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Diff Checker

Paste original and changed text to see exactly what was added, removed, or kept — highlighted line by line with live counts.

Differences +0 -0 =0

Differences appear here instantly as you type...

How to use

  1. Paste original text on the left, changed text on the right.
  2. Differences highlight instantly as you type.
  3. Toggle ignore-case or ignore-whitespace for noisy diffs.

Frequently asked questions

How is this different from List Comparer?

List Comparer finds set overlap; Diff Checker shows ordered line-by-line changes with context, like git diff.

Does it work for code?

Yes — paste two versions of code, config, or articles; whitespace-insensitive mode helps with reformatted files.

Is there a size limit?

Lists up to 1000 lines use precise LCS diff; larger inputs fall back to fast multiset comparison.