Letter Randomizer
This letter randomizer shuffles the letters inside each word while leaving punctuation, spacing and line structure exactly where they are. Keeping the first and last letter of each word in place produces the familiar effect where the text stays surprisingly readable despite every middle letter having moved — a useful demonstration of how much reading relies on word shape and context rather than letter-by-letter decoding. Words shorter than four letters are left alone in that mode, since there is nothing in the middle to shuffle. There is also an option to scramble the order of words instead of the letters within them.
How it works
Shuffles the letters inside each word while leaving punctuation and spacing where they are. Keeping the first and last letter in place produces the familiar effect where text stays surprisingly readable.
Words shorter than four letters are left alone when ends are kept, because there is nothing in the middle to shuffle.
Everything runs in your browser — nothing you paste is sent to a server.
Press the button again for a different arrangement.
The readability effect
Scrambling the middle letters of every word while keeping the first and last in place leaves text that most people can still read at close to normal speed. It is a striking demonstration that fluent reading works on word shapes and context rather than on decoding letter by letter.
The effect is weaker than the popular version of the claim suggests — long words, unfamiliar words and words with similar shapes all slow readers down noticeably. Try it on technical prose and the difference is obvious.
What is left untouched
Only the letters and digits inside each word are moved. Punctuation, spacing, capitalisation positions and line breaks all stay exactly where they were, so the text keeps its shape on the page.
Common use cases
- Demonstrating the reading effect in a talk or a lesson.
- Generating puzzle text and word games.
- Obscuring sample text in a screenshot while keeping its layout.
Frequently asked questions
How do I scramble letters?
Paste your text into the left panel. Each word is scrambled immediately; press "Shuffle again" for a different arrangement.
Why keep the first and last letter?
It produces the well-known effect where text remains readable even though every middle letter has moved, which demonstrates how much reading depends on word shape and context.
What happens to short words?
Words of three letters or fewer are left alone when ends are kept, because there is no middle to shuffle.
Is punctuation affected?
No. Only letters and digits inside words are shuffled — punctuation, spacing and line breaks stay exactly where they were.
Can I scramble word order instead?
Yes. Tick "Scramble word order instead" and the words within each line are shuffled while the letters inside them stay intact.
Is my text uploaded?
No. Everything runs in your browser.
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