Image alt-text audit

What this tool checks

Alt text is the written description assigned to an image through the HTML alt attribute; this checker scans every image on a page you enter and flags the ones that are missing it, left it empty, ran it too long, or reused the raw filename. Screen readers, Google Images, and AI answer engines all rely on that text to understand a picture they cannot see, so when it is absent or junk the image becomes invisible to them and the page loses accessibility, image-search traffic, and the context that helps a model cite you.

What it looks at

Missing alt attribute

An <img> with no alt at all, which makes screen readers announce the filename or nothing and leaves the image meaningless to search crawlers and AI models.

Empty alt (alt="")

A blank alt marks an image as purely decorative and hides it from assistive tech, which is correct for spacers and background flourishes but wrong for a content image that actually informs the reader.

Filename-as-alt

Alt text like IMG_2043.jpg or hero-final-v2 is the file's name rather than a description, so it passes a naive has-alt test while telling a human, crawler, or model nothing.

Overly long alt

Alt text that runs to a full paragraph is tiring to hear read aloud and dilutes the keywords, whereas a concise description of roughly under 125 characters reads and indexes better.

Coverage across the page

The share of images on the URL that carry usable alt text, since a single missing description can break the accessibility of an otherwise clean page.

Descriptive specificity

Whether the alt names what is actually shown, such as bar chart of 2025 SEO budgets, versus a generic label like image or photo, because specific alt feeds image search and gives an LLM real context.

How to use it

1. Paste your page URL into the checker and run the scan.
2. Review the flagged images grouped by issue: missing, empty, filename-as-alt, and over-long.
3. Fix the alt in your CMS or template with a short, specific description of each content image, then re-run to confirm zero flags.

Frequently asked questions