Too many rows for Excel — over the 1,048,576 row limit
You import a big export — logs, transactions, sensor readings — and Excel loads it, no error, no warning. Except it didn't: it stopped at row 1,048,576 and quietly left the rest out. Drop the source file in below to read the whole thing.
What this looks like
Opening a large CSV or text import in Excel sometimes throws “This workbook contains more than the maximum number of rows... to see all the data, ... export it into a database.” Other times there's no dialog at all — Excel just loads what fits and the rest is gone, and unless you already know the source has more rows than that, you'd never notice a boundary was crossed.
Why it happens
Every worksheet in the .xlsx/.xls format has a hard grid size: 1,048,576 rows (220) by 16,384 columns. It's baked into the file format itself, not a setting or a version difference — Excel simply cannot address a row past that number on a single sheet, no matter how much memory or disk space you have.
What you actually want
All of the rows, not the first ~1.05 million. xlsx-for-ai reads a file's rows directly rather than loading them onto a worksheet grid, so a source with more rows than Excel can hold doesn't get truncated — you can inspect the full row count, pull out the rows you need, or convert the file without losing anything past Excel's ceiling.
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