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Code Diff Checker

Professional code diff checker that compares two code snippets and highlights differences line-by-line. Uses advanced diff algorithms to show additions, deletions, and modifications with color-coded visualization. Perfect for code reviews, merge conflict resolution, version comparison, and tracking changes. Features side-by-side comparison view, unified diff mode, syntax highlighting for multiple programming languages (JavaScript, Python, Java, C++, PHP, etc.), and line numbering for easy reference. The tool provides inline diff markers, whitespace comparison options, character-level diff highlighting, and statistics on changes (lines added, removed, modified). Essential for reviewing pull requests, comparing file versions, understanding code changes, resolving merge conflicts, debugging code modifications, and collaborating on code. Supports all text-based files including code, configuration files, JSON, XML, markdown, and plain text. Export diff results as unified diff format or HTML report for sharing.

100% Secure
Lightning Fast
100% Free
Client-Side Processing

💡 How to Use

  • 1.Paste your original code in the left textarea or upload a file
  • 2.Paste your modified code in the right textarea or upload a file
  • 3.Click "Compare" to see the differences
  • 4.Switch between Unified and Side-by-Side view modes
  • 5.Use "Copy Diff" to copy the unified diff format to clipboard

How to Use Code Diff Checker

1

Paste Code

Enter original code in left pane

2

Paste Modified

Enter modified code in right pane

3

Compare

See highlighted differences

4

Export/Share

Download diff report

Features

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Before/After Compare

View side-by-side comparison

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Privacy First

All processing happens in your browser

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Instant Download

Download processed images immediately

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Mobile Friendly

Works on all devices

Frequently Asked Questions

Q:How are differences highlighted?

A:Additions are shown in green, deletions in red, and modified lines in yellow with character-level highlighting.

Q:Can I ignore whitespace?

A:Yes, you can toggle options to ignore whitespace, trailing spaces, or line ending differences.

Q:What languages are supported?

A:Syntax highlighting supports JavaScript, Python, Java, C++, PHP, Ruby, Go, and many more programming languages.

Q:Can I export the diff?

A:Yes, export as unified diff format (patch file) or HTML report with highlighting preserved.

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Why Choose Our Code Diff Checker?

Our tool is completely free, requires no registration, and processes everything in your browser for maximum privacy and speed. No file size limits, no watermarks, just pure functionality.

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