Remove Duplicate Words
Repeated words can clutter your writing, confuse readers, and inflate word counts. Our free Remove Duplicate Words tool scans your text and strips out every repeated word while keeping the first occurrence and preserving the original order. Toggle case-sensitive mode to control whether "The" and "the" are treated as the same word. The tool displays the total word count before and after cleaning along with the exact number of duplicates removed, so you can measure the impact at a glance. It is perfect for deduplicating keyword lists, tag collections, or any text where accidental repetition crept in. If you need to remove duplicate lines rather than individual words, the Duplicate Line Remover is the right choice. To see how often each word appears before removing duplicates, try the Word Frequency Counter. All processing runs locally in your browser — your text stays private, and results appear instantly.
How to Use This Tool
- Paste or type your text into the input box above.
- Optionally enable case-sensitive comparison if "Word" and "word" should be treated as different.
- Review the cleaned text and the count of duplicates removed.
- Click "Copy Result" to copy the deduplicated text to your clipboard.
Examples
| Input | Output | Removed |
|---|---|---|
| "the cat sat on the mat" | "the cat sat on mat" | 1 |
| "red blue red green blue" | "red blue green" | 2 |
| "Hello hello HELLO world" | "Hello world" (case-insensitive) | 2 |
What This Tool Is Useful For
- Cleaning up keyword lists for SEO research where terms are accidentally duplicated.
- Deduplicating tags or categories pasted from multiple sources.
- Proofreading drafts to catch accidental word repetition.
- Preparing unique word lists for vocabulary study or flashcard creation.
- Reducing noise in brainstorming notes or meeting transcripts.
Frequently Asked Questions
- How does the tool decide which duplicate to keep?
- The tool keeps the first occurrence of each word and removes all subsequent duplicates. The original word order is preserved for the kept words.
- What counts as a word boundary?
- Words are split on any whitespace character, including spaces, tabs, and newlines. Punctuation attached to a word is considered part of that word, so 'hello' and 'hello,' are treated as different words.
- How does case-sensitive mode work?
- When case-sensitive mode is enabled, 'Hello' and 'hello' are treated as different words and both are kept. When disabled (default), they are considered the same word and only the first occurrence is kept.
- Does this tool work across line breaks?
- Yes. The tool treats the entire input as a single sequence of words regardless of line breaks. Duplicates are removed across the whole text, not just within individual lines.
- Can I remove duplicate lines instead of duplicate words?
- For removing duplicate lines, use the Duplicate Line Remover tool instead. This tool focuses specifically on individual words within your text.
More Text Tools
- All Text Tools — browse the full collection of text utilities
- Duplicate Line Remover — remove repeated lines instead of repeated words
- Word Frequency Counter — see how often each word appears in your text
- Word Counter — count words, characters, and reading time
- Find and Replace — search and replace text with regex support
Related Tools
Word Counter
Count words, sentences, and paragraphs in your text instantly.
Character Counter
Count characters with and without spaces for Twitter, SMS, and more.
Case Converter
Convert text between uppercase, lowercase, title case, and sentence case.
Slug Generator
Generate clean, URL-friendly slugs from any text string instantly.