HTML Compare

HTML Compare

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What is HTML Compare

HTML Compare is a free online diff tool for two HTML texts. It highlights additions and removals with line and word-token detail, supports side-by-side or unified views, and can download a .diff file.

It compares the text you provide — not a separate semantic DOM tree diff. Useful before publishing CMS or email HTML changes.

How to use HTML Compare

  1. Step 1: Load Original and Changed. Paste or Import each side, or Load sample.
  2. Step 2: Tune the diff view. Toggle Side by side, Word wrap, Live highlight, Sync scroll, and Trim lines as needed.
  3. Step 3: Navigate changes. Jump previous/next change, Swap sides, or Reset.
  4. Step 4: Download a .diff. Save a file copy for review threads when you want an artifact outside the browser.

HTML Compare Features

  • Line and word-token HTML text diff
  • Side by side, Word wrap, Live highlight, Sync scroll, Trim lines
  • Previous / next change navigation
  • Swap sides, Reset, Import Original/Changed, Load sample
  • Download .diff

Common use cases

  • Review email HTML revisions: Diff two template versions before a campaign launch.
  • Confirm cleanup scope: With Trim lines, check whether a format/minify pass only changed whitespace.
  • Attach a .diff to a ticket: Download the comparison for async review.

Examples / supported formats

Compares two HTML texts:

  • Original and Changed HTML panes
  • Import for each side
  • Download: .diff

Edit and preview a single version in HTML Viewer. Format before comparing with HTML Formatter.

FAQ

Is HTML Compare free?
Yes. Tools Viewer tools are free to use in the browser with no account required.
Do I need to create an account to use HTML Compare?
No. Open the tool and start working — signup is not required.
Is my content uploaded to your servers?
No. HTML Compare runs in your browser. Content stays on your device unless you copy or download a file yourself.
Does it do a semantic DOM diff?
No. It diffs the HTML text you provide (line and word tokens), not a separate DOM-tree comparison. For live preview while editing, use HTML Viewer.
How do I compare two HTML files online?
Paste or Import Original and Changed HTML into HTML Compare, review highlights, then Download a .diff if you need a file.