About Us

TextDiffHub · The Proof Desk

TextDiffHub is a free online text diff checker. It exists because "what changed?" is one of the most frequent questions in software — between two versions of a source file, two releases of a config, two drafts of a release note — and the answer deserves more than a pair of scrolled windows and tired eyes.

What the Tool Does

Paste the original text on one side and the changed text on the other. The desk proofs them and hands back an exact edit script. Three ideas shaped every design decision:

  • The algorithm is the product. The engine implements the Myers diff algorithm — the same O(ND) shortest-edit-script search behind Git — so you never get a spurious change where a minimal one exists. Similar texts diff fast precisely because they are similar.
  • Granularity is a choice. Code wants line diffs with preserved indentation; Chinese copy wants word diffs where each CJK character is its own token; English proofreading wants character diffs that catch licence vs license. One engine, three token streams.
  • Context is reading. Every change carries ±3 lines of surrounding context, and untouched regions collapse into @@ bands you can expand — a 2,000-line config stays as readable as a 20-line one.

Our Approach

A comparison tool sees your most sensitive material — source code, configs with credentials, unpublished copy. That is why everything runs in your browser:

  • No uploads. Both texts are normalized, diffed and rendered locally with JavaScript. Nothing is transmitted to any server.
  • No sign-up. No accounts, no email walls, no watermarks.
  • No stored history. Close the tab and everything is gone.

The Name

"TextDiffHub" says what it is: a hub for text diffs. The site is styled like a proof desk because that is the honest metaphor — a diff is a proof pass. Deletions are struck in proofreader's red, insertions entered in annotator's green, and folded context bands are the ellipsis marks an editor leaves where nothing moved. When the desk is clean, the two versions agree.

Get in Touch

Found a pair of texts that diff incorrectly, or have an idea that would speed up your review workflow? We would love to hear from you — visit our contact page and drop us a line.