Image Alt Text Checker

Find every image on a webpage missing alt text. Missing alt tags hurt your SEO rankings and fail accessibility standards fix them all in one go.

Why use our Image Alt Text Checker

Instant image alt text audit

Scan every image on a page and see which ones are missing alt attributes in seconds, no need to inspect page source image by image.

Free alt text checker, no signup

Check missing alt tags online without an account or credit card, unlike full-site auditing tools that lock this behind a paywall.

Distinguishes missing vs. empty alt

Correctly tells apart a missing alt attribute (an error) from an intentional empty alt="" on decorative images, so you only fix real issues.

Unlocks Google Image Search traffic

Properly alt-tagged images can drive 20–30% of organic traffic for image-heavy sites, this tool finds every missed opportunity on the page.

Website URL *

Why alt text matters for SEO

Google can't see images: Googlebot reads alt text to understand what an image shows. Without alt text, your image contributes zero SEO value and won't rank in Google Images.

Empty alt vs. missing alt are different: An empty alt="" is intentional: it tells screen readers to skip the image (correct for decorative images). A missing alt attribute is an error: the image has no description at all.

Accessibility = SEO signal: Google's helpful content guidelines reward accessible pages. Pages that fail WCAG accessibility standards (including missing alt text) perform worse in rankings.

Image search is real traffic: Properly alt-tagged images appear in Google Image Search. For e-commerce, blogs, and recipe sites, Google Images can drive 20–30% of total organic traffic.

Real Image Alt Text Checker example: before vs. after

A recipe blog post's images, before and after fixing missing alt text.

Before · Missing alt text

hero-banner.jpg → no alt attribute
step-3-photo.jpg → no alt attribute
final-dish.jpg → alt="IMG_4471"
divider.svg → alt="" (correct, decorative)

3 content images have no useful alt text, invisible to Google Image Search and screen readers alike, a missed traffic opportunity.

After · Alt text added

hero-banner.jpg → "Creamy garlic pasta in a white bowl"
step-3-photo.jpg → "Adding parmesan to the sauce"
final-dish.jpg → "Finished garlic pasta, top-down view"
divider.svg → alt="" (correct, decorative)

Descriptive, keyword-relevant alt text on every content image, now eligible to appear in Google Image Search results.

Frequently Asked Questions

What is image alt text?

Alt text (alternative text) is an HTML attribute that describes the content of an image. It's used by screen readers for accessibility and by search engines to understand image content.

Does alt text affect SEO rankings?

Yes. Alt text helps Google understand your images, which can improve rankings for both regular search and Google Image Search. Missing alt text is a missed ranking opportunity.

What makes good alt text?

Describe the image accurately in 5–15 words. Include your target keyword naturally if it's relevant to the image. Don't start with 'Image of' or 'Picture of', that's redundant.

Should decorative images have alt text?

No. Decorative images (dividers, backgrounds, icons) should use empty alt="" to tell screen readers to skip them. Only meaningful, content images need descriptive alt text.