Diff Checker — How to Compare Two Texts Side by Side

Spot every difference between two versions of any text — code, documents, contracts, or data. Color-coded comparisons make it easy.

You have two versions of a document and you need to find what changed. Maybe it's two drafts of a contract and you need to verify the legal team's edits. Maybe it's two versions of a config file and your deployment broke. Maybe you're reviewing a colleague's code changes.

Why visual diff matters

Reading through two documents side by side and manually comparing each line is tedious and error-prone. A diff tool does this automatically — highlighting additions in green, deletions in red, and modifications in yellow. You see every change at a glance.

Common use cases

Code review. Compare two versions of source code to see exactly what was modified. Especially useful when Git isn't available or when comparing code snippets.

Contract review. Verify that the only changes in a revised contract are the ones you agreed to. Legal documents should never be taken on faith.

Configuration files. Debug deployments by comparing the working config with the broken one. The difference is usually one line.

Content editing. See what an editor changed in your article, blog post, or documentation.

Compare now

Toolozo's Diff Checker lets you paste two texts side-by-side and instantly highlights every difference. Additions, deletions, and modifications are color-coded. No login, no file upload — everything stays in your browser. This matters especially for legal docs or proprietary code.