Code Diff Tool
Compare two files, highlight differences, and merge changes in real-time.
1 Original File
2 Modified File
Difference Viewer
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Deletions
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Online Code Difference & Comparison Tool
Comparing code manually is error-prone and time-consuming. Our Online Diff Tool provides a professional interface to instantly spot differences between two blocks of text or source code. Built with performance and privacy in mind, it handles large files directly in your browser.
Real-time Comparison
As you type or edit, the tool automatically updates the diff view, highlighting every single character change instantly.
100% Client-Side
Your data never leaves your computer. All comparison logic happens locally, ensuring your sensitive code stays private.
Interactive Merging
Not just a viewer, but a powerful editor. Easily move changes from one side to another with intuitive merge controls.
Syntax Aware
Supports syntax highlighting for dozens of languages including JS, Python, PHP, Java, and more for better readability.
How to compare files?
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Upload First File: Drag and drop your original file into the left panel or click to select.
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Upload Second File: Drag and drop your modified file into the right panel.
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Analyze Differences: Review the highlighted changes. Use the center gutter to navigate between diffs.
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Merge or Edit: Click the arrows to merge changes or edit the code directly in the panels.