In: .xlsx, .xlsm, .xlsb, .xls, .ods, .csv, .tsv and .txt – from Excel, LibreOffice, OpenOffice, SoftMaker PlanMaker, Collabora Office, or any tool that saves standard formats. You can also paste cells copied from any spreadsheet app, including Google Sheets in the browser.
- Multi-sheet workbooks: every sheet appears as a tab.
- Formula cells: the cached result is read (the app does not recalculate).
- CSV dialects: comma, semicolon (German-style), tab and pipe are sniffed automatically; UTF-8 and UTF-16 both work.
- Big files: there is no fixed file-size, row or cell limit; your PC’s memory sets the practical maximum.
- Password-protected files cannot be read – remove the password first.
Out: .json (objects – flat or nested – rows as arrays, headers + rows, A1 cell map), .ndjson (one object per line), .jsonld (JSON-LD linked data), .csv and .tsv – copied to the clipboard or saved as a file.