The alt attribute helps explain an image when the user cannot see it and when a search engine needs to understand what it adds to the content.

In this visual guide you will see a demo mini page, the broken HTML and the recommended fix.

Visual guide

Spot an important image without alt text

Walk through a mini page, inspect the issue as a user, open the code and compare the correct solution.

demo-page.html

DEMO PAGE

Dental whitening in Barcelona

Image without alt

Before and after treatment

The user sees a relevant treatment image, but the HTML does not explain what it represents.

Do all images need alt?+

All images should have an alt attribute, but not all need text. Decorative images can use empty alt.

Does alt text help SEO?+

Yes. It gives visual context, improves accessibility and can help image search.

Can I add many keywords to alt text?+

No. Alt text should describe the image naturally. Keyword stuffing can reduce content quality.

What happens if an important image has no alt?+

The page loses semantic clarity. Screen reader users miss that information and search engines understand the image less clearly.

What does UOPIX detect?+

UOPIX can detect images without alt text, relevant images with empty alt text and patterns where visual content is not explained clearly.

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