CSV Converter
Swap between CSV, JSON, and Excel without your data leaving the browser.
Tap to choose a file
How it works
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Choose or drop a CSV, JSON, or Excel file.
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Pick the format you want — CSV, JSON, or Excel.
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Click Convert data.
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Download the converted file.
Frequently asked questions
Does my data leave my computer?
No. The whole conversion runs in your browser — your file is never uploaded, so it works even for sensitive datasets like survey results or grades.
What JSON shape does the converter expect?
An array of objects, e.g. [{"name": "Sara", "score": 95}]. Each object becomes one row. Nested objects one level deep are flattened into dot-separated columns like address.city.
What about Excel workbooks with multiple sheets?
Only the first sheet is converted. If you need another sheet, move it to the first position in Excel before uploading.
How large can my file be?
Up to 50 MB. Since everything runs locally, very large files are also limited by your device's memory.
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