🚀 What is a Smart Text Compare?

🔒 100% Private & Secure - Your Data Never Leaves Your Device

Absolutely! Code Compare is built with privacy as the top priority. Unlike many online tools that upload your files to remote servers, our diff checker operates entirely within your web browser using client-side JavaScript.

How We Ensure Your Privacy:

• ✓ Zero Server Uploads: No text, code, or files are ever transmitted to any external server or cloud storage
• ✓ Client-Side Processing: All comparison algorithms run locally in your browser's JavaScript engine
• ✓ No Data Collection: We don't collect, store, or track any of your content or usage patterns
• ✓ No Cookies or Trackers: No third-party analytics or tracking scripts that monitor your activity
• ✓ Works Offline: After initial page load, you can disconnect from the internet and continue using the tool
• ✓ GDPR & Privacy Compliant: Perfect for handling confidential business documents, proprietary code, and sensitive information

Perfect for Sensitive Data: Whether you're comparing confidential contracts, proprietary source code, personal documents, or classified information, you can trust that your data remains completely private and secure on your device.

📝 Universal Text & Code Support

Code Compare is a versatile diff tool that works with any text-based content. Whether you're a developer comparing code, a writer tracking document changes, or a data analyst reviewing configurations, our tool handles it all seamlessly.

Supported Programming Languages & Formats:

• 💻 Web Development: HTML, CSS, JavaScript, TypeScript, JSX, TSX, SCSS, SASS, LESS
• 🐍 Backend Languages: Python, Java, C, C++, C#, Ruby, PHP, Go, Rust, Swift, Kotlin
• 📊 Data & Config Files: JSON, XML, YAML, TOML, CSV, INI, ENV files
• 📜 Scripting Languages: Bash, Shell, PowerShell, Perl, Lua, R
• 🗃️ Database & Query: SQL, PostgreSQL, MySQL, MongoDB queries
• 📄 Markup & Documentation: Markdown (.md), reStructuredText, LaTeX, Plain Text (.txt)
• ⚙️ Configuration Files: Docker, Kubernetes, Nginx, Apache configs
• 📝 Log Files: Application logs, server logs, error logs

Use Cases:

• 🔄 Compare different versions of source code before committing changes
• 📋 Track changes in documentation, contracts, or legal documents
• 🛠️ Review configuration file modifications across environments
• 📊 Analyze differences in data exports or API responses (JSON/XML)
• ✏️ Compare drafts of articles, essays, or creative writing

Note: While the tool works with any text-based format, binary files (images, videos, compiled executables) cannot be compared as they're not human-readable text.

💾 Multiple Export & Sharing Options

Code Compare provides several convenient ways to save and share your comparison results, making it easy to document changes, share with team members, or archive for future reference.

Available Export Methods:

• 📥 Download as TXT File: Click the "Download" button to save the complete diff output as a plain text file (.txt) to your computer. The file includes all added (+), removed (-), and unchanged lines with proper formatting.
• 📋 Copy to Clipboard: Use the "Copy Result" button to instantly copy the entire diff output to your clipboard. You can then paste it into emails, chat messages, documentation, or any text editor.
• 💻 Direct Display: The diff results remain visible on screen, allowing you to screenshot or manually copy specific sections as needed.

What's Included in Exports:

• ✓ Line-by-line comparison with clear visual markers (+ for additions, - for removals)
• ✓ Complete diff summary showing total added and removed lines
• ✓ All unchanged context lines for reference
• ✓ Preserves original formatting and indentation

Best Practices for Sharing:

• 🔹 Use the TXT download for formal documentation or archival purposes
• 🔹 Copy to clipboard for quick sharing in team chats or code reviews
• 🔹 For version control documentation, include the diff output in commit messages or pull request descriptions
• 🔹 When reporting bugs, attach the diff file to show exactly what changed

Privacy Note: Since all processing happens locally, you control where and how your comparison results are saved or shared. No data is automatically sent anywhere.

🔬 Smart Line-by-Line Comparison Algorithm

Code Compare uses an intelligent diff algorithm that analyzes text at the line level, similar to professional version control systems like Git. The algorithm efficiently identifies what changed, where it changed, and how it changed between two text inputs.

How the Algorithm Works:

• 📊 Line Splitting: Both text inputs are split into individual lines for granular comparison
• 🔍 Pattern Matching: Each line from the first text is compared against lines in the second text
• 🎯 Change Detection: The algorithm identifies three types of changes:
  • Additions (green/+): Lines that appear only in the modified text
  • Deletions (red/-): Lines that exist only in the original text
  • Unchanged (gray): Lines that are identical in both texts
• ⚡ Optimization: Efficient processing even for large files with thousands of lines

Customizable Comparison Options:

• 🔤 Case Sensitivity Toggle: Choose whether "Hello" and "hello" should be treated as different
  • ✓ Case Sensitive: "Hello" ≠ "hello" (strict matching)
  • ✓ Case Insensitive: "Hello" = "hello" (flexible matching)
• ⚪ Whitespace Handling: Option to ignore differences in spaces, tabs, and indentation
  • ✓ With whitespace: " hello" ≠ "hello" (exact match)
  • ✓ Ignore whitespace: " hello" = "hello" (content-focused)

Accuracy & Reliability:

• ✓ Deterministic results - same inputs always produce same output
• ✓ Handles edge cases like empty lines, special characters, and Unicode
• ✓ No false positives - only real differences are highlighted
• ✓ Preserves line order and original formatting

Common Use Cases: This algorithm is perfect for comparing code versions, tracking document edits, reviewing configuration changes, validating data exports, and identifying discrepancies in any text-based content.

🌐 Full Offline Capability - Works Anywhere, Anytime

Yes! Code Compare is designed to function completely offline after the initial page load. This makes it perfect for use in secure environments, during travel, or in areas with unreliable internet connectivity.

How Offline Mode Works:

• ✓ Initial Load: When you first visit the page, your browser downloads all necessary code (HTML, CSS, JavaScript) and caches it locally
• ✓ Full Functionality: Once loaded, you can disconnect from the internet and continue using all features without any limitations
• ✓ No External Dependencies: All comparison logic and UI components are self-contained - no external API calls or cloud services required
• ✓ Save for Later: You can save the complete HTML file to your computer and open it directly in any browser without needing internet access

Benefits of Offline Operation:

• 🔒 Enhanced Security: Perfect for air-gapped networks or secure corporate environments where internet access is restricted
• ✈️ Travel-Friendly: Compare code or documents during flights, train rides, or anywhere without WiFi
• ⚡ Zero Latency: No network delays - instant response even without internet connection
• 💻 Local Deployment: IT teams can deploy the tool on internal networks or localhost servers
• 📱 Mobile Use: Works on smartphones and tablets even in airplane mode

How to Use Offline:

• 1. Visit the page once while connected to the internet
• 2. Right-click and select "Save Page As" to download the complete HTML file
• 3. Save to your computer, USB drive, or network folder
• 4. Open the saved file anytime in any modern browser - Chrome, Firefox, Safari, or Edge
• 5. All features work identically to the online version

Note: Theme preferences and recent text inputs are saved using browser localStorage, so your preferences persist even offline.

📊 No Artificial Limits - Performance Based on Your Device

Code Compare doesn't impose any arbitrary file size restrictions or line count limits. Unlike many online tools that restrict free users to small files, you can compare texts of any size - the only limitation is your browser's memory capacity and your device's processing power.

Performance Characteristics:

• ⚡ Small to Medium Files (up to 10,000 lines): Instant comparison with no noticeable delay. Perfect for most code files, documents, and configuration files.
• 🚀 Large Files (10,000 - 50,000 lines): Processes in 1-3 seconds on modern devices. Suitable for large codebases, logs, or data files.
• 💪 Very Large Files (50,000+ lines): May take several seconds depending on device. Consider splitting extremely large files if performance becomes an issue.

What Affects Performance:

• 💻 Device Capability: Desktop computers handle larger files better than mobile devices
• 🧠 Available Memory: Browser can use available RAM for processing
• 🌐 Browser Choice: Modern browsers (Chrome, Firefox, Edge) are optimized for JavaScript performance
• 📊 Number of Changes: Files with many differences take slightly longer than files with few changes
• 🔤 Comparison Options: Case-insensitive and whitespace-ignoring modes require additional processing

Optimization Tips for Large Files:

• ✓ Close unnecessary browser tabs to free up memory
• ✓ Use case-sensitive mode when exact matching isn't needed to speed up processing
• ✓ For extremely large files (100,000+ lines), consider comparing sections at a time
• ✓ Ensure your browser is up-to-date for best performance
• ✓ Desktop browsers generally outperform mobile browsers for very large comparisons

Real-World Examples:

• 📄 Typical source code file (500-2,000 lines): Instant comparison
• 📋 Configuration or log file (5,000-10,000 lines): 1-2 seconds
• 📊 Large dataset or compiled output (20,000+ lines): 3-5 seconds
• 🗃️ Database dump or massive log (100,000+ lines): 10-30 seconds (device dependent)

No Subscription Required: Unlike premium diff tools that charge for large file comparisons, Code Compare remains completely free regardless of file size. Your only limitation is your device's hardware capability.