Can I compare full HTML pages?

Yes. Paste the full HTML source of both pages and the tool diffs the entire content, including DOCTYPE, head, and body.

Why does formatting HTML first help?

Inconsistent indentation causes many false diff lines where only whitespace changed. Formatting both files to consistent indentation first means the diff shows only real content and structural changes.

Can I compare HTML snippets or components?

Yes. You can compare any HTML content — full pages, components, templates, or even single elements.

Will it detect changed attribute values?

Yes. Attribute and value changes within a tag appear as modified lines in the diff output.

Is the tool useful for template version control?

Yes, particularly when you need to review changes between template versions without a Git repository or when sharing a comparison with non-technical colleagues.

Browse tools

Free · Fast · Privacy-first

Compare HTML Files Online

Track changes in HTML templates, components, or pages by comparing two versions side by side. FixTools Diff Checker shows every changed tag, attribute, and text node — making it easy to review HTML edits or catch unexpected modifications.

⚡ Use Tool Now How it works

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

⚡

Highlights tag, attribute, and content changes

🔒

Works with full pages and HTML snippets

✨

Format HTML first for cleaner diffs

Developer Tool

Diff Checker

All processing happens in your browser — your files are never uploaded to any server.

🚀Open Diff Checker

100% Free · No account · Works on any device

How to use this tool

💡

Paste two versions of your HTML into the comparison panels. For cleaner results, format both with the FixTools HTML Formatter before diffing to remove whitespace noise.

How It Works

Step-by-step guide to compare html files online:

1
Format your HTML files
Optional but recommended: paste each HTML file into the FixTools HTML Formatter to normalise whitespace and indentation.
2
Open Diff Checker
Navigate to the Diff Checker tool.
3
Paste original HTML
Paste the original HTML into the left panel.
4
Paste updated HTML
Paste the new version into the right panel.
5
Compare
Click Compare to see all changed lines highlighted.