The Alt Text Checker scans the HTML you paste and lists every image with its alt text status: missing, empty, too generic (such as "image" or a filename) or fine. Missing alt text hurts accessibility for screen-reader users and gives image search less to work with, and this shows you exactly which images to fix.
Made for marketers and seo. Typical uses:
It reads the HTML you paste and does not fetch live URLs or look at the images themselves, so it cannot tell whether a description is accurate. Images added by JavaScript after load appear only if you paste the rendered HTML.
Accuracy: Results show what the tool can measure at the moment you run it and can differ from what search engines see. Use them as guidance.
Explore more in SEO Tools, read the guides and articles, or see how we test our tools.
Check heading tag structure on any webpage.
Best for confirming a page has exactly one H1 before a content audit
Check canonical tags on any webpage to prevent duplicate content issues.
Best for verifying a migrated site's pages canonicalize to the correct new URLs
Validate JSON-LD and schema.org structured data for SEO.
Best for checking a Product schema has all required fields before a rich-result review
Check your website's SEO score with instant analysis of title, description, headings, and content.
Best for getting a baseline score for a new page before optimizing it further
Analyze text readability with Flesch Reading Ease score. Know your audience.
Best for checking a blog post's readability before publishing to make sure it matches your audience's reading level