Duplicate Content Across Languages
A problem where content in different languages is seen by Google as duplicate. Solved via hreflang and unique content.
On this page
What is duplicate content across languagesWhy the problem occursHow Google detects duplicatesSolution: hreflangAdditional measuresCheckingIn brief
Duplicate Content Across Languages occurs when similar (e.g., machine‑translated) or identical texts in several languages confuse the search engine, so it may not show the correct version to the user.
What is duplicate content across languages
The problem of duplicated content between language versions. Solved via hreflang and unique content.
Why the problem occurs
- Machine translation — low quality, similar structure
- Mixed content — part translated, part in English
- Missing hreflang — Google doesn't understand these are translations
- Identical images — with English text across all languages
How Google detects duplicates
- Textual content analysis
- HTML structure comparison
- Checking hreflang tags
- Content language analysis
Solution: hreflang
HTML
<!-- On the English version -->
<link rel="alternate" hreflang="en" href="https://example.com/en/page" />
<link rel="alternate" hreflang="ru" href="https://example.com/ru/page" />
<link rel="alternate" hreflang="de" href="https://example.com/de/page" />
<!-- On the Russian version (same on all) -->Additional measures
- Quality translation — not machine
- Unique meta tags — Title, Description per language
- Image localisation — text on images translated
- Canonical — self‑referencing to the current language version
Checking
GSC — duplicate content reports. Screaming Frog — duplicate detection. Copyscape — uniqueness check.
Even with correct hreflang, try to avoid full content duplication. Create unique texts for each language with cultural and query‑specific nuances.
FAQ
Common questions
Yes. Without hreflang, Google may accidentally show the Russian version to a German user or treat pages as duplicates. hreflang is essential for multilingual sites.
Use hreflang with different attributes: en‑US, en‑GB, en‑AU. For search engines these are different target audiences, even if content is the same. Also set country targeting in GSC.
Google may recognise machine translation by n‑gram statistics and lower the indexing quality of such pages. Invest in professional translation.
Yes, if images contain text. Google does not translate text inside images, so a user from another country will see an incomprehensible caption. Identical alt texts can also create duplication.
Check that hreflang is reciprocal (links back) and that all versions are accessible via separate URLs. Ensure content differs significantly (e.g., different paragraph order, different examples).
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