Duplicate Line Checker
Find which lines repeat in a list, and where they are.
Shuffle Lines
Randomise the order of a list, fairly and repeatably.
Quick Tool Overview
Shuffle Lines randomises the order of a list with a fair Fisher-Yates shuffle, and can draw a random subset from it — which is a prize draw or a sample. Duplicates can be removed first so every entry has an equal chance.
- What it does
- Randomises list order and draws random subsets
- You give it
- A list with one entry per line
- You get back
- The shuffled list, numbered, or a drawn sample
- Best for
- Running orders, draws, sampling and test case ordering
About the Shuffle Lines
Randomising a list is the fair way to settle an order — who presents first, which name is drawn, what sequence a set of test cases runs in. Doing it by hand is not random, and doing it in a spreadsheet with a random column is more work than it should be.
This shuffles the lines of a list using Fisher-Yates, which produces a genuinely uniform result. It can also draw a random subset — the first five of the shuffled list — which is a prize draw or a sample. Blank lines can be dropped, duplicates removed before the shuffle, and each result is numbered so the order is easy to read out.
Key features of the Shuffle Lines
Draw a subset
Take the first few of the shuffled list, which is mathematically identical to drawing them at random.
De-duplicate before drawing
A name entered twice would otherwise have twice the chance, so repeats can be removed first.
Numbered output
The shuffled order is numbered, which makes it easy to read out or work through.
Uniform shuffle
Fisher-Yates gives every order an equal chance, which a random-key sort does not.
Nothing recorded
The list and the result exist only in the page, so copy anything you need before shuffling again.
How to use the Shuffle Lines
-
1
Paste your list
One item per line — names, tasks, entries or test cases.
-
2
Clean it first if you need to
Drop blank lines and remove duplicates so every entry has an equal chance.
-
3
Shuffle
Press shuffle for a fresh random order; press again for another.
-
4
Draw a subset if you want one
Set how many to pick and the tool shows just that many from the top of the shuffled list.
Frequently asked questions
The shuffle itself is uniform — Fisher-Yates driven by the browser's random number generator gives every order an equal chance. For anything with legal or financial weight, use a process that can be audited, since nothing here is recorded.
Yes. Set the number to draw and the tool shows that many entries from the top of the shuffled list, which is mathematically the same as drawing them at random.
For a draw, yes — a name entered twice otherwise has twice the chance of being picked. The tool can remove duplicates as part of the same operation.
No. Nothing is stored anywhere, and each shuffle is independent of the last. If you need to keep a result, copy it before shuffling again.
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