AlgorithmsSortingRuns in your browserReviewed October 1, 2026

Quick Sort Visualizer

Pick a pivot, move smaller values left and larger values right, then sort both sides. Interactive step-by-step animation with JavaScript code, complexity and front-end use cases.

Localprivate by defaultFastno sign-up path

SortingTime: O(n log n) on average, O(n²) worst caseSpace: O(log n)

Numbers (2 to 30, comma separated)

Step 1 / 56

Quick sort picks a pivot, moves smaller values to its left and larger ones to its right, then repeats on both sides.

comparing
swapped / moved
pivot / minimum
sorted

JavaScript

1function quickSort(arr, lo = 0, hi = arr.length - 1) {
2  if (lo >= hi) return;
3  const pivot = arr[hi];
4  let i = lo;
5  for (let j = lo; j < hi; j++) {
6    if (arr[j] < pivot) {
7      [arr[i], arr[j]] = [arr[j], arr[i]];
8      i++;
9    }
10  }
11  [arr[i], arr[hi]] = [arr[hi], arr[i]];
12  quickSort(arr, lo, i - 1);
13  quickSort(arr, i + 1, hi);
14}

Tip: use the arrow keys to step and the space bar to play or pause.

Loading animation...

Quick Sort Visualization and Animation

Pick a pivot, move smaller values left and larger values right, then sort both sides. Choose a pivot value. Move values smaller than the pivot to its left and larger ones to its right. Repeat the same steps on the left and right parts. Time complexity: O(n log n) on average, O(n²) worst case. Space complexity: O(log n). One of the fastest general sorts in practice. Useful to understand when sorting large data sets in the browser.

How to use Quick Sort Visualizer

Choose a pivot value.
Move values smaller than the pivot to its left and larger ones to its right.
Repeat the same steps on the left and right parts.
Press Play, or step through with the arrow buttons and change the input to see how it reacts.

Questions

What is Quick Sort?

Pick a pivot, move smaller values left and larger values right, then sort both sides.

What is the time complexity of Quick Sort?

Time: O(n log n) on average, O(n²) worst case. Space: O(log n).

Where do front-end developers use Quick Sort?

One of the fastest general sorts in practice. Useful to understand when sorting large data sets in the browser.

Does this upload my data?

No. This converter runs in your browser for ordinary use, so the input is not sent to a backend by this tool.

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