Overview
Introduction
Sometimes you need text with deliberately duplicated words, to stress-test a deduplication feature, generate padding text, or produce an exaggerated effect for a creative project.
This tool runs entirely client-side, so nothing you paste is ever uploaded to a server.
What Is Word Duplicator?
A word duplicator that splits text into whitespace-separated words and inserts a copy of each qualifying word immediately after itself, based on an adjustable N (duplicate every Nth word).
With N left at its default of 1, every single word in the text gets duplicated.
How Word Duplicator Works
The tool trims the input and splits it on runs of whitespace into an array of words, then builds a new array where every word is added once, and an extra copy is added whenever its 1-based position is a multiple of N.
The transformation happens synchronously in JavaScript the moment you type or change N, with no network round trip involved.
When To Use Word Duplicator
Use it to generate test data for a duplicate-word detector, create exaggerated or stuttering text for a creative effect, or pad out a sample string for a length or performance test.
It's a fast way to get the answer without opening a code editor, a REPL, or writing a one-off script just to check.
Often used alongside Sentence Duplicator, String Repeater and Word Remover.
Features
Advantages
- Adjustable N lets you duplicate every word or only every Nth word.
- Keeps punctuation attached to a word intact in both the original and the duplicate.
Limitations
- Collapses multiple spaces and line breaks between words into single spaces, so exact original spacing isn't preserved.
- N must be a positive whole number; fractional or zero values aren't accepted.
Examples
Best Practices & Notes
Best Practices
- Set N to 1 for maximum duplication, or a higher number for lighter, spaced-out duplication.
- Pair with a word remover if you need to reverse the effect on a specific target word.
Developer Notes
The implementation loops over the word array with `forEach`, pushing the current word, then pushing it again whenever `(index + 1) % n === 0`, so the check uses the word's 1-based position to decide which words get an extra copy.
Word Duplicator Use Cases
- Stress-testing a duplicate-word or deduplication feature
- Generating exaggerated or stuttering sample text
- Padding out text for a length or performance test
Common Mistakes
- Expecting N to mean "duplicate N times" rather than "duplicate every Nth word".
- Using a fractional or zero N, which isn't accepted; N must be a positive whole number.
Tips
- Combine with a word remover tool afterward if you only want to duplicate part of the text.