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Convertto

Text Diff Checker

Compare two texts and highlight exactly what was added and removed.

To compare two texts, paste the original on the left and the changed version on the right. Additions are highlighted in green and removals in red, and you can compare by line, word or character depending on how fine-grained you need the diff.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why does my diff show a whole line changed for one character?

Because line-based diffing is the default — a line either matches or it does not. Word or character diffing shows the precise change, at the cost of being noisier on large edits.

How to use the text diff checker

  1. 1Enter or paste your original.
  2. 2Enter or paste your changed.
  3. 3Choose the compare by.
  4. 4The result appears immediately — copy or download it.

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Put the working text diff checker on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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