Supports .xlsx, .xls, .csv and .ods. Your file is parsed in your browser and never uploaded.
Convert Excel (XLSX/XLS/CSV) to JSON online, free. Spreadsheets store tabular data in the Office Open XML (.xlsx, ECMA-376) and legacy .xls formats, but APIs and code expect JSON. This converter reads your workbook in the browser, takes the first row as field names, and turns every following row into a JSON object — with optional multi-sheet output — so you can move spreadsheet data straight into code, a database seed, or an API payload.
The spreadsheet is parsed entirely in your browser with the SheetJS library; only the library is fetched from a CDN — your file itself is never uploaded, logged, or stored. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.
Reads modern .xlsx, legacy .xls, comma-separated .csv and OpenDocument .ods files — pick a file and it parses instantly.
The first row is treated as column headers, so each data row becomes a JSON object keyed by those names — ready for code.
Convert just the first worksheet, or tick Include all sheets to export every sheet as a named object in one JSON document.
Parsing runs locally in your browser via SheetJS; your spreadsheet is never sent to a server, so it is safe for confidential data.
The tool reads your workbook in the browser, uses the first row of a sheet as the field names, and maps each subsequent row to a JSON object — cell values become the property values. The result is an array of objects (one per row), exactly what most APIs and code expect.
Yes. By default only the first worksheet is converted. Tick 'Include all sheets' and the output becomes a single JSON object whose keys are the sheet names, each mapping to that sheet's array of row objects.
No. The file is parsed entirely in your browser using the SheetJS library. Only that library is loaded from a CDN; your spreadsheet's contents never leave your device, which makes the tool safe for sensitive or internal data.
Yes — this converter is free with no signup and, unlike many hosted tools, parses your file in the browser so nothing is uploaded. It supports .xlsx, .xls, .csv and .ods with single- or multi-sheet output.
Empty cells are emitted as null so every row keeps a consistent shape. Dates are parsed as date values (cellDates) and serialized in ISO-style form, so they stay machine-readable rather than appearing as Excel serial numbers.
The converter handles Office Open XML (.xlsx), the legacy Excel binary format (.xls), comma-separated values (.csv) and OpenDocument spreadsheets (.ods) — the formats SheetJS reads natively.
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