Drop your files in, pick a format per file, and convert. Everything runs right here in your browser.
Click or drag your files hereAccepts .csv, .xlsx, .xls and .json
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How conversions work
CSV — types are detected automatically; the delimiter can be changed in Settings.
XLSX — only the first sheet is read on the way in, and output workbooks get one sheet.
JSON — an array of objects becomes rows directly, a single object becomes one row, and nested fields flatten into parent.child columns. Converting JSON to JSON just reformats the original structure instead, without flattening.