How to Fix Missing Alt Tags on Images for SEO

Images play a major role in modern SEO, but many websites fail to optimize them properly. One of the most common technical issues is missing alt tags on images. Alt tags, also known as alt attributes or alternative text, help search engines understand image content and improve accessibility for users. Fixing Missing tags in image is a critical step in improving on-page SEO, image search visibility, and overall site quality.

This guide explains what alt tags are, why missing alt tags harm SEO, and how to fix them correctly using best practices.

What Are Alt Tags in SEO?

Alt tags are HTML attributes added to image elements to describe the image content. They appear when an image fails to load and are read by screen readers for visually impaired users.

Example:

<img src="seo-image.jpg" alt="SEO optimized image example">

When alt text is absent, the image becomes invisible to search engines. This is where missing alt tags create SEO gaps.

Why Missing Alt Tags Hurt SEO

Search engines cannot “see” images the way humans do. They rely on text-based signals. Missing tags in image cause multiple SEO problems:

1. Poor Image Search Rankings

Images without alt text struggle to rank in Google Image Search.

2. Accessibility Issues

Screen readers depend on alt text. Missing tags in image reduce website accessibility compliance.

3. Weak Keyword Signals

Alt text contributes to keyword relevance. Missing attributes mean lost optimization opportunities.

4. Lower Page Quality Signals

Search engines view Missing tags in image as incomplete on-page optimization.

How to Identify Missing Alt Tags

Before fixing missing alt tags, they must be identified. Common methods include:

1. Manual Page Inspection

Right-click on images and inspect HTML to check for missing alt="" attributes.

2. SEO Audit Tools

Tools like Screaming Frog, Ahrefs, SEMrush, or Sitebulb can scan pages and report Missing tags in image in bulk.

3. Google Search Console

Pages flagged for accessibility or usability issues often include missing image attributes.

Read more: How to Fix Poorly Optimized Meta Descriptions

How to Fix Missing Alt Tags on Images

1. Add Descriptive Alt Text

Each image should have a clear, concise description explaining what the image shows.

Bad:

<img src="image.jpg" alt="">

Good:

<img src="image.jpg" alt="SEO audit dashboard showing missing alt tags report">

This directly resolves missing alt tags issues.

2. Use Keywords Naturally

Include relevant keywords only when they accurately describe the image. Avoid keyword stuffing.

Correct:

alt=”infographic explaining missing alt tags in SEO”

Incorrect:

alt=”missing alt tags missing alt tags SEO missing alt tags”

Search engines penalize unnatural usage even when fixing Missing tags in image.

3. Avoid Generic Alt Text

Text like “image,” “photo,” or “picture” adds no SEO value.

Weak alt text:

alt=”image”

Optimized alt text:

alt=”website SEO checklist highlighting missing alt tags”

4. Decorative Images Should Use Empty Alt

Not all images require descriptive text. Decorative elements should use empty alt attributes to maintain accessibility.

Example:

<img src="divider.png" alt="">

This prevents screen readers from reading irrelevant content while still addressing Missing tags in image correctly.

5. Fix Alt Tags in CMS Platforms

WordPress

• Open Media Library
• Select image
• Add Alt Text field
• Update image

Many WordPress sites suffer from missing alt tags due to rushed uploads.

Shopify

• Open product image
• Edit alt text field
• Save changes

HTML Websites

Edit <img> tags directly in source code.

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Best Practices for Writing Alt Text

To fully resolve Missing tags in image, follow these best practices:

• Keep alt text under 125 characters
• Describe image context, not just appearance
• Match page topic relevance
• Write for humans first, search engines second
• Never duplicate alt text across different images

Common Mistakes When Fixing Missing Alt Tags

1. Keyword Stuffing

Adding keywords without relevance reduces SEO quality.

2. Duplicate Alt Text

Every image should have unique alt text.

3. Ignoring Functional Images

Icons like buttons or links must have alt text describing their function.

Example:

alt=”download SEO checklist PDF”

How Missing Alt Tags Affect Core Web Vitals and UX

While alt tags do not directly impact loading speed, Missing tags in image affect user experience and accessibility metrics. Google increasingly factors usability signals into rankings. Proper image optimization supports long-term SEO health.

Do Alt Tags Affect Rankings Directly?

Alt tags are not direct ranking factors, but they contribute to:

• Image search traffic
• Page relevance
• Accessibility compliance
• On-page SEO completeness

Fixing missing alt tags strengthens multiple indirect ranking signals.

Checklist to Fix Missing Alt Tags

• Audit entire site
• Identify images without alt attributes
• Write descriptive, relevant alt text
• Avoid generic or stuffed keywords
• Update CMS or HTML files
• Re-crawl site to confirm fixes

Conclusion

Missing alt tags are a common yet easily fixable SEO issue. With RR Seo Experts, descriptive alt text to images, websites improve accessibility, image search visibility, and overall on-page SEO quality. Search engines reward completeness and usability, and fixing Missing tags in image closes a critical optimization gap. Regular image audits ensure long-term SEO stability and better user experience.