Image Alt Text Checker

Audit every image on any webpage for missing, empty, or overly long alt texts. Improve your SEO and accessibility in seconds.

Enter a Page URL to Check
Common SEO Issues Recommendations
Alt text too long
  • Keep it short. Use 125 characters or less.
  • Skip filler phrases like "a photo of" or "an image of"
  • Say what matters most — describe the main subject only
Missing Alt text
  • Write a short description of what the image shows
  • Keep it under 125 characters
  • Add one keyword if it fits — don't force it
  • For decorative images, use alt="" so screen readers skip them

Why Alt Text Matters for SEO?

Search engines don’t actually see images the way people do. They depend on surrounding signals to figure things out. Alt text is one of those signals.

A strong description ties the image back to the topic of the page. It prevents the image from feeling random or disconnected. Search engines notice that relationship.

Sometimes that added context helps an image show up more clearly in search results. Other times, the impact is subtle. Still, missing descriptions rarely improve anything.

Google reviews alt text during indexing. If it’s vague or missing, useful context disappears. Over time, small gaps like that can affect how clearly a page is understood. Tools that scan alt text make those gaps easier to spot.

Alt Text and Web Accessibility

For someone using a screen reader, alt text becomes the explanation of the image. It replaces what others can see instantly.

If it’s not there, the experience changes. The reader may skip the image. Or it might read the file name aloud, which usually doesn’t help.

Accessibility standards such as WCAG 2.1 expect meaningful images to include descriptive alt text. Decorative images are treated differently. Those should use an empty alt attribute (alt="") so assistive tools move past them.

Images without alt text often trigger accessibility warnings. Tools like Lighthouse flag them during audits. Checking alt attributes regularly helps avoid those issues.

How to Use the Image Alt Text Checker?

Using the tool is straightforward.

  • Paste the full page URL into the input field.
  • Click Check URL to begin the scan.
  • The tool loads the page and reviews every image tag it finds.
  • Results appear in grouped sections: All Images, Alt Missing, Warnings, and Success.
  • You can filter results by searching for specific alt text or image URLs.
  • Click Show HTML if you want to see the raw image tag.
  • If needed, download the full report as a CSV file for further review.

Understanding the Result Categories

Success

The image includes alt text with a clear and relevant description. It usually stays within about 125 characters, which works well for accessibility and SEO.

Alt Missing

The image tag has no alt attribute at all. Search engines receive little context. Screen readers may behave unpredictably. These should be addressed first.

Warnings (Alt Text Too Long)

The alt text exceeds the recommended length. Long descriptions can feel awkward and harder to follow. In most cases, trimming the text improves clarity.

Decorative

The image uses an empty alt attribute (alt=""). This is correct when the image exists only for layout or visual styling. Assistive tools and search engines ignore these.

Best Practices for Writing Alt Text

Describe What Is Visible

Focus on what the image actually shows. Keep it simple and direct.

Keep It Concise

Around 125 characters is usually enough. Longer descriptions tend to lose focus.

Use Keywords Naturally

If a keyword fits the image, include it. There’s no need to force extra terms.

Skip Redundant Phrases

Starting with “Image of” or “Picture of” is unnecessary. The context already implies that.

Use Empty Alt for Decorative Images

Images used only for spacing or design should use alt="". That keeps assistive tools from reading irrelevant content.

Include Alt Text for Functional Images

Logos, buttons, icons, and infographics still need descriptions. They serve a purpose, so they should be explained.

Common Alt Text Mistakes to Avoid

No Alt Attribute

Leaving out the alt attribute is the most common issue. Every meaningful image should include one.

Alt Text That Is Too Long

Very long descriptions can feel unnatural. They may also look like keyword stuffing. Clear and focused wording works better.

Generic Descriptions

File names such as “image1.jpg” or vague words like “photo” provide no helpful meaning. Be specific.

Keyword Stuffing

Repeating the same keyword multiple times looks unnatural. Use relevant terms once, if they fit.

Missing Alt on Infographics

Infographics often contain text and data that search engines cannot read inside the image itself. Alt text should briefly explain the main idea or message of the graphic.

Frequently Asked Questions

Missing alt text means search engines cannot understand your images, which limits your visibility in image search results. It is a missed SEO opportunity rather than a direct penalty, but fixing it consistently improves rankings over time.

Most screen readers and SEO guidelines recommend keeping alt text under 125 characters. This is enough to describe most images clearly without being overly verbose or appearing as keyword stuffing.

No. Purely decorative images should use an empty alt attribute (alt="") so screen readers skip them. Adding descriptive text to decorative images interrupts the experience for visually impaired users without adding real value.

This tool is purpose-built for quickly auditing image alt text on any public page. It shows every image with its alt status, character count, and raw HTML in a simple card layout. You can search, filter, and download results as CSV without installing any browser extension.

Yes. After the check completes, click the Download CSV button to export all image data including the URL, alt text, status, and character count as a CSV file.