Start free
← Free SEO tools

image alt text checker

Check every image
has something to say.

Paste a page or a post and see every image with its alt text, with the likely problems marked. Nothing is fetched or uploaded.

    These checks look at the text only and are guidance, not Google rules. The tool cannot see the images, so it cannot tell whether the alt text describes them. It reads pasted HTML only: images added by JavaScript, CSS backgrounds and inline SVG are not listed.

    More tools: Heading structure checker · Readability checker · SEO checklist · All free tools

    Free, no account, nothing leaves your browser.

    How to use it

    1. 1
      Paste your HTML

      Paste the whole page or just the part with the images: the source of a post, a template, or the output of your editor.

    2. 2
      Read the list

      Every img element is listed in order with its source and alt text. Flags mark a missing alt attribute, an empty alt to double-check, filename-like alt text, long alt text and alt text that starts with "image of" or "picture of".

    3. 3
      Fix and re-paste

      Describe what the image shows, in your own words, in the context of the page. Mark purely decorative images with an empty alt. Then paste again to check.

    Questions

    Why does alt text matter?

    Alt text is read aloud by screen readers, shown when an image fails to load, and used by search engines to understand what an image is about. Good alt text is mainly an accessibility practice. It is not a ranking trick.

    Is an empty alt wrong?

    No. An empty alt attribute (alt="") is the correct way to mark a purely decorative image so screen readers skip it. That is why the tool labels empty alt as "check it is decorative" and not as an error. A missing alt attribute is different: the reader may announce the file name instead.

    How long should alt text be?

    There is no official limit. A common guideline is to keep it under about 125 characters because some screen reader setups handle long alt text poorly. The tool flags longer alt text as guidance only, not a rule. Complex images such as charts can need a longer description in the page text.

    Why avoid "image of" and "picture of"?

    Screen readers already announce that the element is an image, so starting alt text with "image of" repeats it. It is a style guideline, not an error, and it is flagged only as a suggestion.

    Can the tool tell if my alt text is good?

    No. It checks the shape of the text only: whether it is missing, empty, looks like a file name, is long, or starts with a filler phrase. It cannot see the image, so it cannot judge whether the text describes it accurately. Only a person can.

    What does it not cover?

    Only img elements in the HTML you paste are read. Images added by JavaScript after the page loads, CSS background images, inline SVG and images inside other iframes are not seen. Lazy-load attributes such as data-src are shown as the source when src is missing. Input is limited to 500,000 characters and the first 300 images are listed.

    Is my HTML sent anywhere?

    No. Parsing happens in your browser. Pasted HTML is parsed as an inert document: scripts do not run, images are not loaded and everything is shown as plain text.

    More free SEO and GEO tools

    AI visibility checkerGEO

    Does ChatGPT search or Google AI Overviews cite your site? Who do they cite instead?

     AI crawler checkerGEO

    Is your robots.txt blocking ChatGPT, Claude, Perplexity or Gemini? 16 AI bots checked, plus llms.txt.

     Robots.txt and sitemap checkerSEO

    Can Google and Bing crawl your site? Is your sitemap valid and listed in robots.txt?

     Robots.txt generatorGEO

    Build a robots.txt with your sitemap and blocked paths, plus presets to block AI training bots and keep AI search.

     llms.txt generatorGEO

    Create an llms.txt in the llmstxt.org format. A proposal, not a ranking tactic, and the page says so.

     Schema markup generatorSEO

    JSON-LD for FAQPage, Article, LocalBusiness and Organization, with required-field hints. No fake review schema.

     Open Graph tag generatorSEO

    Write og: and Twitter card tags, preview the share card and catch long titles and non-https images.

     Blog post ideasContent

    Real searches your site could write a post for, with approximate monthly volume and a suggested post format.

     SERP snippet checkerSEO

    Preview your title and meta description in Google, with the pixel widths Google truncates at.

     Keyword combinerSEO

    Combine up to three keyword lists into every long-tail variation, ready to copy.

     Keyword density checkerContent

    Paste an article: see the words and phrases it repeats most, and spot keyword stuffing.

     Word counter and reading timeContent

    Live word, character, sentence and paragraph counts, reading time, and rough length guides for titles, meta descriptions and posts.

     Readability checkerContent

    Flesch reading ease, grade level, sentence length, long sentences and a passive-voice hint for English text. Syllables are estimated.

     UTM builderSEO

    Add source, medium and campaign to any link so analytics shows where each visit came from. Copy the tagged URL.

     Title case converterContent

    Switch any headline or paragraph to title case, sentence case, UPPERCASE or lowercase. Acronyms and brand names you typed are kept.

     hreflang generatorSEO

    List your language versions and copy the full set of hreflang link tags, with an optional x-default.

     Heading structure checkerContent

    Paste HTML or markdown and see the H1 to H6 outline, with missing or multiple H1s, skipped levels, empty and long headings flagged as guidance.

     Robots meta tag generatorSEO

    Build a robots meta tag and X-Robots-Tag header with noindex, nosnippet and max-snippet, plus Apache and nginx snippets. Directives documented by Google.

     Keyword grouperSEO

    Paste up to 2,000 keywords and group them by shared words into a first draft of topic clusters. Groups by words, not search intent. Copy or download CSV.

     Link and anchor text checkerContent

    Paste HTML and list every link with its anchor text and rel values. Flags generic and empty anchors, placeholder hrefs and mixed anchors as guidance.

     SEO content brief generatorContent

    Turn a keyword, intent and reference URLs into a brief template: title options, outline, questions, on-page checklist and E-E-A-T prompts. Copy or download markdown.

     301 redirect generatorSEO

    Paste old and new URLs and get redirect rules for Apache, nginx, Netlify and Cloudflare _redirects and Vercel. Validates input and flags duplicates, chains and loops.

     FAQ schema generatorSEO

    Paste your questions and answers and copy valid FAQPage JSON-LD, safely escaped. Valid markup only: Google no longer shows FAQ rich results.

     Sitemap generatorSEO

    Paste a list of URLs and download a valid sitemap.xml: duplicates removed, one site, XML-escaped, 50,000-URL warning.

     SEO checklist for blog postsContent

    An interactive pre-publish checklist: intent, on-page, technical and after-publish checks, saved in your browser, with a free tool linked where one helps.

     Content calendar generatorContent

    Turn a list of topics into a dated publishing schedule. Pick the start date, weekdays and pace; copy it or download a CSV.

     URL slug generatorSEO

    Turn any title into a short, clean, SEO-friendly URL slug, in any language.

     SEO content cost calculatorContent

    Cost per blog post and per month: freelancer, agency, in-house, AI tools or Balzac. Your numbers, editable.

    Let Balzac write the articles.

    Type your website. Balzac finds the searches you can win, writes articles built to rank on Google and get cited by ChatGPT, and publishes them for you.

    3 free articles · No card needed