Remove Duplicate Words

Remove repeated words from text two ways: keep only the first appearance of each word, or just collapse doubled words like "the the" that slip into writing. A case-insensitive option treats "The" and "the" as the same. Free and private.

This tool removes duplicate words from text, and it handles the two things people usually mean by that. "All repeats" keeps only the first time each word appears and drops the rest, which is useful for turning a messy list of keywords or tags into a unique set. "Adjacent only" leaves your text intact but collapses accidental doubles, like the "the the" or "is is" that creep in when editing. An ignore-case option counts "Word" and "word" as the same word so nothing slips through on capitalisation alone.

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Your text
Deduplicated

How to use it

  1. 1

    Paste your text

    Add the writing or the word list that contains repeats.

  2. 2

    Pick a mode

    Choose "All repeats" to keep one of each word, or "Adjacent only" to just fix doubled words.

  3. 3

    Copy the result

    The deduplicated text appears on the right. Copy it out when it looks right.

When it comes in handy

Cleaning keyword lists

Collapse a jumble of tags or keywords into a set of unique words with no repeats.

Proofreading

Catch and remove the doubled words like "the the" that are easy to miss when reading.

Tidying pasted text

Strip repeated terms out of notes or transcripts before you reuse them.

Instant & 100% private — nothing is uploaded

Every keystroke is handled right here in your browser. Your text is never sent to a server, so there is no sign-up, no email wall, and no length cap from us. Load the page once and it keeps working even if you go offline.

Frequently asked questions

What is the difference between the two modes?
"All repeats" removes every later occurrence of a word anywhere in the text, keeping just the first, and joins the remaining words with single spaces — best for turning a list into unique words. "Adjacent only" removes a word only when it is immediately repeated, so "the the cat" becomes "the cat" while the rest of your text and its layout are untouched.
How is this different from removing duplicate lines?
Removing duplicate lines works on whole lines and keeps entire lines unique. This tool works at the word level within your text. Use line dedupe for lists where each row is one entry, and word dedupe when the repeats are individual words inside sentences.
Does capitalisation matter?
It depends on the "Ignore case" option. With it on, "Apple" and "apple" are treated as the same word, so only one is kept. With it off, they count as different words and both survive. It is on by default because that is what most people expect.

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