CSV Viewer & Sorter

Auto-mode counts tabs, commas, pipes, and semicolons on the first non-empty line and picks the most common one. For mixed data, pick the delimiter explicitly.

Yes — when both sides of a comparison are numeric, the sort uses numeric ordering. Mixed or non-numeric columns fall back to localeCompare.

No. Parsing and sorting happen in the browser. Even Load file just reads the file locally via FileReader.

Bound by browser memory. Tens of thousands of small rows render smoothly; millions may be slow because the table renders all rows.

It is behaving as a number sort when both cells parse as numbers, which is usually what you want — 9 before 10 rather than after. An id with a mix of digits and letters falls back to text order instead, where 10 does come before 9, because that is the only order text has.

For looking, yes — and it is often better, because a spreadsheet will silently reformat a long number into scientific notation and strip leading zeros from a postcode on open. This shows the cells as they are in the file. It cannot edit or save, so it is a reader rather than a replacement.