Alt Text Checker
Check the alt attributes in your HTML images and quickly identify missing, empty, weak, or overly long alternative text that may need improvement for accessibility and image SEO.
Check Your Image Alt Text
Paste HTML containing your image tags and analyze the alt attributes.
What Is Alt Text?
Alt text, also called alternative text, is text associated with an
HTML image through the alt attribute. It provides a
textual description or alternative for an image when the image
cannot be used or when its meaning needs to be communicated in text.
Well-written alternative text can help make meaningful images more understandable to people using assistive technologies and can also provide useful context about images within a webpage.
How to Use the Alt Text Checker
- Copy the HTML from the page or section you want to inspect.
- Paste the HTML into the checker.
- Click Check Alt Text.
- Review the number of images analyzed and the status of their alt attributes.
- Inspect individual image entries to find missing, empty, short, or overly long alt text.
- Update the original HTML where improvements are needed.
What the Checker Looks For
Missing Alt Attribute
Identifies image elements that do not contain an alt attribute.
Empty Alt Text
Identifies images where the alt attribute exists but contains no text.
Very Short Alt Text
Flags descriptions that may provide too little information for meaningful content images.
Long Alt Text
Flags unusually long descriptions that may be difficult to use efficiently.
Descriptive Alt Text
Identifies alt text that passes the basic length and presence checks used by this tool.
Image Source
Shows the image source associated with each detected image so you can identify which element needs attention.
Why Alt Text Matters
Images can communicate information that is not available from nearby text alone. Providing appropriate alternative text gives content authors a way to communicate the purpose or meaning of relevant images in text form.
Alt text is also part of the broader image optimization workflow. Checking image HTML before publishing can help identify overlooked image attributes and improve the consistency of content across a site.
Examples of Alt Text
<img src="mountain-hiking.jpg"
alt="Hiker walking along a mountain trail at sunrise">
The description communicates useful information about the image rather than simply repeating a generic image label.
Example 2 — Missing alt attribute:
<img src="mountain-hiking.jpg">
The image has no alt attribute and will be reported as missing.
Example 3 — Empty alt attribute:
<img src="mountain-hiking.jpg" alt="">
The alt attribute exists but contains no text. Whether an empty alt attribute is appropriate depends on the image's role.
Decorative Images and Empty Alt Text
Not every image needs a descriptive text alternative. Some images are purely decorative and do not add meaningful information to the surrounding content. In appropriate cases, an empty alt attribute can be intentional.
The checker therefore reports empty alt text so you can review it; an empty attribute is not automatically an error for every type of image. The context and purpose of the image should determine the appropriate treatment.
Common Alt Text Mistakes
- Leaving meaningful images without an alt attribute.
- Using an empty alt attribute for an image that communicates important information.
- Using vague descriptions such as "image" or "picture" without useful context.
- Repeating surrounding text unnecessarily in the alt attribute.
- Writing excessively long descriptions when a concise description would communicate the image's purpose more effectively.
- Treating every image as identical instead of considering whether it is informative, functional, or decorative.
Alt Text and Image SEO
Alternative text is one part of an overall image SEO workflow. Images can also be improved through descriptive filenames, appropriate dimensions, suitable formats, captions where useful, and relevant surrounding content.
Alt text should describe the image or its purpose naturally rather than being written primarily to insert keywords. The goal is useful, relevant information rather than keyword stuffing.
Who Can Use the Alt Text Checker?
Bloggers
Review images in blog posts before publishing and identify missing or weak alt attributes.
SEO Professionals
Quickly inspect image markup while reviewing on-page and technical content optimization.
Web Developers
Inspect image elements in HTML and locate alt attributes that require further review.
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Frequently Asked Questions
What does an Alt Text Checker do?
It examines image elements in supplied HTML and reports whether alt attributes are present, empty, very short, or unusually long.
Why should images have alt text?
Appropriate alternative text can provide a textual representation of meaningful image content or purpose and support accessibility.
Is empty alt text always wrong?
No. Empty alt text can be intentional for decorative images. The correct choice depends on the purpose and context of the image.
What makes good alt text?
Good alt text is relevant to the image's purpose, concise, clear, and useful to someone who cannot access the image itself.
Should keywords be added to alt text?
Alt text should describe the image naturally. Keywords should not be inserted unnecessarily or repeated simply for SEO purposes.
Can I check multiple images at once?
Yes. Paste HTML containing multiple image elements and the checker will analyze the detected images individually.
Does the checker analyze the actual image?
No. The checker analyzes image elements and their HTML attributes. It does not determine whether an alt description accurately matches the visual content of an image.
Improve Your Image Content Workflow
Check your image HTML, identify alt text issues, and explore more SEO and content tools from AISkillsUp.
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