# Alt-Text Checker > Agent-friendly Markdown of https://www.buildseo.org/free-tools/alt-text-checker — full index for AI agents: https://www.buildseo.org/llms.txt Find images missing alt text on any page. ## How it works Enter a URL and the checker fetches the page and inventories every `` element: which have alt text, which are missing the attribute entirely, and which are explicitly marked decorative with an empty alt, role="presentation", or aria-hidden. It separates the real failures (no alt attribute at all) from the intentional ones (decorative images that screen readers should skip), and flags low-value alt text like raw filenames that helps nobody. The per-image findings and coverage summary download as CSV or JSON, free and instant. ## Frequently asked questions ### Is an empty alt attribute a failure? No — alt="" is the correct convention for purely decorative images. It tells screen readers to skip the image. The failure is a missing alt attribute, which forces assistive tech to guess or read the filename aloud. ### Does alt text affect SEO or just accessibility? Both. Alt text is the primary signal image search indexes, it stands in for images that fail to load, and it is a WCAG requirement — the same fix serves rankings, resilience, and accessibility at once. ### What counts as low-value alt text? Filename-style values like IMG_1234.jpg or single characters. They technically pass an attribute check but describe nothing — the checker flags them so you can replace them with a short description of what the image shows. ## Accessible images. Authoritative site. BuildSEO AI wins the verified backlinks that make accessible pages rank. --- [All free tools](https://www.buildseo.org/free-tools.md) · [BuildSEO AI](https://www.buildseo.org/index.md)