Code / Text Compare Tool
Easily compare two pieces of code or text side by side to highlight differences and merge changes instantly.
How To Compare Code
Paste Original Code
Copy the first version of your code or text and paste it into the "Original" text box on the left side.
Paste Changed Code
Copy the updated or modified version of your code and paste it into the "Changed" text box on the right.
See the Difference
Click the "Compare" button to instantly generate a side-by-side visual diff highlighting every change.
Key Features
Side-by-Side View
Provides a clear, side-by-side comparison layout that makes it effortless to spot additions, deletions, and edits.
Auto Merge Tool
Easily combine both blocks of code. Our tool seamlessly patches the original file with the modified changes.
Secure & Client-Side
Your code is processed entirely in your web browser. Absolutely nothing is transmitted to or stored on our servers.
Frequently Asked Questions
An online code compare (or "diff") tool takes two blocks of text or source code, analyzes them simultaneously, and visually highlights the exact differences, making it easy to identify what has been added, deleted, or modified.
Simply open your two files locally, copy the content from the first file into the "Original" text box, copy the content from the second file into the "Changed" text box, and click "Compare" to view them side-by-side.
In standard diff notation, lines highlighted in red signify content that was removed or deleted from the original version. Lines highlighted in green indicate new content that was added to the changed version.
Yes, 100%. This tool operates entirely on the client-side within your browser using JavaScript. Your pasted text or source code is never uploaded, transmitted, or saved to our remote servers.
Yes. Once you have pasted your original and updated code, you can click the "Merge" button. The tool will calculate the exact changes and generate a final, combined output block that you can copy to your clipboard.
Because it performs a strict line-by-line and character-by-character text comparison, our diff checker supports virtually every programming language, including HTML, CSS, JavaScript, PHP, Python, Java, and standard plain text.