Enumerate Integers

Standard starts at 1 (1, 2, 3, …) and matches how humans usually count list items. Zero-based starts at 0 (0, 1, 2, …) and matches how most programming languages index arrays. Pick zero-based when the output will be used as array indices, otherwise standard is the natural choice.

Use it when the list is a continuation of an earlier one – e.g. your previous batch ended at row 50, so set custom start to 51 to keep the numbering contiguous. You can also start from a negative number (−5, −4, …) or from zero with a custom range, which neither standard nor zero-based gives you.

Reverse counts the labels down from N (the count of integers) to 1. With 5 integers you get 5. first, 4. second, 3. third, 2. fourth, 1. fifth. The order of the integer values themselves is preserved – only the labels are reversed. Useful for countdown lists, descending priorities, or remaining-items displays.

They pad every label to the same character width using the largest label’s width as the target. So with 100 items you get 001, 002, …, 100 instead of 1, 2, …, 100. Files and rows sort alphabetically as well as numerically when widths match, so leading zeros are essential when the labels become filenames or directory names.

Yes – both as values (the integers themselves) and as custom-start labels. A list of -42, -100, 7 with standard format gives 1. -42, 2. -100, 3. 7. A custom start of -3 with three items gives -3. first, -2. second, -1. third. With leading zeros and a negative custom start, the minus stays outside the padding (-05, -04, -03).

Each non-numeric token is skipped and counted. The stats line tells you how many were skipped – e.g. 3 enumerated • … • 2 skipped (non-integer) – so nothing is lost silently. The valid integers are enumerated as if the non-numerics were never there. A token must match -?[0-9]+ to count: 3.14, 1e5, and 0x1A are all rejected as “non-integer”.

Yes. Integer values are treated as strings through the whole pipeline – they’re never parsed to Number or BigInt – so a 100-digit or 1,000-digit integer survives byte-for-byte. The label numbers themselves still use regular JavaScript Number, so the label N has the usual 53-bit safe-integer limit (≈9×10¹⁵), which is far larger than any practical list length.

Yes. The page loads three static files (HTML, CSS, JS) and then runs entirely in your browser. Your integers never leave the device – no fetch, no XHR, no analytics, no cookies. You can disconnect from the internet after the page loads and the tool still works.

Yes – free, unlimited, no signup, no watermark. Use the enumerated output anywhere. Attribution to is appreciated but not required.