What Is Alt Text and Why It Matters for SEO and Accessibility
Every image on a website needs a short written description. That description is called alt text, and it does two things at…
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SEO Tool
Image Alt Text & Alt Tag Checker
The free alt text checker scans a page or a whole website for images missing alt attributes and empty alt text. It lists every image with a thumbnail preview, a status badge (missing / empty / present), and the pages each image appears on. Filter, fix, and export the results as CSV or JSON.
Guide
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.
Find Every Image Missing Alt Text
Missing alt text quietly hurts two things at once: screen reader users lose the meaning of your images, and you skip a free image-SEO opportunity. This alt text checker scans a single page or a whole website, lists every image it finds, and flags the ones with a missing or empty alt attribute so you can fix them fast.
If a tool like Lighthouse told you “the images on this page are missing alt attributes”, paste the page URL here to see exactly which images it means. Each result shows a thumbnail, the image URL, and a clear status badge: missing (no alt attribute at all), empty (alt="", correct only for decorative images), or present (has a real description). Filter to just the problems and export the full list as CSV or JSON for your team.
Everything runs in your browser, so the page you scan and its content stay on your device, nothing is uploaded to a server. Run it before every content audit and you usually find dozens of one-line fixes that lift image-search traffic right away. New to alt text? Read our guide on what alt text is and how to write it, then come back and clear every flag.
Benefits
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.
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FAQ
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.
What does "the images on this page are missing alt attributes" mean?
That warning, from Lighthouse and other accessibility audits, means one or more image tags on the page have no alt attribute at all. Screen readers then read the file name instead of a description. Paste the page URL into this alt text checker to see exactly which images are missing alt text, then add a short description to each.
How do I check the alt text on a web page?
Paste the page URL into the checker above and run the scan. It lists every image on the page with a thumbnail, shows whether each alt is missing, empty, or present, and shows the pages each image appears on. Everything runs in your browser, so the URL and page content stay local.
How do I fix images that are missing alt text?
Open the page in your CMS, select each flagged image, and add a short, specific description in its alt field. For purely decorative images, set an empty alt attribute instead. Re-run the checker to confirm every image now shows a present or intentionally empty status.
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