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Code Diff Checker
Find differences between two code snippets or text documents with syntax-highlighted diff view. Supports both inline and side-by-side modes. Great for code reviews, comparing config files, or text comparison.
Original
Modified
+4 added-4 removed
Unified Diff
+
function greet(name, greeting = "Hello") {+
console.log(greeting + ", " + name + "!");
+
return { name, greeting };+
}
-
function greet(name) {-
console.log("Hello, " + name);-
return name;
-
}
Diff Algorithms
Myers diff algorithm: finds minimum edit distance Edit operations: + Addition (green) - Deletion (red) No change (white) Unified diff format: @@ -start,count +start,count @@
Examples
Compare two functions
Result: 1 changed line (function signature), 1 changed line (return)
Added parameter c visible in red/green diff highlighting.
Frequently Asked Questions
Is my code safe?
Yes. Diff comparison happens entirely in your browser. No code is sent to any server.
Can I compare non-code text?
Yes. The diff tool works on any text — code, markdown, config files, JSON, SQL, or plain prose.