Accessible alternatives
Separate missing, empty and useful Alt text.
IMAGE SEO
What is an image SEO check?
An image SEO check reads image elements in a page's HTML and reviews alternative text, intrinsic dimensions, lazy loading and resource URLs. These signals help search engines understand images and give equivalent information to people who cannot see them.
An empty Alt is different from a missing Alt. Decorative images can use alt="", while informative images need useful descriptions. This report keeps the two cases separate.
Stable page layout
Check dimensions that help prevent layout shifts.
Crawlable resources
Find invalid URLs and HTTP images on HTTPS pages.
Why do image Alt text and dimensions matter?
Search engines use file names, surrounding copy and Alt text to interpret images, while browsers use intrinsic dimensions to reserve space. Poor settings weaken image visibility, accessibility and page experience.
Improve image understanding
Give important images concise descriptions that match page context.
Reduce layout shift
Reserve space before images load so content stays stable.
Find template-wide gaps
Locate missing Alt, invalid sources and insecure resources.
How does the image SEO checker work?
The server safely fetches the target page once and parses up to 200 image elements from the same HTML. It does not download every image.
- 01
Fetch final HTML
Validate the public URL and follow safe redirects.
- 02
Extract image attributes
Read src, data-src, alt, width, height and loading.
- 03
Apply transparent rules
Separate missing Alt, empty Alt, dimensions and URL problems.
- 04
Show itemized results
Filter affected images and follow specific fixes.
What makes image SEO effective?
Alternative text should clarify content, not repeat keywords. Loading optimization should not hide image resources from crawlers.
Describe informative images
Explain what the image contributes in context; avoid vague labels such as “image”.
Use empty Alt for decoration
Use alt="" for purely decorative images so assistive technology can skip them.
Declare stable dimensions
Provide width and height or an equivalent aspect ratio, then use responsive styling.
Treat above-the-fold loading carefully
Lazy load lower images, but avoid delaying a prominent hero or hiding its URL behind scripts.
Image SEO checker FAQ
Is empty Alt always an error?+
No. Purely decorative images should use empty Alt. Informative images need a readable equivalent.
How many keywords should Alt text contain?+
Describe the image naturally in its page context. Repetitive keyword stuffing does not improve quality.
Can lazy loading affect image indexing?+
Native loading="lazy" is generally crawlable. Keep the final image URL in accessible HTML and avoid unnecessary delay for the primary above-the-fold image.
Does the tool download or save images?+
No. It parses image attributes from the page HTML and does not write results to the database.
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Continue auditing page structure, links and broader SEO signals.