Quick answer
Duplicate content means two or more URLs expose substantially similar content. It is a diagnosis problem, not automatic proof of a penalty: product variants, print views, parameters, and syndicated material may be intentional.
What the issue means
NOTABIS compares normalised page content across the pages it crawled. Small template differences may not make pages meaningfully distinct, while a shared layout alone does not prove duplication.
Why it matters for SEO
When several indexable URLs represent the same subject, search systems may have to choose which URL to show and signals can be split. The practical concern is clarity: one preferred page, coherent internal links, and consistent sitemap and canonical signals.
How NOTABIS detects it
The duplicate-content rule groups crawled pages whose normalised content matches. The report shows affected pages, but the result is limited to the crawled response and does not decide whether the pages have different business purposes.
How to check it yourself
Compare the affected URLs side by side. Check headings, main copy, canonical URLs, indexability, parameters, language, product choices, and whether each URL has a distinct search intent.
How to fix it
If pages are accidental duplicates, consolidate them and redirect retired URLs where appropriate. If variants should remain accessible, use coherent canonical and indexability rules. If pages are intended to rank separately, add genuinely useful subject-specific content rather than cosmetic wording.
When it may be intentional
Duplicates can be reasonable for print views, tracking variants, filtered navigation, translated or regional pages, and syndicated content. Make the intended relationship explicit and do not remove useful URLs merely to eliminate a report finding.
Related issues
Review duplicate titles, duplicate descriptions, canonicals, and sitemap-only pages together.
Run a NOTABIS audit
Run an audit to group the measured duplicate pages and inspect the evidence before deciding whether consolidation is appropriate.