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Image Optimization for SEO
Speed up your site and rank higher with properly optimized images.
Images make up a large part of page weight. Optimized images load faster, improve user experience, and help you rank better. NakedURL checks alt text, lazy loading, and file sizes automatically.
80%
of page weight is images
30s
Audit duration
4
Image checks
100%
Free always
Key Findings
Image format (WebP) medium
1. Why Image Optimization Matters
Large images slow down your site, hurting user experience and Core Web Vitals. Google uses page speed as a ranking factor. Optimized images also improve accessibility via alt text and help you appear in image search.
2. The Four Pillars of Image SEO
NakedURL checks four areas: Alt text – descriptive text for accessibility and context; Lazy loading – defers off‑screen images; Modern formats – WebP or AVIF offer better compression; File size – compress images without losing quality.
3. How to Improve Your Image Score
Use tools like TinyPNG or ImageOptim to compress images. Implement lazy loading with loading="lazy". Convert to WebP. Write descriptive alt text that includes relevant keywords.
- Always add alt text to every image
- Use loading="lazy" on images below the fold
- Serve images in WebP format (fallback to JPEG/PNG)
- Keep file size under 150KB for regular images
⚠️ The Problem
Unoptimized images are the #1 cause of slow pages
- Missing alt text – poor accessibility and image search ranking
- No lazy loading – longer initial load time
- Outdated formats (JPEG, PNG) – larger file sizes
- Overly large images – wasted bandwidth
✅ NakedURL Solution
NakedURL scans your images and gives clear fixes
- Detect missing alt text and suggest improvements
- Check for lazy loading attribute
- Identify large images and recommend compression
- Advise on converting to WebP/AVIF
Key Features
Alt text check
See which images lack alt text and get tips on writing good ones.
Lazy loading scan
Find images that are not lazy‑loaded and slow down initial paint.
Format detection
Check if you are using modern formats like WebP.
File size analysis
Identify oversized images that hurt load speed.
I have alt text on all images, but my score is still low. Why?
Check file size and format. Even with alt text, large images slow you down. Convert to WebP and compress. NakedURL will show you which images are heaviest and give you a file size threshold.
Frequently Asked Questions
What is NakedURL and how does it work?
NakedURL is a free SEO and GEO audit tool that checks 60+ metrics on any website. It analyses meta tags, readability, backlinks, structured data, AI readiness, and more – all in under 30 seconds.
Is NakedURL really free?
Yes. NakedURL is completely free with no sign‑up or credit card required. You get full access to all 60+ checks and insights.
How can I use AI to improve my SEO?
Run an audit, then copy the recommendations and paste them into your preferred LLM (ChatGPT, Claude, etc.) with a prompt asking for specific code or content changes for your framework.
How long does the audit take?
Most audits complete in 10‑30 seconds. The time depends on your server speed and the complexity of your site.
Do I need to create an account?
No. NakedURL requires no registration. Just enter a URL and get your report instantly.
What is GEO and why does it matter?
GEO (Generative Engine Optimization) optimises your content for AI search engines like ChatGPT and Perplexity. It involves llms.txt, question headings, FAQ schema, and allowing AI bots.