Image Alt Tag Checker Online Free

Audit a page or whole website for missing and empty alt text. Crawl your site, list every <img> with thumbnail preview, status badge (missing / empty / present), and the pages each image appears on. Filter, fix, and export the results as CSV or JSON.

How to Audit Image Alt Tags

1

Enter Your URL

Paste any webpage URL into the input field.

2

Watch the Live Crawl

Watch the live crawl as the tool checks every image alt attribute.

3

Filter, Fix, Export

Filter by missing alt and export the audit results as CSV.

Image Alt Tag Checker Online Free

Boost Image SEO and Accessibility

Missing alt text hurts accessibility and skips a free SEO opportunity. The crawler checks every image on every page and lists the ones with empty or missing alt attributes, ready for a quick fix.

Run it before every big content audit and you usually find dozens of one-line fixes that improve image-search traffic immediately.

Why Use Our Image Alt Tag Checker?

Three-Way Status Detection

The tool distinguishes the three real states of alt text: Missing (the <img> has no alt attribute at all, fail), Empty (alt="", intentional for decorative images, fine), and Present (real text, good). Each result is color-badged so you can spot real accessibility problems vs. legitimate decorative images at a glance.

Single Page or Whole Site

Audit one URL or run a breadth-first crawl across up to 100 internal pages. The same image used on multiple pages is deduped to one row in the report, but the Found On column lists every page it appears on, so you can fix the alt once at the source and resolve every page-level instance.

Smart Filtering

After the scan finishes, filter the result table by Issues only (default, missing + empty), Missing alt only, Empty alt only, With alt, or All. Each filter renders only the matching rows so you can focus on what needs fixing without scrolling through the entire site catalog.

Thumbnail Preview

Each row shows a 56-pixel thumbnail of the actual image alongside its URL, so you can immediately see which photo is missing alt text without having to copy the URL or open it in a new tab. Lazy-loaded for fast rendering on large reports.

Frequently Asked Questions

Common questions about auditing image alt text.

What is the difference between missing and empty alt?
Missing means the <img> tag has no alt attribute at all, this is a real accessibility failure. Screen readers fall back to the image filename, which is rarely meaningful. Empty means the image explicitly has alt="", a deliberate signal that the image is decorative and should be ignored by assistive tech. Empty is correct usage when the surrounding text fully describes the content; missing is always a bug.
Why does Google care about alt text?
Alt text is the primary signal Google uses to understand image content for ranking in Google Images. It also feeds into the page’s topical relevance, descriptive alt text on relevant images can lift the parent page’s rank in regular search. From an SEO standpoint, missing alt is a missed opportunity; from an accessibility standpoint, it is a barrier for users who cannot see the image.
Why are some images missing from the report?
The tool only sees images that are present in the static HTML at fetch time. Lazy-loaded images using data-src are picked up; images injected by JavaScript after page render (Vue, React, etc.) are not visible to the server-side fetch. For JS-heavy sites, run a desktop crawler with headless rendering for full coverage.
Is my data stored?
No. The crawl runs entirely server-side per request, no database write, no logging of URLs you submit, no account required. The CSV/JSON exports are generated client-side from the result data and saved straight to your downloads folder.
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