Digital ToolPad

Powerful Online Diff Checker

Compare two text documents with our advanced GitHub-style diff viewer. Perfect for code reviews, document comparisons, and version control.

Original

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Modified

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Diff Result

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Removed
Modified
Character added
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Modified
1
function calculateTotal(items) {
1
function calculate(items, tax = 0) {
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let total = 0;
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let total = 0;
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for (let i = 0; i < items.length; i++) {
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for (let i = 0; i < items.length; i++) {
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total += items[i].price;
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total += items[i].price * items[i].quantity;
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}
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}
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return total;
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return total * (1 + tax);
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}
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}
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8
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const cart = [
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const cart = [
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{ name: "Apple", price: 1.50 },
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{ name: "Banana", price: 0.75 }
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{ name: "Apple", price: 1.50, quantity: 2 },
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{ name: "Banana", price: 0.75, quantity: 3 },
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{ name: "Orange", price: 2.00, quantity: 1 }
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];
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];
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console.log("Total:", calculateTotal(cart));
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const taxRate = 0.08;
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console.log("Total with tax:", calculateTotal(cart, taxRate));

Comparison Options

Powerful Diff Checker Features

GitHub-Style Visualization

Professional side-by-side diff view with character-level highlighting, just like GitHub's interface.

Advanced Algorithm

Powered by the industry-standard diff algorithm for accurate and reliable text comparisons.

Modern Interface

Beautiful, responsive design with advanced comparison options and intuitive controls.

How to Use Our Diff Checker

1Getting Started

Paste or type your text: Enter your original text in the left editor and the modified version in the right editor. Our Monaco editor supports syntax highlighting and provides a professional editing experience.

Open files directly: Click the "Open File" button in either panel to load text files from your computer. Supports all common text formats including source code (.js, .py, .java), markup (.html, .xml, .md), data files (.json, .csv, .yaml), and plain text.

Configure options: Use the comparison options to ignore whitespace or case sensitivity based on your needs. These settings help you focus on meaningful changes.

2Understanding Results

GitHub-style visualization: Our diff viewer shows changes in a familiar two-column format. Green highlights indicate additions, red shows deletions, and character-level differences are highlighted within lines.

Line numbering: Original line numbers appear on the left, modified line numbers on the right, making it easy to reference specific changes in your source documents.

Export results: Copy the diff to clipboard or download as a text file for documentation, code reviews, or sharing with team members.

Perfect for Multiple Use Cases

👨‍💻Developers

  • Code review and comparison: Compare different versions of source code files
  • Version control diff checking: Understand Git changes before committing
  • Configuration file changes: Track changes in config files safely
  • API response comparison: Compare JSON responses for testing
  • Database schema changes: Review SQL script modifications
  • Merge conflict resolution: Understand conflicting changes

📝Content Writers

  • Document revision tracking: See exactly what changed between drafts
  • Article version comparison: Compare different versions of articles
  • Contract change detection: Review legal document modifications
  • Editorial review process: Track editor suggestions and changes
  • Translation comparison: Compare original and translated content
  • Content migration: Verify content moved between platforms

🏢Business Users

  • Policy comparison: Track changes in company policies
  • Specification reviews: Compare project requirements versions
  • Report analysis: See differences between report versions
  • Proposal tracking: Monitor changes in business proposals
  • Email comparison: Compare different versions of communications
  • Data validation: Verify data accuracy between sources

Advanced Features & Tips

🛠️ Advanced Options

Ignore Whitespace

Perfect for comparing code where formatting changes don't matter. This option treats multiple spaces, tabs, and line breaks as equivalent, focusing on content changes only.

Ignore Case

Useful for comparing text where capitalization differences aren't significant. Great for comparing user-generated content or case-insensitive data.

Character-Level Highlighting

Our advanced algorithm highlights individual character changes within lines, making it easy to spot subtle modifications in large text blocks.

💡 Pro Tips

Large Files

For comparing large files, use the ignore whitespace option to reduce noise. The tool can handle substantial text sizes efficiently with our optimized diff algorithm.

Copy & Share

Use the copy button to quickly share diff results in emails, documentation, or issue trackers. The standard diff format is compatible with most development tools.

Keyboard Navigation

Use standard keyboard shortcuts in the editors (Ctrl+A, Ctrl+C, Ctrl+V) for efficient text manipulation. The Monaco editor supports advanced editing features.

Frequently Asked Questions

What file types can I compare?

Our diff checker works with any text-based content including source code (JavaScript, Python, Java, C++, etc.), markup languages (HTML, XML, Markdown), data formats (JSON, CSV, YAML), configuration files, and plain text documents. Use the "Open File" buttons to load files directly from your computer.

How do I load files from my computer?

Simply click the "Open File" button in either the Original Text or Modified Text panel. You can select any text-based file from your computer, and the content will be automatically loaded into the editor. This works with all common file formats and extensions.

Is there a file size limit?

The tool can handle substantial text sizes efficiently. For very large files (>1MB), we recommend using the "ignore whitespace" option to improve performance and reduce visual noise in the comparison.

How accurate is the diff algorithm?

We use the industry-standard Myers diff algorithm, the same algorithm used by Git and other professional version control systems. This ensures highly accurate and reliable difference detection.

Can I use this for code review?

Absolutely! Our GitHub-style diff viewer is perfect for code reviews. It shows line-by-line changes with syntax highlighting and character-level differences, making it easy to spot bugs and review modifications.

Is my data secure and private?

Yes, completely! All text comparison happens locally in your browser. No data is sent to our servers, uploaded, or stored anywhere. Your sensitive documents and code remain private and secure.

Can I export the diff results?

Yes! You can copy the diff results to clipboard or download them as a text file. The exported format follows standard diff conventions, compatible with development tools and documentation systems.

Why Choose Our Online Diff Tool

🚀

Lightning Fast

Optimized algorithms ensure instant comparison results, even for large files. No waiting, no loading screens - just immediate, accurate diffs.

🔒

100% Private

Client-side processing means your sensitive data never leaves your computer. Perfect for confidential documents, proprietary code, and private content.

✨

Professional Quality

GitHub-style interface with Monaco editor provides a professional experience that developers and content creators trust.

Privacy-First Tool

Your data never leaves your browser. Everything happens in your browser. No uploads needed. Ensuring complete privacy and security. No registration, no data collection, no server uploads.

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