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Remove Duplicate Words

Remove all repeated words from a line of text, keeping only the first occurrence of each word.

Frequently Asked Questions

Does this preserve line breaks?

Yes. Most operations work line-by-line and keep newline structure.

What does slugify do?

It converts text to URL-safe lowercase words separated by hyphens.

Is text processing private?

Yes. All transformations run in your browser only.

Example input/output

Input: the cat sat on the mat on the floor

Output: the cat sat on mat floor

How it works

This tool splits the input on whitespace, tracks seen words in a Set, and rebuilds the string keeping only the first occurrence of each word (case-insensitive comparison). Processing runs in your browser.

Common use cases

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