Compared in Your Browser
Your HTML source is processed locally and is not sent to the Compare2Word document-processing API.
Compare HTML Files Online
Paste or open two versions of HTML source and quickly find the lines and text that changed.
Click to select or drag file
Supports .html, .htm, .txt
MAX 50MBRead and compared on this device.
Click to select or drag file
Supports .html, .htm, .txt
MAX 50MBRead and compared on this device.
Source-Level HTML Diff
Compare HTML and HTM source as text, including tags, attributes, comments, and visible copy.
Split or Unified Review
See added and removed lines in the layout that makes a code review easiest for you.
Review Changes Between Two HTML Sources
Check page edits and template revisions
Use the HTML diff checker to review changes to landing pages, email templates, components, or saved page source without reading both files from top to bottom.
See the exact source that changed
Tags, attributes, comments, whitespace, and text content are compared as source lines. Split and unified views help you inspect edits in the format you prefer.
Not a visual or DOM comparison
The tool does not render the pages, compare screenshots, build a DOM tree, or judge whether two implementations behave or look the same. Formatting changes in the source may appear even when the rendered page is unchanged.
Source example
A source diff and a visual comparison answer different questions
This tool compares HTML as text. It can show an exact tag, attribute, comment, or copy edit, but it does not render two pages or determine whether different markup produces the same visual result.
Sample files
Download the source pair and formatting-only case
The normal pair changes content and attributes. The compact third file renders similarly to the original but creates a noisy literal source diff.
Sample updated
Expected source changes in the public product-card pair.
| Change | Original source | Revised source |
|---|---|---|
| Page title | <title>Starter plan</title> | <title>Team plan</title> |
| Card attributes | class="plan-card" data-plan="starter" | class="plan-card featured" data-plan="team" |
| Link | /html-compare; no aria-label | /html-compare#main-content; descriptive aria-label |
| What the diff proves | The source strings changed | Not whether the rendered design is correct |
Choose the evidence the review needs
HTML source comparison is useful during code review. Visual, accessibility, and behavior checks require additional tools.
Format both sources consistently
Equivalent markup with different indentation can create noisy line changes. Run the same formatter on both versions when possible.
Inspect tags, attributes, and copy
Use the diff to find the exact source edit, including data attributes, ARIA labels, comments, and visible text.
Test the rendered page separately
Use a browser, screenshot comparison, accessibility audit, and functional tests when layout or behavior is part of the acceptance criteria.
A good fit for
- Landing-page, template, and email-source revisions
- Finding exact tag, attribute, comment, and copy changes
- Reviewing HTML snippets without running the page
Choose another method if
- You need screenshot or layout comparison
- JavaScript behavior or network activity must be tested
- You need semantic DOM matching that ignores formatting
HTML File Comparison FAQ
How do I compare two HTML files?
Paste the two HTML sources or choose HTML or HTM files, then start the comparison to highlight changed source lines.
Does the tool compare how two web pages look?
No. It compares HTML source as text and does not render pages or compare screenshots and visual layout.
Does it understand DOM or semantic changes?
No. The comparison is line-based text diffing, so it does not build a DOM tree or determine whether different markup has the same meaning.
Can whitespace and formatting changes appear in the result?
Yes. Because the source is compared as text, indentation, line breaks, and other formatting edits may be shown as differences.
Is my HTML uploaded for comparison?
The comparison runs in your browser and the source is not sent to the Compare2Word document-processing API.