Change Integer Sign

Negates every non-zero integer – positives become negative and vice versa. Zero stays zero because -0 === 0 and it has no sign to flip.

Replaces every integer with its absolute value: -42 → 42, 15 → 15, 0 → 0. Useful for distance metrics and normalising magnitudes before further processing.

They negate integers at alternating 1-indexed positions. Flip Odd hits positions 1, 3, 5, … Flip Even hits positions 2, 4, 6, …. Combined with a reset and a re-run they make it easy to build or break alternating-sign patterns like geometric series.

Zero is unchanged in every mode. The “Changes” counter in the stats line also ignores zero – so you can confirm that zeros really did pass through.

Yes. 100,000 integers run in well under 50ms on a modern laptop. Because the live preview is debounced at 200ms, continuous typing does not pile up work.

Maths (explicit negation, absolute value), finance (debit/credit toggle), physics (direction reversal), dataset normalisation (folding signed to unsigned or vice versa), and building alternating-sign series for quick test data.

Readability for humans at the cost of machine round-trip. Off by default so the output parses cleanly by any downstream CSV or number reader. Turn it on when you are pasting into a report.

Up to Number.MAX_SAFE_INTEGER (2^53 – 1 = 9,007,199,254,740,991) every integer is represented exactly. Past that the parseInt call loses precision – that’s a JavaScript limitation, not a tool bug.

Yes. All processing runs client-side in your browser. No network requests touch the integers – no upload, no telemetry.

Yes on both. Free with no sign-up, subscriptions, or usage caps. After the page has loaded you can disconnect from the network and the tool keeps working.