Why Image SEO Matters
Most teams run SEO audits on page titles and meta descriptions, but images are often left untouched. That is a gap worth closing.
The numbers
Three stats frame the opportunity:
- 22% of web searches happen on Google Images - roughly 1 in 5 queries that could surface your content through visual results.
- 55% of sites ship pages with missing or empty alt text, leaving those images invisible to screen readers and search crawlers alike.
- 7,000+ additional visits can come from a properly optimized image library. Accurate filenames, compressed files, and descriptive alt text compound over time.
Why images get skipped
Image optimization is rarely urgent. Pages rank, load, and convert without it - until a competitor with better-optimized images starts appearing in visual carousels, Google Discover, and Lens results. By the time the gap shows up in analytics, it has been accumulating for months.
What to fix first
The highest-return fixes require no new content - just cleaner implementation.
1. Filename conventions
Search engines read filenames. IMG_2034.jpg tells a crawler nothing. warehouse-safety-inspection-checklist.webp tells it exactly what the image contains. Use lowercase, hyphen-separated words that describe the image in 3 to 7 words - no underscores, no camera defaults.
2. Alt text
Alt text is primarily an accessibility feature - read aloud by screen readers and displayed when images fail to load. Write it to describe the image accurately and concisely. Do not keyword-stuff it, and do not start with "image of" or "picture of". For infographics, describe what the data shows.
3. Format and compression
Serve photos and infographics as WebP where your pipeline supports it. For logos and icons, SVG scales without loss. Compress images before upload - uncompressed PNGs can weigh 5 to 10x more than they need to. Large images slow page load and push your LCP score up, which Google uses as a ranking signal.
4. Hero image loading
Your above-the-fold image is likely your Largest Contentful Paint (LCP) element. Set it to loading="eager" and add fetchpriority="high" so the browser prioritizes downloading it immediately. All other images below the fold should use loading="lazy".
5. Width and height in the markup
Without explicit width and height attributes on <img> elements, browsers cannot reserve space before the image loads - causing layout shift as the page reflows. Set attributes to match your intrinsic image size. Your CSS can still make the image responsive; the attributes just tell the browser what aspect ratio to expect.
A note on this infographic
The header image on this post is an AI-generated visualization created to illustrate the three statistics. The data points are real. The visual is a diagram, not a photo.
Getting started
Run a quick audit on your most-visited pages first. Look for missing alt text (browser DevTools or an SEO crawler will surface these quickly), oversized image files, and filenames still in camera default format. Those three fixes alone will put you ahead of the majority of sites that never touch their image optimization.
POPProbe's inspection workflows generate photo records at scale. Proper image naming and alt text inside those records improves the accessibility of your reports and their discoverability when shared externally. The same principles apply.