60 file types

Convert ODT to XLSX

A word processor file is not a spreadsheet, so what crosses over is the tables drawn inside it - the first one, where a document holds several. Figures come across as figures rather than as the text the page displayed, so a column of them adds up in Excel instead of sitting there as words.

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What is ODT?

What LibreOffice, OpenOffice and Google Docs save a document as, and the ISO-standard counterpart to .docx. Inside it is a zip of XML, which is the reason a table drawn in one can be read back out at all. It is a page format first - paragraphs, page breaks, headers, footnotes - so the only part of it that is data is a table someone drew on the page.

What is XLSX?

A modern Excel workbook, which is really a zip full of XML. Unlike a CSV it knows what a number is, holds multiple sheets, and keeps formulas and formatting. It's what people mean when they say 'send me a spreadsheet'.