The Diff Checker compares two pieces of text and highlights exactly what changed - removed lines in red with a − prefix, added lines in green with a + prefix, and unchanged lines dimmed for context. It runs a classic LCS (longest common subsequence) diff over lines, the same family of algorithm behind Git's diff, and shows you a count of additions and deletions at a glance. Character-level highlights pinpoint edits inside changed lines, Ignore-whitespace / Ignore-case toggles cut noise, and Unified/Split views switch the layout.

Everything happens in your browser: paste drafts, code snippets, configs or JSON and your text is never uploaded anywhere. You get 5 free comparisons with no account - IconVault Pro ($12/year) unlocks unlimited comparisons and every other tool on the platform.