Text Diff Checker
Compare Text Files and Code Snippets Online
Instantly compare two pieces of text or code to find differences, additions, and deletions. Our free text diff tool highlights changes line by line, making it perfect for code reviews, document comparisons, and content editing.
Example Comparisons
JavaScript Function Comparison
Compare two versions of a JavaScript function with added functionality
Original:
function calculateTotal(items) {
let total = 0;
for (let item of items) {
total += item.price;
}
return total;
}Modified:
function calculateTotal(items, taxRate = 0) {
let total = 0;
for (let item of items) {
total += item.price * item.quantity;
}
// Apply tax if specified
total += total * taxRate;
return Math.round(total * 100) / 100;
}Key Changes: Added tax calculation, quantity support, and rounding
HTML Structure Update
Compare original HTML with responsive design improvements
Original:
<div class="container"> <h1>Welcome</h1> <p>This is our website.</p> <button>Click me</button> </div>
Modified:
<div class="container max-w-4xl mx-auto px-4">
<h1 class="text-3xl font-bold mb-4">Welcome</h1>
<p class="text-gray-600 mb-6">This is our modern, responsive website.</p>
<button class="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded">
Click me
</button>
</div>Key Changes: Added Tailwind CSS classes and responsive design
Configuration File Changes
Compare database configuration before and after security updates
Original:
{
"database": {
"host": "localhost",
"port": 3306,
"username": "root",
"password": "password123"
},
"logging": {
"level": "info"
}
}Modified:
{
"database": {
"host": "db.example.com",
"port": 3306,
"username": "app_user",
"password": "{DB_PASSWORD}",
"ssl": true
},
"logging": {
"level": "warn",
"file": "/var/log/app.log"
},
"security": {
"enableEncryption": true
}
}Key Changes: Enhanced security, environment variables, and logging
CSS Stylesheet Optimization
Compare CSS before and after performance optimizations
Original:
.header {
background-color: #ffffff;
border: 1px solid #cccccc;
padding: 20px;
margin: 10px;
}
.button {
background-color: #007bff;
color: #ffffff;
padding: 10px 15px;
border: none;
border-radius: 4px;
}Modified:
.header {
background: #fff;
border: 1px solid #ccc;
padding: 1.25rem;
margin: 0.625rem;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.button {
background: #007bff;
color: #fff;
padding: 0.625rem 0.9375rem;
border: 0;
border-radius: 0.25rem;
transition: background-color 0.3s ease;
}
.button:hover {
background: #0056b3;
}Key Changes: Added box-shadow, transitions, and hover effects
README Documentation Update
Compare project documentation with added installation instructions
Original:
# My Project This is a simple web application. ## Features - User authentication - Data management ## Usage Run the application and navigate to the homepage.
Modified:
# My Project This is a modern web application built with React and Node.js. ## Features - User authentication with JWT - Real-time data management - Responsive design - API documentation ## Installation ```bash npm install npm run dev ``` ## Usage 1. Start the development server 2. Navigate to http://localhost:3000 3. Create an account or log in ## Contributing Please read CONTRIBUTING.md for details on our code of conduct.
Key Changes: Added tech stack, installation steps, and contributing section
SQL Query Optimization
Compare original query with performance improvements
Original:
SELECT * FROM users WHERE status = 'active' AND created_date > '2023-01-01' ORDER BY created_date
Modified:
SELECT u.id, u.username, u.email, u.created_date FROM users u WHERE u.status = 'active' AND u.created_date > '2023-01-01' AND u.deleted_at IS NULL ORDER BY u.created_date DESC LIMIT 100
Key Changes: Added specific columns, soft delete check, and pagination
Pro Tips for Better Comparisons:
- • Use Case Sensitive for code and configuration files
- • Enable Ignore Whitespace when formatting differences aren‘t important
- • Try Word-level Diff for prose and documentation
- • Use Line Numbers for easier reference when discussing changes
About Text Diff Checker
What is a Text Diff Tool?
A text diff tool compares two text documents and highlights the differences between them. It identifies additions, deletions, and modifications, making it easy to see what‘s changed. Our tool uses color coding to visualize these changes: red for deletions/original content, green for additions/modified content, and no highlighting for unchanged content.
Common Use Cases
Software Development
- Code Reviews: Compare different versions of code to identify changes and improvements
- Bug Tracking: Compare working vs. broken code to identify problematic changes
- Configuration Management: Compare server or application configuration files
- Git Workflow: Review changes before committing or merging branches
Content Creation & Editing
- Document Editing: Track revisions in articles, essays, or reports
- Content Review: Compare drafts to see what changes were made
- Plagiarism Detection: Identify similarities and differences between texts
- Translation Work: Compare original text with translated versions
Legal & Business
- Contract Comparison: Compare different versions of legal documents
- Policy Updates: Track changes in company policies or procedures
- Compliance Checking: Ensure documents meet updated regulatory requirements
- Version Control: Maintain audit trails for important business documents
Supported File Types
Our text diff checker works with any plain text format, making it versatile for various use cases:
Programming Languages
- JavaScript, TypeScript, Python, Java
- C, C++, C#, Go, Rust
- HTML, CSS, SCSS, LESS
- PHP, Ruby, Perl, Swift
Data & Configuration
- JSON, XML, YAML, TOML
- CSV, TSV, SQL
- INI, CONFIG files
- Markdown, Plain Text
Comparison Options Explained
Case Sensitive
When enabled, "Hello" and "hello" are treated as different. Disable for case-insensitive comparisons.
Ignore Whitespace
Normalizes spacing by removing extra spaces and tabs. Useful for comparing formatted vs. unformatted text.
Word-level Diff
Compares individual words instead of entire lines. Better for prose and content with line breaks.
Show Line Numbers
Displays line numbers for easy reference when discussing changes with team members.
How to Use the Text Diff Checker
- Input Text: Paste your original text in the left textarea and modified text in the right textarea
- Configure Options: Adjust comparison settings based on your needs (case sensitivity, whitespace handling, etc.)
- Compare: Click "Compare Texts" to generate the difference analysis
- Review Results: Examine the highlighted differences in the results panel
- Export: Copy the results to clipboard or download as a text file for sharing
Best Practices
• Use Line-by-Line for Code: Keep word-level diff disabled when comparing source code
• Normalize Whitespace: Enable "Ignore Whitespace" when formatting differences are not important
• Case Sensitivity: Disable for content comparisons, enable for code and configuration files
• Small Files: For best performance and readability, compare files under 10,000 lines
• Save Results: Download comparison results for documentation and review purposes
Understanding the Results
The comparison results use a color-coded system to highlight differences:
Red Background
Content that exists in the original text but was removed or changed in the modified version.
Green Background
New content that was added in the modified version or replaced content.
No Highlighting
Content that remains unchanged between both versions.
Privacy & Security
Your privacy is important to us. All text comparisons are performed entirely in your browser using JavaScript. No text data is sent to our servers or stored anywhere. Once you refresh or close the page, your data is completely removed.