SIGNAL / 29

Inspect saved webpage signals locally

Private website signal checker

Drop in saved HTML to inspect metadata, structure, resource references and text extractable from its markup—or use the private page checker for computed-visible text. Nothing is fetched or uploaded.

Check saved HTML Use private page checker

What the local check returns

AI signals you can inspect—not a verdict you have to trust

The report explains what was measured and keeps three questions separate.

Writing patternsRepetition, sentence rhythm, vocabulary and punctuation

Page evidenceDeclared metadata, page structure and resource references

Reader qualityLong sentences, repeated phrasing and hidden Unicode

No AI probability score. This release describes signals but does not claim who wrote the text.

Plain-language summary

Start here

Writing patterns AI-signal lens

Page evidence Provenance lens

Reader quality Editorial lens

Technical measurement receipt

Exact counts, coverage and formatting checks

What was measured

extractor v1.2.0

Formatting comparison

Variant	Words	Sentences	Paragraphs	Characters	Text changed	Scalar count Δ	Writing measurements changed

Optional model

Named local detector is not in this release

The deterministic report above works now. A model button will appear only after the exact weights, hosting, formatting tests and held-out model card pass release review. No placeholder probability is shown.

Not enabled in this release

Analyze the page you are viewing

Use the private page checker

Copy the checker below.
Save it as a browser bookmark, then click it on a public page you can view.
Paste the copied snapshot into the field above.

It excludes form controls and hidden content, refuses account and payment paths, and copies a bounded summary to your clipboard. It opens no network connection to AI Text Signals.

Bookmarklet code

javascript:(()=>{try{
  const denied=/(?:login|log-in|signin|sign-in|account|admin|auth|billing|bank|checkout|dashboard|inbox|messages|orders|payment|private|profile|settings|subscription|wallet)/i;
  const sensitiveForm=document.querySelector('input[type="password"],input[autocomplete="current-password"],input[autocomplete="one-time-code"],input[autocomplete^="cc-"]');
  const privatePageHint=document.querySelector('meta[name="robots" i][content*="noindex" i]');
  if(denied.test(location.href)||sensitiveForm||privatePageHint){
    alert("AI Text Signals: snapshot disabled on account, dashboard or payment pages.");
    return;
  }
  const blockedTags=new Set(["SCRIPT","STYLE","NOSCRIPT","TEMPLATE","INPUT","TEXTAREA","SELECT","OPTION","BUTTON"]);
  const styleTags=new Set(["P","H1","H2","H3","H4","LI","BLOCKQUOTE"]);
  const blockTags=new Set(["ADDRESS","ARTICLE","ASIDE","BLOCKQUOTE","BR","DD","DIV","DL","DT","FIELDSET","FIGCAPTION","FIGURE","FOOTER","FORM","H1","H2","H3","H4","H5","H6","HEADER","HR","LI","MAIN","NAV","OL","P","PRE","SECTION","TABLE","TBODY","TD","TFOOT","TH","THEAD","TR","UL"]);
  const hiddenElement=(node)=>{
    if(!(node instanceof Element))return false;
    if(blockedTags.has(node.tagName)||node.hasAttribute("hidden")||node.getAttribute("aria-hidden")==="true")return true;
    try{
      const style=getComputedStyle(node);
      return style.display==="none"||style.visibility==="hidden"||style.visibility==="collapse"||style.opacity==="0"||style.contentVisibility==="hidden";
    }catch(error){return true;}
  };
  const parts=[];
  const styleNodes=[];
  const pending=[{node:document.body,phase:"enter"}];
  const nodeLimit=50000;
  const textLimit=100000;
  let visited=0;
  let capturedScalars=0;
  let textLimitReached=false;
  let pendingSpace=false;
  const retain=(character)=>{
    if(capturedScalars>=textLimit){textLimitReached=true;return false;}
    parts.push(character);
    capturedScalars+=1;
    return true;
  };
  const boundary=()=>{if(capturedScalars>0)pendingSpace=true;};
  const appendText=(input)=>{
    for(const character of input){
      if(/\s/u.test(character)){if(capturedScalars>0)pendingSpace=true;continue;}
      if(pendingSpace){if(!retain(" "))break;pendingSpace=false;}
      if(!retain(character))break;
    }
  };
  while(pending.length&&visited<nodeLimit){
    const {node,phase}=pending.pop();
    if(phase==="exit"){if(blockTags.has(node.tagName))boundary();continue;}
    visited+=1;
    if(node.nodeType===Node.TEXT_NODE){
      if(node.nodeValue&&node.nodeValue.trim())appendText(node.nodeValue);
      continue;
    }
    if(!(node instanceof Element)||hiddenElement(node))continue;
    if(blockTags.has(node.tagName))boundary();
    if(styleTags.has(node.tagName)&&styleNodes.length<250)styleNodes.push(node);
    pending.push({node,phase:"exit"});
    for(let index=node.childNodes.length-1;index>=0;index-=1)pending.push({node:node.childNodes[index],phase:"enter"});
  }
  const safeMeta=new Set(["generator","application-name","author"]);
  const meta={};
  document.querySelectorAll("meta[name],meta[property]").forEach(node=>{
    const key=(node.name||node.getAttribute("property")||"").toLowerCase().slice(0,100);
    const value=(node.content||"").slice(0,500);
    if(safeMeta.has(key)&&value)meta[key]=value;
  });
  const styles={fonts:{},colors:{},backgrounds:{}};
  styleNodes.forEach(node=>{
    const style=getComputedStyle(node);
    [[styles.fonts,style.fontFamily],[styles.colors,style.color],[styles.backgrounds,style.backgroundColor]].forEach(([bucket,value])=>{
      if(value)bucket[value]=(bucket[value]||0)+1;
    });
  });
  const visibleText=parts.join("");
  const nodeLimitReached=pending.some(item=>item.phase==="enter");
  const value={
    schemaVersion:"aitextsignals.snapshot.v1",
    source:{origin:location.origin,pathname:location.pathname},
    title:document.title.slice(0,300),
    visibleText,
    meta,
    computedStyleSummary:styles,
    coverage:{visitedNodes:visited,nodeLimit,nodeLimitReached,capturedScalars:[...visibleText].length,textLimit,textLimitReached,complete:!nodeLimitReached&&!textLimitReached}
  };
  navigator.clipboard.writeText(JSON.stringify(value)).then(
    ()=>alert("AI Text Signals snapshot copied. Paste it into the website signals tool."),
    ()=>alert("Copy was blocked. Allow clipboard access and try again.")
  );
}catch(error){alert("AI Text Signals could not create a snapshot on this page.");}})()

Why there is no URL box

Browsers cannot reliably read arbitrary third-party URLs without a server-side crawler. Adding one would upload page material and break this product's local-only privacy boundary, so the site uses saved files and an explicit local snapshot instead.

Page evidence has levels

Signed or directVerifiable credentials or explicit source declarations.
DeclaredGenerator, author or application metadata present in the supplied bytes.
Specific fingerprintA named, versioned signature with a narrow interpretation.
Generic contextFrameworks, styles and patterns that many pages share.
Not observedAbsence is not evidence of human authorship.

Read before using a result

What this cannot tell you

A pattern match does not prove who wrote, edited or approved the text.
Page builders, fonts and metadata describe a page, not the authorship of its words.
Do not use this report as the sole basis for an academic, employment, moderation, publication or legal decision.
Short, mixed-language, translated and heavily formatted text may produce findings without an eligible benchmark result.