This tool helps you find differences in HTML code. I use it every day to check changes in web pages. Sometimes I edit a website and forget what I updated. This tool shows me exactly what lines changed. I like that it works without uploading files. Everything stays on my computer. That feels safe.

Why Compare HTML?

HTML is the skeleton of websites. Missing a closing tag can break a page. Last week I wrote a <div> but forgot the </div>. My layout looked messy. This tool found the error in seconds. It highlighted the line in red. Now I check every time. I think it saves hours of debugging.

Do you work with templates? I do. Clients send me new versions of HTML files. I need to spot changes quickly. This tool compares old and new versions side by side. Green lines show added code. Red lines show deleted code. I once found a hidden tracking script this way. It was in the new file but not the old. Always check your code.

How It Works

Paste your HTML into two boxes. Click "Compare". The tool checks tags attributes and content. It ignores extra spaces. That helps if someone formats code differently. I compared Bootstrap templates once. The tool showed me class changes I missed. Now I use it before every site launch.

What if your HTML is messy? The tool still works. It compares line by line. I tested it with minified code (no spaces). It highlighted missing script sources. A friend told me it found a broken image link in his portfolio. He fixed it before the job interview. Small things matter.

Real Examples

Case 1: A blog header disappeared. The old HTML had <header class="main">. The new version had <header class="mian">. The tool showed the typo. Case 2: A form stopped working. The compare revealed a missing <form> tag. Simple fixes. Big impact.

I once edited a navigation menu. The mobile version stopped working. The tool showed me I deleted a <button> for the mobile menu by accident. I felt stupid but grateful. Have you ever made that mistake? This tool is like a second pair of eyes.

Try comparing these two snippets:

<!-- Version A -->
<img src="cat.jpg" alt="A black cat">

<!-- Version B -->
<img src="cat.jpeg" alt="A black cat">
    

The tool highlights .jpg vs .jpeg. Tiny difference. Huge problem if the file doesn’t exist.

For Teams

My team shares HTML drafts. Sometimes we edit the same file. This tool shows who changed what. We avoid conflicts. No more "Did you remove this script?" emails. We paste both versions and see. It’s faster than meetings. What do your teammates do?

Pro tip: Use it with CSS/JS files too. I found unused styles this way. Deleted 200 lines of code. Made the site faster. Boss was happy. Coffee was free that day.

Limitations?

It won’t fix your code. You need to make changes manually. It doesn’t validate HTML. Use W3C Validator for that. But for spotting differences it’s perfect. I wish it had a dark mode toggle. Wait it does! Just click the moon icon. Cool right?

Final thought: I trust this tool more than my memory. Human eyes get tired. Code doesn’t lie. Green and red lines tell the truth. Try it next time you edit HTML. You might surprise yourself.