Image Alt Text Checker Chrome Extension: Audit Image SEO on Any Page
Search Toolbox
SEO / GEO Editorial · tested in Chrome
Images are often the heaviest things on a page and the least documented. They arrive as IMG_8472-final-final.jpg, weigh more than the homepage copy, and carry an alt attribute that says “image”. This guide shows how to find missing alt text, separate decorative images from meaningful ones, and audit formats and dimensions without inspecting every element by hand.
Missing alt, empty alt and bad alt are three different problems
A meaningful image needs useful alternative text. A decorative image can intentionally use alt="" so assistive technology skips it. A missing attribute gives no explicit decision, while generic text such as “image” contributes almost nothing. Write for someone who cannot see the image but understands the page. Describe the information the image contributes in context. Do not repeat nearby text and do not turn the alt attribute into a suitcase full of keywords.
Alt text supports SEO, but it is not a magic ranking caption
Google uses alt text alongside computer vision and surrounding page content to understand an image. The filename, caption, nearby heading and page topic also provide context. That means a precise alt on an irrelevant page is not a shortcut to image visibility. Avoid keyword stuffing. Useful, concise descriptions help users and machines; awkward lists of synonyms make the experience worse and can look spammy. Human-first is not the opposite of SEO here — it is the implementation.
Audit dimensions, formats and weight alongside semantics
A page can have perfect alt text and still deliver a miserable image experience. Compare intrinsic dimensions with rendered dimensions, flag files much larger than their display size, and identify formats that can be modernized. Keep quality high while reducing unnecessary bytes. Responsive images need a reliable src fallback as well as srcset or picture sources. Search Toolbox lists the live image inventory so you can separate one-off editorial mistakes from a component shipping the wrong asset everywhere.
Turn a long list into a fixable workflow
Filter missing alt, review context, assign owners, then export the image list with URL and attributes. Fix the underlying CMS field or component before patching individual pages. Refresh and re-run the audit to prove the rendered output changed. For large sites, sample by template and image role: hero, product, editorial, icon and decorative asset. The goal is not 100% non-empty alt attributes. The goal is 100% intentional image behavior.
Search Toolbox · live panels
From missing alt to the component that caused it
The image panel finds the symptom; inspector, source, mobile preview and export help locate and fix the system behind it.
Swipe · tap to zoom
Keep diagnosing
Learn SEO / GEO the practical way
Audit a page, tab by tab.
A guided route from first observation to verification. Open the lesson to learn the method, or jump to its tool and inspect the active page.
- Step 01
Open the page and establish the baseline
Start on the live URL and record the final URL, HTTP response and indexability.
- Step 02
Check Overview, metadata and canonical
Resolve noindex, title, description, robots and canonical conflicts first.
- Step 03You are here
Audit headings, links and images
Read the hierarchy, follow internal anchors and fix repeated image-template errors.
- Step 04
Validate schema and entity relationships
Inspect the rendered JSON-LD graph, required properties and conflicting entities.
- Step 05
Verify hreflang and localized URLs
Test reciprocity, language codes, canonicals and HTTP status across the cluster.
- Step 06
Trace redirects and URL variants
Follow every hop and confirm the final URL is indexable and self-canonical.
- Step 07
Understand SSR, CSR and the rendering risk
Learn what the server sends, what JavaScript adds and which differences deserve investigation.
- Step 08
Investigate source HTML and rendered DOM if needed
Use this deeper check only when simpler panels reveal a JavaScript-related contradiction.
- Step 09
Prioritize, export, fix and retest
Turn evidence into an ordered plan, change one thing, then rerun the same checks.
Apply it to your site
Guide read. Now choose the real use case.
These workflows apply the method to real CMS failure modes and show which page and Search Toolbox panel to inspect next.
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Open workflowUsing another CMS or looking for one specific check?
The directory brings every use case, free tool and troubleshooting guide together.
FAQ and related searches
Frequently asked questions
How do you check image alt text on a page?
Inventory every image and classify it as informative, functional or decorative. Flag missing attributes, review empty alt text in context, and replace generic or keyword-stuffed descriptions with concise, useful alternatives.
Should decorative images have empty alt text?
Usually yes. Use alt="" so assistive technologies can skip purely decorative images. Meaningful images and image links need text that communicates their content or function.
What else should an image SEO audit check?
Review filenames, surrounding text, captions, intrinsic dimensions, rendered size, lazy loading, discoverability, file weight and modern formats such as WebP or AVIF. Alt text is only one part of image SEO.
Find the images your CMS forgot
Audit the live page, export the offenders and fix the component — because opening 84 image elements manually is not a personality trait.
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