Image Alt Tag Checker for Better Image SEO & Accessibility
Enter a live page URL to review its images with Wranker’s image ALT text checker. Find missing ALT attributes, review empty values in context, and flag files above your chosen size limit where size data is available.
One Page
One live URL per check
ALT Review
Check attributes and values
File Size
Flag files above your limit
Check Image Alt Text, Image SEO & File Signals in One Audit
Use this image alt text checker to review missing or empty alt attributes, image file signals, and technical image details so content, SEO, and development teams can prioritize the right fixes.
Use the image alt tag checker during on-page SEO reviews, content QA, website migrations, landing page updates, and broader website SEO audits.
Review Missing and Empty ALT
Identify images with no ALT attribute or an empty value. Review flagged images alongside their surrounding content before deciding whether a description is needed.
Flag Images Above Your Size Limit
Highlight files above your selected size limit when size data is available. Keep unknown sizes separate from confirmed large-image findings.
Review WebP Opportunities
Identify non-WebP images for a format review. Compare file size, visual quality, and required features before deciding whether conversion would help.
Inspect Responsive and Lazy-Loading Sources
Review the selected srcset candidate and image URLs in data-src or data-lazy-src when enabled. Check the sources detected by the tool.
Why Use an Image ALT Tag Checker?
Use Wranker’s image ALT text checker to focus your team’s attention on images that need review. Plan clearer descriptions and file-size improvements using findings from one live page.
Help Search Engines Understand Your Images
Review whether important images have useful descriptions that match the page’s subject. Relevant ALT text gives search engines more context about what those images show.
Support Screen-Reader Users
Review which screenshots, charts, or product images need useful text alternatives. Help visitors understand essential visual information without having to see the image.
Find Opportunities to Reduce Page Weight
Use available file-size findings to select images for compression or resizing. Prioritise potential savings while preserving readable screenshots and useful visual detail.
From Page URL to Actionable Image Alt & SEO Findings
Enter a page URL, run the check, and review image alt text, file, format, and technical findings in one focused workflow. Use the results to identify issues and prepare practical fixes.
Enter the Page URL
Enter the URL of the page you want to check. The image alt tag checker analyzes images on that page only.
Configure Image Check Settings
Choose the file-size threshold and decide whether to check srcset, lazy-loaded image sources, and redirected image URLs.
Run the Image Alt Check
Wranker analyzes the page and reviews detected images for alt attributes, file size, image format, and other available image signals.
Review Your Image Audit Results
Review the Overview, Missing ALT, Large Images, WebP Opportunities, and Fix Pack to prioritize image improvements and prepare your next actions.
Use an Image Alt Tag Checker Across Your SEO & Content Workflows
Use the image alt tag checker before publishing important pages, during on-page SEO reviews, or whenever image-heavy pages need a focused quality check.
Before publishing an image-heavy page, use the Image Alt Tag Checker to review alt attributes, image files, and optimization opportunities, then move on to broader SEO checks.
Review Blog Images Before Publishing
Use an image alt text checker to review article images for missing alt attributes and large files before publishing.
Check Landing Page Images Before Launch
Check hero images, screenshots, product visuals, and other page images before launching campaigns or updating key landing pages.
Review Image Text Alternatives
Identify images that may need meaningful text alternatives, while giving reviewers context for decorative images that may appropriately use empty alt attributes.
Find Images Adding Page Weight
Identify large image files and format opportunities that may benefit from compression, resizing, or more efficient delivery.
Continue Your Image and Page SEO Review
After using the image ALT tag checker, review your page’s wider SEO signals, social preview images, HTTPS resources, and performance with these focused tools.
PAGE-LEVEL SEO
Website SEO Analyzer
Review metadata, headings, links, and indexing instructions alongside your image findings. Analyse one page in greater detail without starting a full website crawl.
OpenSOCIAL PREVIEW IMAGES
Open Graph Checker
Review the declared sharing image, title, and description. Check whether the page references the image you intend to use in social link previews.
OpenHTTPS IMAGE RESOURCES
Mixed Content Scanner
Scan your domain’s HTTPS pages for HTTP image references and other insecure resources. Use the selected scan scope to locate URLs that need review.
OpenPAGE PERFORMANCE
Core Web Vitals Checker
Review loading, responsiveness, and layout stability for mobile or desktop. Use available real-user data and clearly labelled fallback diagnostics to investigate beyond image file size.
Frequently Asked Questions About Image Alt Tag Checkers
Get clear answers about image alt tags, alt text, image SEO, accessibility, and image file checks.
An image alt tag checker is a tool that scans images on a webpage and identifies issues with their alt attributes. It can help find missing or empty alt attributes and give you a starting point for reviewing image accessibility and SEO.
An image alt text checker analyzes the images and HTML on a webpage to identify images with missing or empty alt attributes. Some tools also review related image signals, such as file size, format, lazy-loading attributes, and srcset information.
Enter the page URL into an alt tag checker or website image alt text checker and run the analysis. The results can show which images need further review so you can update their alt attributes directly on your website.
An image alt tag checker tool can detect missing or empty alt attributes and help identify images that require review. Depending on the tool, it may also check image file weight, formats, srcset candidates, lazy-loaded image sources, and other technical image signals.
Some image alt tag checker online tools are available for free, although their features and scan limits can vary. A free tool can be useful for checking individual pages without committing to a larger site-wide crawling platform.
No. An empty alt="" attribute can be correct when an image is purely decorative, or its information is already provided by nearby text. Informative and functional images generally need an appropriate text alternative, so the image's purpose and context should be reviewed before changing an empty alt attribute.
Good alt text should communicate the meaning or function of an image in its page context using concise, useful wording. It should not simply describe every visual detail or add unnecessary terms such as “image” or “picture” unless they are relevant.
An alt text checker can help you identify images that need review, making it easier to improve text alternatives and image-related accessibility issues. Appropriate alt text also helps search engines understand images and their context, but automated checking cannot determine whether every alt description is meaningful without human review.
Yes. Some image alt checker and alt tag checker tools combine alt-attribute checks with image file analysis. Wranker's audit can also identify images above a selected file-size threshold and surface format or delivery opportunities for further review.
You should prioritize important pages such as landing pages, blog posts, product or service pages, and image-heavy content. An alt tag checking tool, alt image checker, or img alt checker can provide a quick page-level QA step before publishing or after significant content changes.
Check image ALT text and file weight before publishing
Enter a live page URL to find missing ALT text, heavy images, unknown file sizes, and WebP opportunities.
Use the Fix Pack and exports for content QA, accessibility review, developer handoff, and image SEO improvements.