Compare two texts and see exactly what was added and removed, line by line.
A line-by-line diff that highlights added and removed lines between two versions of any text, using a longest-common-subsequence match like the tools developers use. Ideal for reviewing edits to documents, contracts, code and config. It runs entirely in your browser, so nothing is uploaded.
A "diff" shows what changed between two versions of text: which lines or words were added, removed or altered. It is the backbone of code review and version control, but it is just as useful for spotting edits between two drafts, contracts or config files. The tool above highlights the differences so you can see at a glance what moved, rather than re-reading both versions line by line.
How to read one. Most diffs mark additions and deletions in contrasting colours, with unchanged text shown for context. A modified line often appears as a deletion of the old and an addition of the new, side by side or stacked. Focusing only on the highlighted parts lets you review a large change quickly and catch an unintended edit you did not mean to make.
Where it saves you. Comparing what a colleague changed before you accept it, checking that a copied-and-tweaked file matches the original except where intended, or confirming that a "find and replace" only touched what it should. Any time two things are meant to be almost identical, a diff is far more reliable than eyeballing them.