates, currencies, and percentages.
Efficiently handles workbooks with dozens of sheets and thousands of rows without crashing.
No cloud processing. Your Excel files stay 100% private and never leave your machine.
A simple 3-step process to transform your spreadsheets.
Select your .xlsx or .xls file. We also support .ods and .csv formats.
The tool automatically detects all sheets and converts rows into structured JSON arrays.
Copy the result to your clipboard or download it as a .json file.
Discover how professionals use this tool in real-world scenarios.
Move data from legacy Excel spreadsheets to modern web applications and databases.
Example
Importing a customer list from Excel into a new CRM API.
Quickly convert configuration or reference data maintained in Excel into JSON for code.
Example
Converting a lookup table into a JSON constant for a frontend app.
Build internal dashboards by converting business-maintained spreadsheets into API-ready JSON.
Example
Feeding a charting library with data extracted from financial sheets.
Expert advice from Systems Architect
If your file has multiple sheets, the JSON will be structured as an object indexed by sheet names.
The tool automatically skips empty rows at the end of sheets to keep your JSON output clean.
Numbers and booleans are intelligently parsed, while dates are converted to ISO strings.
These tips come from our team of document processing engineers with over 10 years of combined experience in PDF technology, file conversion, and digital document workflows. We've processed millions of documents and learned what works best.
Excel files are the backbone of business data, but they aren't easily readable by modern software. Our converter provides a bridge, allowing you to feed spreadsheet data directly into your apps and APIs.
Trusted by professionals worldwide for secure, reliable document conversion.
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Yes. If your workbook has multiple sheets, they will be organized by sheet name in the final JSON object.
The tool assumes the first row of each sheet contains headers, which become the keys in your JSON objects.
Since the conversion happens locally, the limit is based on your browser's memory. Most spreadsheets up to 20-30MB convert instantly.
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