Remove Duplicate Words From Text

The first occurrence is kept and every later identical word is removed, so the reading order never changes. If you enable Ignore case, the casing of that first copy is what appears in the result.

Words are separated by any run of whitespace, meaning spaces, tabs and line breaks. A maximal run of non-space characters counts as a single word, so attached punctuation travels with it.

The trailing comma is part of the token, so 'cat,' and 'cat' are different words to the tool and only exact matches are dropped. If you need to ignore punctuation, strip it first or use the Duplicate Word Finder, which splits on non-letter characters.

When it is on, the kept words are re-joined with a single space each, which tidies uneven spacing. When it is off, the original whitespace that preceded each kept word is preserved, so tabs and double spaces stay intact.

It removes every repeat anywhere in the text, not just back-to-back doubles. The first 'the' in a paragraph is kept and all later ones are dropped regardless of how far apart they sit.

Line breaks count as whitespace between words. With Collapse extra spaces on the output becomes a single spaced line, and with it off the original breaks that preceded kept words are retained.

There is no hard cap. The deduplication runs in your browser, so the practical ceiling is your device memory, and even long articles process instantly.

Use the Duplicate Word Finder instead. It lists every repeated word with a count and flags accidental doubles like 'the the' rather than rewriting your text.

Yes. Everything runs locally in your browser and nothing is uploaded to a server, so sensitive or unpublished text never leaves your device.