Code Diff Highlighter
Create beautiful, syntax-highlighted code diffs for your blog posts and documentation. Compare two versions of your code and generate embeddable HTML/CSS, markdown or screenshot with dark or light theme.
Old Code
New Code
Customization Options
Is the Code Diff Highlighter free to use?
Yes, the Code Diff Highlighter is 100% free—no sign-up, no hidden fees, and no usage limits. We built this tool for developers, writers, and educators who want to create visually engaging code comparisons without barriers. Enjoy unlimited access, whether you're preparing a technical blog, a classroom handout, or a project showcase.
What programming languages does the code diff tool support?
Our tool is designed to recognize and highlight differences in virtually any programming language you throw at it. From mainstream languages like JavaScript, Python, and Java, to niche or emerging ones, the syntax highlighter adapts automatically. If you ever find a language it doesn't handle well, let us know—we're always improving!
How can I export and embed code differences?
Sharing your code diffs is a breeze. Instantly export your highlighted comparison as HTML/CSS, markdown, or even a screenshot. Whether you're updating documentation, writing a tutorial, or posting on forums like Stack Overflow, you can copy and paste the output directly—no extra formatting needed.
Does the code diff highlighter support dark and light themes?
Absolutely! You can toggle between an easy-to-read dark mode and a modern light mode with a single click. Both themes are carefully designed for readability and a professional appearance, so your code diffs will look great whether you're presenting on a projector or publishing on a blog.
How do I use the Code Diff Highlighter tool?
It's as simple as copy, paste, and compare. Drop your original code in the first box, your updated code in the second, and watch as the tool instantly highlights every addition, deletion, and change. You can then customize the theme and export the result in your preferred format.
Is my code secure and private when using the diff highlighter?
Your privacy is our priority. All code processing happens right in your browser—nothing is sent to any server, and nothing is stored. This means you can safely compare sensitive or proprietary code without worrying about leaks or data retention.
Can I use this tool for Git diffs and version control?
Definitely! The Code Diff Highlighter is perfect for visualizing changes from Git, GitHub, GitLab, or any version control system. Just paste in your diff output or code snippets from pull requests, and you'll get a clear, color-coded view of what's changed—ideal for code reviews, team discussions, or documentation.