B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
31.3%
31.3% -- share of web images with missing or inadequate alt text for web images (2025)
31.3% of web images use missing or inadequate alt text according to the WebAIM Million report.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
31.3%
Unit
Percentage
Data Vintage
2025
Entity
Sample Size
1,000,000
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
WebAIM
Primary
Tier B
https://keywordly.ai/blog/how-to-optimize-blogs-for-seo-complete-guide-and-tips ↗
Source Article
How to Optimize Blogs for SEO, Complete Guide and Tips
Imagine pouring hours into crafting what seems like the perfect blog post, only to watch it disappear into Google’s second page—or worse. Many teams wrestle with the challenge of turning diligent research and creativity into content that actually ranks and drives results. Even the most talented writ…
Original Research
WebAIM
· Original study ↗
Methodology
WebAIM Million report (analysis of one million homepages), as cited by Keywordly
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
web images: 31.3% share of web images with missing or inadequate alt text. Source: WebAIM (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/webaim-missing-alt-text-31-3-percent
HTML Embed
<blockquote cite="https://lighthousedata.io/data/webaim-missing-alt-text-31-3-percent" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>31.3%</strong> -- share of web images with missing or inadequate alt text for web images<br><small>Source: WebAIM (2025) · <a href="https://lighthousedata.io/data/webaim-missing-alt-text-31-3-percent" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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