Diff Checker

Side-by-side text comparison. Highlights additions, deletions, and unchanged lines.

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Paste two versions of text below — the original (before) on the left and the changed (after) on the right. The diff appears underneath.

Original · before
Changed · after
Diff

Paste text on both sides to compare.

Compare two pieces of text and see exactly what changed — line by line, word by word, or character by character — with clear additions and removals. Ignore case or whitespace and get a quick count of the changes.

How to use Diff Checker

  1. 1Paste the original text on the left and the changed text on the right.
  2. 2Choose Lines, Words, or Characters granularity.
  3. 3Optionally ignore case or whitespace.
  4. 4Read the highlighted diff with added/removed counts.

Frequently asked questions

No. The comparison runs entirely in your browser, so code, documents, and any private text you diff stay on your device.
Yes. Switch to Words or Characters for GitHub-style inline highlighting that pinpoints exactly what changed within a line.
Yes — toggle “Ignore case” and “Ignore whitespace” to focus on meaningful changes only.
Yes — free and unlimited, with no sign-up required.

Still have questions?

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