What goes in, what comes out
Accepts: .xlsx (Excel 2007+), .xls (Excel 97–2003), .csv. Multi-sheet workbooks are supported — pick which sheet to export from the tabs.
Outputs:
- CSV — Universal. Opens in Excel, Google Sheets, databases, any data tool. Default choice.
- JSON — Array of objects keyed by the first row's column names. Drop straight into a JavaScript app or API request.
- TSV — Tab-separated. Safer than CSV when your data contains commas (addresses, descriptions).
When to pick JSON over CSV
JSON if you're feeding data into code (a script, an API, a database import that expects JSON). CSV if you're going to open it in a spreadsheet or send it to someone non-technical.
FAQ
Does it preserve formulas?
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No — formulas are converted to their current calculated values. CSV and JSON don't have a concept of formulas, only values.
What about formatting (colors, fonts)?
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Lost — those formats don't support styling. Only the raw data is exported.
Is my data sent to a server?
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No. The file is parsed entirely in your browser using the open-source SheetJS library. Safe for confidential financial and HR data.