Excel ↔ JSON Converter
Professional grade converter with large file support & validation.
Processing Data...
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Auto-detected from file
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Click or Drag Excel File
.xlsx, .xls, .csv (Max 50MB)
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JSON Output Preview
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How to Convert Excel to JSON Online
Our Excel to JSON Converter is a powerful, free tool designed for developers and data analysts. It runs 100% in your browser, meaning your sensitive data never leaves your computer. Whether you need to parse a simple CSV or a complex multi-sheet XLSX file, this tool handles it with precision.
Features
- Instant Conversion: transform spreadsheets into JSON objects in milliseconds.
- Privacy First: No server uploads. All processing happens locally under your control.
- Smart Formatting: Automatically converts headers to camelCase, snake_case, or clean keys.
- Nested Objects: Supports dot notation (e.g.,
user.address.city) to generate deep JSON structures. - Large File Support: Optimized for files with 50,000+ rows using web workers.
Supported Formats
.XLSX
.XLS
.CSV
.ODS