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Text Diff Checker
Two versions of a contract, a translation or a config file rarely differ where you expect. This tool aligns them line by line and marks additions with a plus and removals with a minus, so the real change is obvious.
How to use it
- Paste the original on the left and the new version on the right.
- Press compare.
- Read the marked lines and the counts of what changed.
Examples
- Two drafts of a clause: only the sentence that actually moved is highlighted.
- Config files before and after an update, to see which keys were introduced.
- Checking that a copy-paste really is identical — no marks means no differences.
Questions people ask
Does it compare word by word?
No, it works at line level, which is how version control tools present changes as well. For a word-level check on a single sentence, split it across several short lines first and the alignment becomes very precise.
Is the comparison done on my device?
Yes. Both texts stay in the browser and neither one is sent anywhere, which makes this safe for contracts, medical notes and unreleased material.
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Updated: 2026-08-07