SEO issue types - All detectable problems explained
Missing title tag
criticalmetaPage has no title tag
1
Invalid JSON in structured data
criticalstructured dataStructured data contains invalid JSON syntax
2
4XX client error
criticaltechnicalPage returns 4XX HTTP status code
3
5XX server error
criticaltechnicalPage returns 5XX HTTP status code
4
No SSL certificate
criticaltechnicalPage is not served over HTTPS
5
Homepage missing from sitemap
criticaltechnicalThe website homepage (root URL) is not included in the sitemap
6
Duplicate title
highmetaMultiple pages share the same title tag
7
Missing meta description
highmetaPage has no meta description
8
Canonical URL mismatch
highmetaCanonical URL points to a different page than expected
9
Missing meta viewport
highmetaPage has no viewport meta tag
10
Missing H1 tag
highcontentPage has no H1 heading
11
Empty H1 tag
highcontentH1 tag exists but has no text content
12
Invalid structured data
highstructured dataStructured data has syntax errors
13
Structured data missing @type
highstructured dataStructured data object is missing @type property
14
Required structured data type missing
highstructured dataPage is missing a required structured data type for its content
15
Not mobile friendly
hightechnicalPage lacks viewport meta tag
16
Title not in document head
highmetaThe page title is not in the HTML head; we found a title elsewhere (e.g. in the body). Search crawlers typically only read the head.
17
Title too short
mediummetaTitle is less than 55 characters
18
Meta description too short
mediummetaMeta description is less than 120 characters
19
Duplicate meta description
mediummetaMultiple pages share the same meta description
20
Missing canonical tag
mediummetaPage has no canonical URL specified
21
HTML lang and OG locale mismatch
mediummetaHTML lang attribute and og:locale meta tag do not match
22
Multiple H1 tags
mediumcontentPage has more than one H1 heading
23
Missing H2 tag
mediumcontentPage has no H2 heading
24
Empty H3 tag
mediumcontentH3 tag exists but has no text content
25
No internal links
mediumcontentPage has no internal links to other pages
26
Missing OG title
mediumogPage has no og:title meta tag
27
Missing OG description
mediumogPage has no og:description meta tag
28
Missing OG image
mediumogPage has no og:image meta tag
29
OG image invalid dimensions
mediumogog:image does not meet minimum dimensions (1200x630)
30
OG image not accessible
mediumogThe og:image URL cannot be fetched (returns error, timeout, or non-200 status)
31
Product schema missing price
mediumstructured dataProduct schema lacks price information
32
Product schema missing image
mediumstructured dataProduct schema lacks image property
33
Article schema missing date
mediumstructured dataArticle schema lacks datePublished
34
Article schema missing author
mediumstructured dataArticle schema lacks author property
35
Structured data type does not exist
mediumstructured dataSpecified schema type is not a valid schema.org type
36
Important internal link is nofollow
mediumlinksHigh-value internal link has rel="nofollow"
37
Slow page load
mediumtechnicalPage takes more than 3 seconds to load
38
Image missing alt text
mediumimagesImage lacks alt attribute
39
Non-HTML content type
mediumtechnicalThis URL returns a non-HTML content type. Standard XML sitemaps should only contain URLs that serve HTML pages. Non-HTML resources like images, PDFs, or JSON files should use dedicated sitemap extensions or be removed.
40
Structured data disconnected groups
mediumstructured dataStructured data entities form multiple disconnected groups instead of one linked graph
41
Title too long
lowmetaTitle exceeds 60 characters and will be truncated in search results
42
Meta description too long
lowmetaMeta description exceeds 160 characters
43
Missing favicon
lowmetaPage has no favicon (icon link tag)
44
Missing Apple touch icon
lowmetaPage has no Apple touch icon link tag
45
Missing web app manifest
lowmetaPage has no manifest link tag
46
H1 too long
lowcontentH1 exceeds 70 characters
47
H2 too long
lowcontentH2 exceeds 70 characters
48
H3 too long
lowcontentH3 exceeds 60 characters
49
Broken heading hierarchy
lowcontentHeadings skip levels (e.g., H2 → H4)
50
OG image wrong size
lowogog:image aspect ratio is not optimal (recommended 1.91:1 ratio, e.g., 1200x630px)
51
OG image missing alt text
lowogog:image has no og:image:alt attribute
52
Missing Twitter card
lowogPage has no twitter:card meta tag
53
Missing Twitter image
lowogPage has no twitter:image meta tag
54
Missing OG locale
lowogPage has no og:locale meta tag
55
Missing OG type
lowogPage has no og:type meta tag
56
Missing OG URL
lowogPage has no og:url meta tag
57
Missing OG site name
lowogPage has no og:site_name meta tag
58
Missing OG image width
lowogPage has no og:image:width meta tag
59
OG image width too small
lowogog:image:width is less than 1200px
60
Missing OG image height
lowogPage has no og:image:height meta tag
61
OG image height too small
lowogog:image:height is less than 630px
62
FAQ schema has too few questions
lowstructured dataFAQPage schema should have at least 2 questions
63
Generic anchor text
lowlinksInternal link uses generic anchor text like "click here" or "read more"
64
Duplicate anchor text
lowlinksSame anchor text points to multiple different URLs, which can confuse users and search engines
65
Sitemap invalid lastmod format
lowtechnicalSitemap lastmod value is not in valid date format
66
Sitemap invalid changefreq value
lowtechnicalSitemap changefreq value is not valid
67
Sitemap invalid priority value
lowtechnicalSitemap priority value is not between 0.0 and 1.0
68
Image alt text too long
lowimagesAlt text exceeds 125 characters
69
Page set to noindex
infometaPage has robots meta tag with noindex directive
70
Page set to nofollow
infometaPage has robots meta tag with nofollow directive
71
Missing meta keywords
infometaPage has no meta keywords tag
72
Missing link author
infometaPage has no author link tag
73
Missing H3 tag
infocontentPage has no H3 heading
74
Thin content
infocontentPage has less than 300 words
75
Missing OG image type
infoogPage has no og:image:type meta tag
76
No structured data
infostructured dataPage has no structured data markup
77
Missing breadcrumb schema
infostructured dataPage lacks BreadcrumbList schema
78
Too many links
infolinksPage has more than 100 links
79
Isolated page
infolinksPage has no outgoing internal links and does not distribute link equity
80
Over-optimized anchor text
infolinksPage has multiple links with identical or very similar keyword-rich anchor text (over-optimization)
81
URL too long
infotechnicalURL exceeds 100 characters
82
URL has query parameters
infotechnicalURL contains unnecessary query parameters
83
Sitemap missing lastmod
infotechnicalSitemap URL entry has no lastmod attribute
84
Sitemap missing changefreq
infotechnicalSitemap URL entry has no changefreq attribute
85
Sitemap missing priority
infotechnicalSitemap URL entry has no priority attribute
86
Image format not optimized
infoimagesImages not in WebP, AVIF, or PNG could be replaced for better compression.
87
Outdated year references
infofreshnessContent mentions old years (e.g., 2022, 2023)
88