Image SEO in 2025: How to Optimise Visual Content for Google

In 2025, image SEO isn’t just a nice-to-have—it’s a ranking factor, user experience enhancer, and traffic generator rolled into one. With visual search growing and page speed more critical than ever, poorly optimised images can quietly sabotage your website’s performance.

In this guide, we’ll break down how to make your images work harder for your SEO strategy, covering everything from filenames and alt tags to structured data and compression. Let’s get into it. 🖼️

🔍 Why Image SEO Still Matters

Google increasingly uses images to inform AI-generated answers and search overviews. Image-heavy results often dominate mobile search, and visual content appears in featured snippets, carousels, and Google Discover.

Getting your images right can lead to:

• Higher visibility in Google Images
• Better accessibility for screen readers
• Faster page load times and improved Core Web Vitals
• Enhanced E-E-A-T signals when used properly

📝 Step 1: Name Your Files Properly

Google reads image filenames, so never upload images with default names like IMG_1234.jpg. Instead, use descriptive, keyword-relevant names separated by hyphens.

Bad: IMG_834.png
Good: modern-dental-clinic-warsaw.jpg

🦯 Step 2: Write Useful Alt Text

Alt text isn’t just for accessibility—it helps search engines understand your images. Write concise, meaningful alt attributes describing the content and purpose of the image.

Best practices:

• Keep it under 125 characters
• Describe what’s in the image, not just why it’s there
• Don’t stuff keywords—be natural and useful

⚡ Step 3: Compress Without Losing Quality

Large image files are a leading cause of slow load times. Use modern formats like WebP or AVIF and compress your images using tools like:

• TinyPNG
• Squoosh
• ImageOptim (Mac)

Fast-loading images contribute directly to Core Web Vitals and can affect your rankings in mobile search.

🧠 Step 4: Use Structured Data for Rich Results

If your images support products, recipes, articles, or reviews, consider using structured data to help Google understand their context. This includes:

• ImageObject schema for images
• Product or Article schema if the image supports key content

Example:

{
  "@context": "https://schema.org",
  "@type": "ImageObject",
  "contentUrl": "https://example.com/images/seo-guide-cover.jpg",
  "description": "Cover image for The SEO Guide Book 2025",
  "name": "SEO Guide Book Cover"
}

📱 Step 5: Make Sure Images Are Responsive

In 2025, mobile-first indexing means mobile-friendly images are a must. Use srcset and sizes attributes to serve images appropriate to device size.

📈 Step 6: Track Image Performance

Use Google Search Console to monitor impressions, clicks, and appearance in Google Images. You’ll find this under Performance > Search Type: Image.

Evaluate which image pages drive traffic and identify opportunities for further optimisation.

📌 Final Tips for Better Image SEO

• Use descriptive <figcaption> elements under important images
• Add image sitemaps for large image-heavy sites
• Keep decorative images out of SEO-critical areas
• Minimise lazy-loading delays for images above the fold

“Strong image SEO doesn’t just help you rank—it improves speed, structure, and user trust across the board.”
— David Roche