Excel to JSON Converter – Secure & Free Online Tool
Convert Excel data to clean JSON arrays instantly in your browser.
Drag & Drop your excel file here
or browse files
Max size: 5MB
🔒 100% Private
Your file never leaves your computer. We use the HTML5 File API for local processing.
⚡ Instant conversion
Zero latency. Convert 50MB+ excel files in seconds without waiting for uploads.
📂 Advanced Options
Select specific sheets, toggle header row support, and minify output.
Why use this Excel to Json Converter?
Excel to JSON Converter is a free, secure, and client-side tool for developers and data analysts. Unlike other tools that upload your files to a server, this tool processes your data locally in your browser using JavaScript.
This makes it the perfect solution for converting sensitive financial reports, customer lists, (GDPR compliant), and proprietary business data from .xlsx or .xls formats into structured JSON.
How to Convert Excel to Json Online
- Upload File: Drag and drop your Excel file (.xlsx or .xls) into the drop zone, or click to select a file from your computer.
- Configure: Only the first sheet is selected by default. Use the dropdown to switch sheets if your workbook has multiple.
- Preview: The JSON preview appears instantly. You can toggle "First row is header" to adjust the JSON structure.
- Export: Click "Copy to Clipboard" to use the data immediately, or "Download JSON" to save the file.
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Frequently Asked Questions
Is it safe to convert confidential data?
Yes. This tool is offline-capable. You can even disconnect your internet after loading the page and it will still work. No data is sent to our servers.
how do convert excel to json with nested objects?
Currently, this tool creates a flat array of objects. For nested structures, we recommend using dot-notation in your Excel headers (e.g., "address.city") and processing the JSON post-conversion.
Is there a file size limit?
The limit is technically your browser's memory. We have successfully tested files up to 100MB with 500,000 rows.