Finding Repeated Sentences in Your Content
Paste your content and this tool finds every sentence appearing more than once, showing how many times each repeats and which sentence positions they occupy. Comparison ignores case and extra whitespace, so near-identical repeats are still caught.
Word-for-word repetition inside a single document is almost always accidental. It creeps in when content is assembled from several sources, when a template is reused, or when a long piece is edited over time by more than one person.
Where repeated sentences come from
- Content merged from two drafts or two older articles, where both contained the same explanation.
- Templated pages — location or product pages where only a name changes between them.
- Copy-paste editing, where a sentence is duplicated during a restructure and the original never removed.
- AI-assisted writing, which tends to restate points across sections.
- Long documents edited over months, where a definition gets re-explained because nobody remembered it was already there.
Why it matters
The clearest cost is to the reader. Encountering the same sentence twice in one article is a small jolt that undermines confidence in the writing — it signals the piece was assembled rather than written, and readers notice even when they cannot articulate why something feels sloppy.
It also wastes space. A repeated sentence is length that contributes nothing, which matters if you are trying to keep a page tight, and matters more if the repetition is filling space where genuinely new information should be.
The SEO angle is real but modest. Internal repetition does not trigger any penalty, and Google handles it without difficulty. What it can indicate is thin content padded to look substantial, which is a quality problem rather than a duplication one.
How the matching works
Sentences are split on terminal punctuation, then compared after lowercasing and collapsing whitespace. That means “The tool is free.” and “the tool is free.” are treated as duplicates, which is usually what you want.
It is exact matching beyond that normalisation. A sentence with one word changed is not flagged, because near-duplicate detection at sentence level produces too many false positives to be useful — legitimate writing repeats sentence structures constantly.
Sentence splitting uses punctuation, so abbreviations like “Dr.” or “e.g.” can create artificial sentence boundaries. In a document dense with abbreviations you may see fragments listed rather than whole sentences.
Deciding what to fix
Not every repeat is a mistake. A short call to action repeated at the top and bottom of a page is deliberate. A defined term restated in a summary section can be intentional reinforcement. Repetition in a FAQ answer that mirrors the body text is often fine, since readers may only read one of them.
What is usually worth fixing is a substantive explanatory sentence appearing twice in the flowing body copy, particularly when the two occurrences are close together. That is almost always an editing artefact rather than a choice.
The positions shown next to each duplicate help here. Two occurrences at sentence 4 and sentence 96 are probably an intro and a conclusion echoing each other. Occurrences at sentence 22 and 25 are an editing mistake.
Related checks
For whole repeated blocks rather than single sentences, the Duplicate Paragraph Finder works the same way at paragraph level — useful after merging documents, where entire sections get duplicated.
For repeated phrasing rather than repeated sentences — the same construction reused with different words around it — the N-gram Analyzer surfaces repeated three and four-word sequences, which is where monotonous writing shows up.
And for comparing two separate documents rather than looking inside one, the Text Similarity Checker scores overall overlap between them.
Using it in an editing workflow
- Run it after merging two drafts, which is when duplication is most likely.
- Run it on long-form content before publishing, where repetition is hardest to spot by rereading.
- Run it on templated pages to see how much text is identical between them.
- Run it on AI-assisted drafts, which frequently restate the same point across sections.
- Skip it for short pages, where repetition is easy to catch by reading.
Frequently asked questions
Does repeated content inside one page hurt SEO?
Not directly, and there is no penalty for it. Google handles internal repetition without difficulty. The real cost is to readers, and heavy repetition can signal thin content padded to look longer.
Does it catch sentences that are only slightly different?
No, matching is exact after lowercasing and collapsing whitespace. Near-duplicate detection at sentence level produces too many false positives, since legitimate writing reuses sentence structures constantly.
Why are fragments showing instead of full sentences?
Sentence splitting uses terminal punctuation, so abbreviations like “Dr.” or “e.g.” create artificial boundaries. Text dense with abbreviations produces fragments rather than complete sentences.
Is repetition ever intentional?
Often. Calls to action repeated at top and bottom, a defined term restated in a summary, or an FAQ answer mirroring body text are all reasonable. The positions shown help you tell deliberate echoes from editing mistakes.
Is my content uploaded anywhere?
No. The analysis runs entirely in your browser and nothing is transmitted or stored, so it is safe for unpublished drafts and client work.