DiffChecker — LaTeX document diff tool

Compare two versions of a LaTeX document side-by-side and see exactly what changed.

What DiffChecker does

Paste the original text on the left, the modified text on the right, and click Compare.

  • Side-by-side line-by-line summary: removed, modified, and added lines.
  • Word-level highlighting — only the actually changed spans are marked in modified lines, not the whole line.
  • Export the modified version as .txt or copy it with Copy modified.
  • Free, no sign-up needed.
Open DiffChecker →

Why this matters

“What actually changed between v3 and v4?” is hard to answer when a reformat reflows every line. DiffChecker compares two versions of a LaTeX document side-by-side, highlights the exact changed words, and separates real content edits from pure whitespace reflow — so a paragraph that only rewrapped doesn't drown out the one sentence you actually rewrote.

Examples

Word-level change

Old: The model achieves 91% accuracy on the test set. New: The model achieves 93.5% accuracy on the held-out test set. → DiffChecker reports one modified line and highlights exactly 91 → 93.5 and the added held-out.

FAQ

Does reflowed text show up as changes?

No — pure paragraph reflow is detected and reported separately so it doesn't masquerade as real edits.

Is my document stored?

No document text is stored after processing.

Does it need a Git history or special format?

No — paste or load the two versions directly; no version-control setup needed.

Can it merge the two versions?

No — DiffChecker shows what changed; it does not produce a merged file.

Related

Use it after PreSubmit to confirm a revision addressed the flagged issues without introducing new ones, or after Glossary to review the acronym rewrite.

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