Smart Diff Checker - Compare Text & Code Files Instantly

A powerful, user-friendly online tool to compare text files and code. Instantly find differences with syntax highlighting, side-by-side view, and customizable themes. Perfect for developers, writers, and content creators.

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Why Use Our Diff Checker Tool?

Our diff checker provides the most comprehensive text and code comparison experience with advanced features designed to make your workflow more efficient.

🔍 Instant Comparison

Compare two texts or code files instantly with our powerful diff algorithm. See differences highlighted in real-time with color-coded changes.

🎨 Syntax Highlighting

Support for multiple programming languages including JavaScript, Python, HTML/XML, and CSS. Code is displayed with proper syntax highlighting for better readability.

🌓 Dark & Light Themes

Switch between dark and light themes to match your preference. Our tool automatically saves your theme choice for future visits.

📱 Responsive Design

Works seamlessly on desktop, tablet, and mobile devices. Compare files anywhere, anytime with our responsive interface.

How to Use the Diff Checker

  1. Paste or upload your original text/code in the left panel
  2. Paste or upload your modified text/code in the right panel
  3. Click "Find Difference" to compare the files
  4. Navigate through differences using the navigation buttons
  5. Use the transformation tools to modify text as needed

Key Features

  • Line-by-Line Comparison: See exactly which lines have been added, removed, or modified
  • Error Highlighting: Errors are highlighted with a dark background and red border for easy identification
  • Text Transformation: Convert text to lowercase, sort lines, or trim whitespace with one click
  • File Upload: Directly upload files from your device for comparison
  • Syntax Support: Multiple programming languages with proper syntax highlighting

Common Use Cases

  • Code Review: Compare different versions of code to identify changes
  • Document Comparison: Track changes in documents, contracts, or legal texts
  • Content Editing: See revisions made to articles, blog posts, or other content
  • Debugging: Identify what changed between working and broken code