Free Diff Checker
Compare two texts side by side and see every difference
Line-by-Line
Client-Side
File Upload
+0 added
-0 removed
0 unchanged
Frequently Asked Questions
A diff checker (short for "difference checker") is a tool that compares two pieces of text and highlights what has changed between them. It is used extensively in software development for code reviews, version control, and debugging. It shows which lines were added, removed, or modified.
Absolutely. All text comparison happens locally in your browser using JavaScript. No data is transmitted to any server. You can verify this by disconnecting from the internet — the tool will continue to work.
You can compare any plain text content including source code (JavaScript, Python, Java, C++, PHP, Ruby, Go), markup (HTML, XML, JSON, Markdown), configuration files, and plain text documents. Binary files are not supported.