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Technical SEO · Images

Image SEO Analysis
Optimize Every Image for Search

TechySEO audits every image across your site for SEO and performance issues — missing alt text, over-length alt descriptions, images larger than 100KB, broken image URLs, missing dimension attributes, and decorative images incorrectly labeled with alt text.

Audit Image SEO← All Features
Why It Matters

Images Without Proper Optimization Hurt Rankings and Performance

Alt text is how search engines understand image content — without it, images contribute nothing to keyword relevance signals. For sites with hundreds or thousands of images, missing alt text represents a significant missed opportunity for topical relevance across page content. Google Images also drives meaningful organic traffic that's entirely unavailable to pages with missing or poor alt descriptions.

Oversized images (over 100KB) are a direct Core Web Vitals concern. Large images increase LCP (Largest Contentful Paint) scores and slow page load times — directly impacting Google's Page Experience signals. Images missing width and height attributes cause layout shifts during page load, increasing CLS (Cumulative Layout Shift) scores.

TechySEO's image audit identifies every image issue type across your full domain — so you can fix systematically rather than page by page.

🏷️
Missing Alt Text
Images without alt text are invisible to search engines — missing keyword relevance signals and image search traffic.
⚖️
Oversized Images
Images over 100KB slow page load times, increasing LCP scores and negatively impacting Page Experience rankings.
💔
Broken Image URLs
Images returning 404 show broken layouts to users and waste server requests during crawling.
📐
Missing Width/Height Attributes
Images without explicit dimensions cause layout shifts during page load, hurting CLS scores.
What It Checks

6 Image SEO Issue Types

A complete image audit covering SEO relevance, Core Web Vitals performance, and accessibility best practices.

🏷️
Missing Alt Text
All images missing an alt attribute — the most common and high-impact image SEO issue. Includes the image URL, containing page, and surrounding content for context when writing alt text.
✂️
Alt Text Over 100 Characters
Alt text exceeding 100 characters is often stuffed with keywords rather than descriptive — Google devalues overly long alt descriptions. Flags all images with excessively long alt text for trimming.
⚖️
Images Over 100KB
Images larger than 100KB that should be compressed, resized, or converted to a modern format like WebP or AVIF. Includes file size and image dimensions to help prioritize compression effort.
💔
Broken Image URLs
Image src attributes that return 404 or other error codes — causing visible broken image icons, degraded user experience, and wasted server requests during crawling.
📐
Images Without Width/Height Attributes
Images missing explicit width and height HTML attributes that cause layout shifts during page load — contributing to poor CLS scores that affect Google's Page Experience ranking signal.
🎭
Decorative Images With Alt Text
Purely decorative images should use alt="" (empty alt) so screen readers skip them. Decorative images with descriptive alt text create unnecessary noise for accessibility tools and can confuse topical relevance signals.
How It Works

Automated Image SEO Auditing

1
Crawler Extracts All Image Tags
Every <img> tag, background image reference, and srcset variation across all crawled pages is extracted and recorded with its full attributes — src, alt, width, height, and loading.
2
Image Resources Fetched for Size Check
TechySEO fetches image resources (or reads Content-Length headers) to determine actual file size — comparing against the 100KB threshold and flagging candidates for compression.
3
All 6 Issue Types Checked Per Image
Each image is simultaneously validated against all issue criteria. Results are grouped by issue type in the dashboard — so you can fix all "missing alt text" issues in a single focused workflow.
4
Export for Content Team Review
Image issues export as a CSV with image URL, page URL, issue type, and current alt text — making it easy for content teams to write corrected alt text in bulk outside the CMS.
Use Cases

Image SEO for Different Site Types

Content Sites
Reclaim Image Search Traffic
Content-heavy sites with dozens of images per article often have inconsistent alt text quality. TechySEO identifies every image without descriptive alt text — giving your content team a systematic list to update for better image search visibility and topical relevance.
eCommerce
Optimize Product Images at Scale
Product catalogs with thousands of images need systematic alt text and size management. TechySEO's image audit identifies product images missing alt text, oversized product photos hurting page speed, and broken product images causing frustrated shoppers.
Performance Optimization
Target Images Killing Core Web Vitals
TechySEO identifies images over 100KB on high-traffic pages — the images most likely to be your LCP element and most impactful to compress. Prioritize compression efforts based on page traffic and image file size to maximize Core Web Vitals improvements.
FAQ

Image SEO Analysis — FAQs

What is the ideal alt text length?
Good alt text is concise and descriptive — typically 10 to 50 words, written as a natural sentence describing what the image shows. The goal is to convey the image's meaning to someone who can't see it, while including naturally relevant keywords when appropriate. TechySEO flags alt text over 100 characters as a quality concern — beyond that length, alt text commonly becomes stuffed or reads as a keyword list rather than a genuine description.
Should decorative images have empty alt text?
Yes — decorative images like dividers, backgrounds, abstract patterns, and icon flourishes should use alt="" (an empty alt attribute, not a missing one). This tells screen readers to skip the image. A missing alt attribute is an accessibility error; an empty alt attribute is the correct signal for "this image adds no meaningful information." TechySEO can help identify decorative images with descriptive alt text that may warrant replacing with empty alt.
Why 100KB as the image size threshold?
100KB is a widely used practical threshold for web images — modern compression techniques (WebP, AVIF) and proper resizing should keep most web images well under this threshold. Larger images almost always indicate either incorrect format (JPEG at unoptimized quality), incorrect dimensions (serving 2000px images in 400px containers), or missing optimization. Images over 100KB on mobile pages are particularly impactful on LCP scores for users on slower connections.
Does TechySEO check images loaded via JavaScript or CSS?
TechySEO primarily analyzes HTML <img> tags and srcset values. Images loaded via CSS background-image or JavaScript (lazy-loaded images, carousel images) may have partial coverage depending on the site's JavaScript rendering requirements. For JavaScript-rendered images, TechySEO's rendering mode — which executes JavaScript before extracting content — provides better coverage than pure HTML parsing.
How does missing alt text affect Core Web Vitals?
Missing alt text doesn't directly affect Core Web Vitals scores (LCP, FID/INP, CLS) — those are performance metrics. However, missing width and height attributes on images directly cause Cumulative Layout Shift (CLS) problems, as browsers can't reserve space before the image loads. TechySEO's image audit captures both the SEO concern (alt text) and the performance concern (dimensions, file size) in a single comprehensive audit.

Find Every Image SEO Issue Across Your Site

TechySEO audits every image for missing alt text, oversized files, broken URLs, and dimension issues — giving your team a complete list to fix systematically.

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