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Image SEO Checker

Free, no signup. Audit image SEO signals visible in raw HTML. Rendered dimensions, real LCP, transfer sizes, and AI alt-text generation are shown honestly as unavailable in this tool.

Built by Patrick Stox

Checks run from our server; we fetch the URL you enter and don't keep the results. Anonymous run-level outcome counters may be used for aggregate research; URLs, domains, IPs, and identifiers are never included, and no statistic is released below 100 runs.

Feedback
Report a bug

Found something broken in Image Seo Checker? Let us know what happened — this goes straight to a private triage queue, not a public list.

What will be sent 
 No tool inputs, uploads, pasted source, complete results, query parameters, or URL fragments are attached automatically. You can edit or remove the selected passage above. Browser and anti-abuse metadata is processed for spam prevention. 
  
 
  
 
 
  
 
 
  
 
 
Sample report
Illustrative example — based on the markup shown
<img src="hero.jpg">
<img src="divider.svg" alt="" loading="lazy">
<img src="chart.webp" alt="Quarterly traffic by channel" width="960" height="540">
  • Review: hero.jpg has no alt attribute.
  • Observed: divider.svg has empty alt text, which may be correct for decoration.
  • Observed: chart.webp supplies descriptive alt text and dimensions.
  • Not evaluated: actual transfer sizes, rendered dimensions, and the page's LCP element.
 
 
 
How to use it
  1. Enter the public URL containing the images you want to review.
  2. Choose Audit images and inspect each evidence-backed raw-HTML check.
  3. Separate missing alt attributes from intentionally empty decorative alt text.
  4. Use a rendered performance test for any item this report marks not evaluated.
 
 
 
       
     
     
What the results mean
A finding reflects only markup visible in the response. Missing attributes and clearly unsupported patterns require attention; observations such as empty alt text need human context. A pass confirms one implemented rule, while not evaluated explicitly means the tool did not request or render enough evidence.
 
How it works
The checker fetches the public page and parses its raw HTML into a document context. Image-category detectors inspect supported img attributes and ImageObject markup, then return structured severity, summary, and evidence fields. It does not request the image files themselves.
 
Features
  • Alt-attribute coverage and image-markup checks.
  • Loading hints, format clues, and supported ImageObject signals.
  • Evidence from the page source without uploading image assets.
  • Explicit not-evaluated output for render- and network-dependent checks.
 
Limitations
The tool cannot see CSS backgrounds, canvas content, JavaScript-injected images, visual image meaning, file bytes, compression quality, rendered display size, or real performance timing. It cannot write alt text responsibly without seeing and understanding the image in context.
 
Frequently asked questions
Should every image have descriptive alt text?
Every img element should have an alt attribute, but decorative images should usually use an empty alt value. Informative images need concise text that conveys their purpose in context.
Can this tool identify the Largest Contentful Paint image?
No. Actual LCP requires a rendered performance measurement. This checker reports that check as not evaluated rather than guessing from source order or filename.
Does WebP automatically improve image SEO?
No. A modern format can reduce transfer size, but search visibility also depends on relevance, accessibility, discoverability, surrounding text, and correct page implementation.
Why are CSS background images missing?
The checker reads image signals in raw HTML. It does not fetch stylesheets or render CSS, so background images and JavaScript-inserted images are outside its evidence set.
 
Next stepContent Gap Analyzer — look up the exact spec and expected values.

People also explore
ToolHeading Structure CheckerToolAccessibility TesterToolLink AnalyzerArticleAlt TextArticleThe HTML lang AttributeArticleRanking in Google Images
 
 
 
Feature requests for Image Seo Checker
 

Upvote what you want most. New ideas can be submitted from the floating Feedback menu;
      requests appear here once approved, and the most-wanted rise to the top.

   
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Informazioni sullo strumento
Controlla immagini e attributi SEO di una pagina per individuare alt mancanti, dimensioni, formati, lazy loading e segnali di peso.
Funzionalità
  • Elenco di src, srcset, alt, dimensioni dichiarate e formato osservato.
  • Finding per alt vuoto o mancante, immagini sovradimensionate e loading incoerente.
  • Separazione tra immagini HTML e background non leggibili dal parser.
  • Report locale esportabile senza caricare il file HTML altrove.
Come funziona
Incolla HTML o inserisci una URL pubblica. Il tool raccoglie gli elementi img, normalizza gli attributi, calcola i finding deterministici e mostra le immagini che meritano revisione.
Limitazioni
  • La modalità URL legge HTML raw e non esegue JavaScript: immagini inserite dopo il caricamento possono mancare.
  • Dimensioni e formato dipendono dalla risposta accessibile; il checker non sostituisce una prova completa delle prestazioni reali.
Domande frequenti
Un alt vuoto è sempre un errore?
No. Un alt vuoto è appropriato per immagini decorative; il finding chiede di verificare che la scelta sia intenzionale.
Controlla le immagini di background CSS?
No. Analizza gli elementi e gli attributi presenti nell’HTML disponibile; i background richiedono un controllo separato.
Il report misura il Core Web Vitals?
No. Mostra segnali statici come dimensioni e formato; una misurazione reale richiede un ambiente browser e condizioni di rete.