Compare HTML
Two pages can look identical in a browser and still be different files, which is exactly when an HTML comparison earns its place: the change may be a class name, a dropped attribute or one extra wrapper element. Comparing the markup surfaces those edits where a visual check cannot reach them.
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Does it compare the rendered page?
It compares the source. Two different markups can look the same and two similar ones can look different, so read the diff as a statement about the file rather than about its appearance.
Can I compare the text and ignore the tags?
Turning on the tag option hides markup edits so content changes stand out — useful when your question is whether the wording changed rather than whether the structure moved.
Will my original file be changed?
The result is downloaded as a separate file. Keep your original until you have checked the Markup, tag and attribute diff.
What should I check before using the result?
Open the Markup, tag and attribute diff in the application that consumes it and spot-check the parts that matter to you; the original file stays untouched if you need to re-run with different options.
Is Compare HTML free?
Yes. This tool is free with no trial limit, subscription, or watermark. Use it for personal and commercial projects without an account.
Are my files uploaded to your servers?
Comparison runs locally in your browser for supported formats. Your files and text stay on your device and are not stored on FileCompare servers.
What Is Compare HTML?
HTML diff compares markup, tags, and attributes between template versions—useful before deploy when CMS exports reorder attributes or inject whitespace.
When you need to spot changes quickly, a side-by-side diff beats manual scrolling. Paste content into both panels or upload HTML, HTM, and exported web page source, then review highlighted additions, deletions, and edits in one view.
Also known as a HTML diff tool, compare HTML online, web page code diff, this page is built for developers, writers, analysts, and QA teams who need accurate diffs without installing desktop software. Processing runs locally in your browser whenever the format allows, which keeps sensitive data off third-party servers.
How to Use Compare HTML Online
- Open the tool — No registration is required.
- Add the original — Paste or upload the first version in the left panel. Supported inputs include HTML, HTM, and exported web page source.
- Add the modified version — Paste or upload the second version in the right panel.
- Choose options — Use the case, whitespace, formatting, key-order, or format-specific settings shown on this page when available.
- Review the diff — Inspect highlighted changes in the results area.
- Copy or export — Save the comparison output for tickets, pull requests, or audit logs.
Tip: If this page offers sample data, load it first to see how the comparison behaves before working with your own files.
Key Features of Compare HTML
- Side-by-side diff — Clear view of HTML markup, tag, and attribute changes with color-coded additions and deletions.
- Multiple input methods — Paste text, upload files, and swap panels where supported.
- Format-aware — Handles HTML, HTM, and exported web page source with sensible defaults.
- Privacy-first — Browser-side processing; no server upload for supported formats.
- Free and unlimited — No account, watermark, or export cap for normal use.
- Cross-platform — Works on Chrome, Firefox, Safari, and Edge on desktop and mobile.
- No installation — Web-based diff checker; open the page and compare immediately.
Zero Data Retention — Compare Securely in Your Browser
FileCompare.org runs supported comparisons in your browser: your files and pasted text stay on your device. Nothing is uploaded, stored, or logged on our servers for browser-side formats.
That matters when you diff contracts, API keys, customer data, or unreleased code. You get instant side-by-side results without sending content over the network.
Common Use Cases
Teams choose an online diff when they need HTML markup, tag, and attribute changes without a heavy IDE or desktop suite. Typical scenarios include:
- Frontend template changes before deploy
- Email HTML regression checks
- CMS export comparison
- Accessibility markup audits
Because the tool is web-based, remote collaborators can share the same workflow from any location—useful for agencies, open-source maintainers, and distributed QA teams.
Tips for Best Results
Compare normalized HTML when CMS exports add different attribute ordering between saves.
When a portal or pipeline rejects your file, compare its encoding, line endings, and size limits with your source, adjust settings, and run the diff again.
Bookmark this page for repeat jobs—controls stay visible between uploads, which speeds up daily review cycles.
Related Workflows
If you are checking HTML validation before deploy, template comparison, frontend code review, this compare HTML page keeps the comparison focused on the relevant format and workflow. Use the related tools in the navigation when the input changes from text to structured data, lists, documents, or images.