HTML Tools

HTML Checker

HTML Checker — check HTML and flag issues like images missing alt text. It works entirely in your browser, with nothing uploaded to any server.

Client-sideRuns entirely in your browser — your data never leaves your device.

HTML Checker is a free HTML Tools utility that runs entirely in your browser — nothing you enter is uploaded.

HTML input
Parse tree & checks



  
How to use HTML Checker

  
    
      
  1. Type or paste your HTML into HTML Checker's input area.
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  2. Watch the output update instantly while you adjust the HTML.
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  3. Finish by choosing Copy to take the output with you.
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About this tool

  
HTML Checker runs entirely in your browser. HTML Checker works on HTML in your browser, transforming or previewing the markup you paste locally.

  
Your markup is never uploaded. Your input never leaves the page, and no account or install is required.

  
Frequently asked questions

  

      
How do I use HTML Checker?
Use HTML Checker to check your input without installing anything; everything happens client-side.

      
Does HTML Checker cost anything?
No — HTML Checker is completely free, with no sign-up and no hidden limits.

      
Does HTML Checker upload my data?
No — HTML Checker processes everything locally in your browser, so nothing you enter is uploaded or stored.

      
Will HTML Checker change my HTML structure?
HTML Checker only reformats or analyzes what you paste; the underlying structure of your HTML is preserved.

      
Can I use HTML Checker without a connection?
Yes — after the first load HTML Checker runs entirely offline.

  

  
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