Diff Checker
Compare two texts side by side with line numbers and character-level diff highlighting. Paste any code, config, or document.
Side-by-Side ViewLine NumbersCharacter-Level DiffRuns in Browser
Common Use Cases
Code review
Compare an old version of a function against a refactored one to see exactly what changed — line by line and character by character.
Config file auditing
Diff two versions of a JSON, YAML, or TOML config to catch unexpected setting changes before deploying.
Contract & document comparison
Compare two versions of a legal document, README, or specification to see exactly which words, sentences, or sections changed.
API response debugging
Paste two API responses side by side to quickly find which fields differ between a working and broken request.