You run an SEO audit and discover an hreflang language mismatch warning. However, when you check your website, everything seems normal. Your English page has an English tag, and your French page has a French tag.
So, what went wrong?
In many cases, the problem isn’t the hreflang tag itself. Instead, the tag may point to the wrong page, use an incorrect language code, or reference content that hasn’t been translated properly.
Fortunately, most of these issues are easy to investigate once you know where to look.
In this guide, you’ll learn how to identify hreflang language mismatch errors, understand their causes, and fix them without disrupting your international SEO setup.
What Is an Hreflang Language Mismatch?
An hreflang language mismatch occurs when a page’s declared language or regional targeting doesn’t match the destination page as expected.
For example, imagine your website has two pages:
https://example.com/en/services/ — English version
https://example.com/fr/services/ — French version
However, your English page contains this tag:
The tag declares a French alternative, but the URL points to the English page.
As a result, the annotation doesn’t represent the intended language version.
An SEO crawler may report this as a language mismatch.
However, not every warning means Google has rejected your hreflang configuration. Sometimes, automated tools incorrectly identify a page’s language.
Therefore, always investigate the actual page before making changes.
Why Do Hreflang Language Mismatch Errors Happen?
Several problems can trigger these warnings. Fortunately, most fall into a few common categories.
Incorrect Language or Country Codes
A page may use en-UK instead of en-GB, for example.
Although the intention is clear, GB is the correct region code for the United Kingdom.
Wrong Alternate URLs
Sometimes, an hreflang tag points to the wrong translation.
For instance, a French annotation might accidentally link to the English version.
Incomplete Translations
A translated page may contain a French heading but English body content.
Consequently, an SEO auditing tool might detect English as the page’s primary language.
Redirected Pages
An alternate URL might redirect visitors to a page in another language.
As a result, the final destination no longer matches the declared hreflang value.
Incorrect Page Mapping
Multilingual websites sometimes connect unrelated pages.
For example, an English product page might point to a French category page instead of the equivalent product.
Now that you understand the common causes, let’s examine how to fix them.
Step 1: Find the URL Causing the Error
First, open your SEO audit report and locate the affected URL.
Most auditing tools identify the source page, destination URL, or both.
For example:
Source page
Hreflang value
Destination
/en/services/
fr-FR
/fr/services/
/en/services/
de-DE
/de/services/
/en/services/
en-GB
/en/services/
The third row deserves investigation.
If the English page targets a general international audience, en-GB might not reflect its intended regional targeting.
However, if the page specifically serves UK visitors, the value may be appropriate.
Therefore, check the destination before changing the annotation.
Ask yourself:
Is the page written in the intended language?
Does it target the correct audience?
Is the translation complete?
Does the URL redirect?
Does the page match the original topic?
Once you’ve identified the problem, move to the next step.
Step 2: Verify the Hreflang Language Codes
Next, check whether your language and region codes are correct.
Hreflang values typically include a language code and, optionally, a region code.
Here are some common examples:
Target audience
Correct value
English speakers
en
United States English
en-US
United Kingdom English
en-GB
French speakers
fr
Canadian French
fr-CA
German speakers in Germany
de-DE
Traditional Chinese
zh-Hant
For example, en-UK is not the correct way to target British English. Instead, use en-GB.
Similarly, US alone doesn’t identify a language.
However, remember that a language and a country aren’t the same thing.
An English page targeting Canada can correctly use en-CA.
If you’re unsure about the syntax, use the Free Hreflang Tag Generator to prepare and check your annotations.
Nevertheless, correct syntax alone doesn’t guarantee that the destination page is properly localized.
Step 3: Compare the Tag With the Actual Page Content
After checking the language code, open the destination URL.
For example, suppose this annotation appears on your website:
At first glance, everything looks correct.
However, the destination might contain a French heading while the pricing details and FAQs remain in English.
As a result, an auditing tool may report a language mismatch.
To investigate, review the main content carefully.
Check the headings, paragraphs, navigation, forms, product descriptions, and other important text.
In addition, inspect content loaded dynamically after the page opens.
If the page is intended for French-speaking visitors, its primary content should serve that audience.
Therefore, the best solution may be to finish the translation rather than change the hreflang tag.
Remember: A /fr/ URL doesn’t automatically make a page French.
Step 4: Check the HTML Language Attribute
Next, inspect the HTML lang attribute.
For example, a French page might incorrectly contain:
A more suitable declaration would usually be:
The HTML language attribute helps browsers and accessibility technologies understand the document’s language.
However, it serves a different purpose from hreflang.
Google primarily determines a page’s language from its visible content rather than relying on the HTML lang attribute.
Therefore, an incorrect HTML language declaration is worth fixing, but it doesn’t automatically prove that the hreflang tags are wrong.
If you use WordPress, check your multilingual plugin, theme, and site-language configuration.
Step 5: Check for Redirects
Sometimes, the hreflang annotation points to a URL that redirects elsewhere.
For example:
However, /de/products/ might redirect to /en/products/.
Consequently, visitors expecting German content reach an English page.
To fix this, check the final destination of the alternate URL.
If the German page has moved, update the hreflang annotation to its new location.
On the other hand, if the German page no longer exists, review whether it should remain in the alternate-language group.
Whenever possible, point hreflang annotations directly to the intended final URLs.
Also, avoid redirecting every missing translation to the homepage. An unrelated homepage usually isn’t a useful replacement for a missing product or service page.
Step 6: Review Canonical Tags
Hreflang and canonical tags work together, but they have different purposes.
Hreflang identifies language and regional alternatives.
Meanwhile, canonical tags indicate the preferred URL when pages contain duplicate or substantially similar content.
For example, imagine these two translated pages:
https://example.com/en/contact/
https://example.com/fr/contact/
However, the French page contains:
This configuration may conflict with the intention to keep the French translation independently available in search results.
For separately indexable translations, a self-referencing canonical is often appropriate.
For example:
Nevertheless, canonical decisions can be more complicated for nearly identical regional pages written in the same language.
Therefore, review each situation before making changes.
You can use the Degates Canonical Tag Generator to create canonical markup after identifying the preferred URL.
Step 7: Check Whether the Pages Are Equivalent
Another common issue is incorrect URL mapping.
For example, consider a multilingual online store.
English page
French page
Relationship
/en/shoes/
/fr/chaussures/
Correct if equivalent
/en/shoes/
/fr/jackets/
Incorrect
/en/contact/
/fr/contact/
Correct if equivalent
The second example is a problem because the pages discuss different products.
Hreflang should connect equivalent content intended for different audiences.
Therefore, don’t generate alternate URLs from a naming pattern without checking the actual pages.
Instead, create a simple URL mapping sheet.
Include each original page and its corresponding translations.
Then, verify that every URL leads to the correct content.
This approach is especially helpful for websites with hundreds of translated pages.
Step 8: Inspect the Published Hreflang Tags
After correcting the URLs, inspect the markup that your website actually publishes.
Don’t rely only on your WordPress settings.
For example, an English and French guide might use these annotations:
Both pages should include the appropriate alternate-language relationships, including their own entries.
In addition, check the XML sitemap if that’s where your hreflang annotations are implemented.
For a broader explanation of correct implementation, read our Hreflang Tags Guide.
You can also use the Degates Hreflang Tag Generator to generate and check supported HTML or XML annotations.
However, checking pasted markup doesn’t automatically verify the live page’s content, indexability, or reciprocal tags.
Therefore, inspect the published URLs as well.
Step 9: Apply the Correct Fix
Once you’ve identified the cause, choose the appropriate solution.
Problem
Recommended fix
Incorrect language code
Replace it with the intended supported code
Wrong destination URL
Link to the correct translation
Incomplete translation
Finish localizing the content
Redirected alternate URL
Update the annotation to the correct final URL
Conflicting canonical
Review the canonical configuration
Incorrect HTML language
Correct the HTML lang attribute
Missing reciprocal tags
Update the relevant alternate pages
False-positive warning
Document the evidence and avoid unnecessary changes
Most importantly, don’t apply the same fix to every warning.
For example, changing a language code won’t solve an incomplete translation.
Similarly, updating the translation won’t fix a redirect pointing to the wrong page.
Instead, match the solution to the confirmed problem.
Step 10: Test Your Changes
Finally, validate the affected pages after making corrections.
Start by checking whether the destination URLs load successfully.
Next, confirm that the updated hreflang tags appear in the published HTML, HTTP headers, or XML sitemap, depending on your implementation.
Then, review canonical tags and indexability.
You can also use Google Search Console to inspect important localized URLs.
However, Search Console doesn’t currently provide a dedicated, comprehensive hreflang validation report.
Therefore, combine URL inspection with manual checks or a suitable technical SEO crawler.
Afterward, monitor impressions and landing-page performance by country.
Keep in mind that Google may need time to recrawl and process your changes.
A corrected hreflang configuration doesn’t guarantee an immediate ranking increase.
How to Prevent Hreflang Language Mismatch Errors
Fixing an error is useful. However, preventing it from returning is even better.
Multilingual websites change frequently. New pages appear, translations are updated, and old URLs are redirected.
Therefore, make hreflang checks part of your regular publishing workflow.
Review Every New Translation
Before publishing, confirm that the translated page matches the original topic.
Also, verify its language code and intended audience.
Check URLs After Website Updates
Whenever you change a URL, update its hreflang relationships.
Otherwise, annotations may continue pointing to outdated destinations.
Audit Your Multilingual Pages Regularly
Run periodic checks after major content updates, migrations, or multilingual plugin changes.
For more common problems, see our guide to 7 Hreflang Implementation Mistakes.
Frequently Asked Questions
What causes an hreflang language mismatch?
An hreflang language mismatch can result from incorrect locale codes, wrong alternate URLs, incomplete translations, redirects, or incorrect page mapping.
However, automated language detection can sometimes produce false-positive warnings.
Can hreflang language mismatch errors affect SEO?
Yes. Incorrect annotations can make it harder for Google to understand the intended relationships between localized pages.
As a result, users may see a less suitable language or regional version in search results.
However, an hreflang warning doesn’t automatically mean your website will lose rankings.
Is en-UK a valid hreflang code?
No. For English content targeting the United Kingdom, use en-GB.
The GB region code represents the United Kingdom.
Is the HTML lang attribute the same as hreflang?
No. The HTML lang attribute describes the document’s language for browsers and accessibility technologies.
Meanwhile, hreflang identifies alternate URLs intended for different language or regional audiences.
Can WordPress cause hreflang language mismatch errors?
Yes. Incorrect multilingual plugin settings, translation mappings, redirects, or outdated sitemap entries can create problems.
Therefore, always inspect the published markup instead of relying only on plugin settings.
How can I check hreflang tags for free?
You can manually inspect your HTML and XML sitemap.
Alternatively, use the Free Hreflang Tag Generator by Degates to generate and check supported hreflang markup.
However, remember to verify live URLs and their actual content separately.
Final Thoughts
An hreflang language mismatch warning doesn’t always mean your entire international SEO setup is broken.
In many cases, the problem comes from a single incorrect code, outdated URL, incomplete translation, or mismatched page relationship.
Therefore, begin with the affected URL and investigate the actual cause.
Next, apply the smallest appropriate correction.
Finally, validate the published markup and monitor the results.
By following this approach, you can maintain a more reliable multilingual website without making unnecessary technical changes.
If you need help preparing hreflang annotations, try the Degates Free Hreflang Tag Generator before implementing them on your website.
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