Text diff

About this tool

A text diff tool compares an original and a changed version of some text and shows exactly what moved, was added, or was removed. Paste the two versions into the boxes, pick line, word, or character mode, and the tool renders the differences below: additions in green, removals in red, everything else unchanged. Line mode gives you a unified view with + and - prefixes, similar to git diff; word and character mode inline the changes so small edits are easy to spot inside a sentence.

Everything runs in your browser using the jsdiff library, which implements the classic Myers diff algorithm. Neither text ever leaves your machine or touches a server, so it works fine for a contract redline, a snippet of code with an API key still in it, or a draft you haven’t shared with anyone yet.

Reach for this when reviewing an edited paragraph, comparing two versions of a config file, checking what a rewrite changed in a legal clause, or spotting a one-character typo fix buried in a long line.