Alt Text Checker - Free SEO Tool for Image Accessibility & Optimization

Alt Text Checker

Check and analyze alt text attributes for accessibility, SEO optimization, and WCAG compliance

Check by URL
Check HTML Code

Example URLs:

https://www.example.com https://blog.example.com/article https://shop.example.com/products

Example HTML with good alt text:

<img src="cat-playing.jpg" alt="Brown tabby cat playing with a red ball" width="800" height="600"> <img src="company-logo.png" alt="Example Corp - Professional Web Solutions"> <img src="decorative-border.jpg" alt=""> <!-- Decorative image -->

Analyzing images and alt text...

Alt Text Best Practices

Be Descriptive

Describe the image content and function. For a search button image: alt="Search" instead of alt="Magnifying glass".

Keep It Concise

Aim for 5-15 words or 125 characters maximum. Screen readers may cut off longer descriptions.

Include Keywords

Incorporate relevant keywords naturally, but avoid keyword stuffing. Focus on user experience first.

Decorative Images

Use empty alt text (alt="") for purely decorative images that don't convey meaningful content.

Linked Images

For images that are links, describe the link destination, not just the image itself.

SEO Benefits

Good alt text improves image search rankings and provides context to search engines.

Accessibility

Alt text is essential for screen reader users and is required by WCAG 2.1 accessibility standards.

Context Matters

Consider the image's context in the surrounding content. The same image may need different alt text in different contexts.

The Ultimate Guide to Alt Text & Image SEO

Images are a vital part of the web experience, but search engines like Google and screen readers for the visually impaired cannot "see" them like humans do. This is where Alt Text (Alternative Text) comes in. Our Alt Text Checker tool scans your webpage or HTML code to ensure every image has a descriptive tag, boosting both your SEO rankings and web accessibility.

Why is Alt Text Critical?

Missing alt attributes are one of the most common Web Accessibility (WCAG) failures. Fixing them offers three major benefits:

Anatomy of a Perfect Image Tag

A properly formatted image tag includes the source, the alternative text, and optionally, dimensions and a title.

<img src="blue-running-shoes.jpg" alt="Pair of blue Nike running shoes on a track" width="800" height="600">

3 Golden Rules for Writing Alt Text

  1. Be Specific: Don't just say "shoes". Say "blue running shoes with white laces".
  2. Context Matters: If an image of a magnifying glass is used as a search button, the alt text should be "Search", not "Magnifying glass".
  3. Don't Be Redundant: Never start with "Image of..." or "Picture of...". Screen readers already announce that it is an image.
Pro Tip: For purely decorative images (like borders, spacers, or background flourishes), use an empty alt attribute (alt=""). This tells screen readers to skip the image entirely.

How to Use This Tool

Simply enter the URL of any live webpage, or paste your HTML Source Code directly. Our tool will parse the data and generate a detailed report highlighting: