Text Diff Checker

Compare two texts and see the differences instantly. Find additions, deletions, and changes with highlighted visualization. Perfect for code review and content comparison.

0 chars0 words0 lines
0 chars0 words0 lines

Comparison Options

Try Example

What is Text Diff Checker?

A text diff checker (or text comparison tool) identifies and highlights differences between two pieces of text. It's an essential tool for developers, writers, and anyone who needs to compare documents, code, or content to see what has changed.

Our diff checker analyzes both texts line by line and highlights additions (green), deletions (red), and unchanged content. This makes it easy to spot exactly what's different between two versions of a document.

How Text Comparison Works

The diff checker uses algorithms to compare texts and identify differences:

  • Line-by-Line Analysis: Compares text line by line to identify changes
  • Addition Detection: Highlights lines that exist in the modified text but not in the original
  • Deletion Detection: Shows lines that were removed from the original text
  • Change Detection: Identifies lines that were modified
  • Context Preservation: Shows unchanged lines for context
  • Visual Indicators: Uses color coding for easy identification of changes

Common Use Cases

  • Code Review: Compare different versions of code files
  • Document Comparison: Find changes between document drafts
  • Content Editing: Review edits and revisions to articles or posts
  • Data Validation: Verify data integrity between sources
  • Configuration Files: Compare config files across environments
  • Translation Review: Compare original and translated content
  • Version Control: Quick comparison before committing changes
  • Plagiarism Check: Identify similarities and differences in texts

Understanding Diff Indicators

+
Addition (Green)

Lines that were added to the modified text. These lines don't exist in the original.

-
Deletion (Red)

Lines that were removed from the original text. These lines don't appear in the modified version.

 
Unchanged (Gray)

Lines that are identical in both texts. Shown for context.

Comparison Options Explained

Case Sensitive

When enabled, treats uppercase and lowercase letters as different. For example, "Hello" and "hello" would be considered different. Disable this to ignore case differences.

Ignore Whitespace

When enabled, ignores differences in spaces, tabs, and other whitespace characters. Useful when formatting changes shouldn't be considered as differences.

Trim Line Ends

When enabled, removes trailing whitespace from the end of each line before comparison. Prevents invisible whitespace differences from affecting results.

FAQ

Yes, the tool can handle large texts. However, very large files (>1MB) may slow down your browser as all processing happens client-side. For huge files, consider using command-line diff tools.
Absolutely! All text comparison happens entirely in your browser. Your texts are never sent to any server, and nothing is stored or logged. Your data remains completely private.
Yes! The diff checker works great for comparing code files. You can compare JavaScript, Python, HTML, CSS, or any text-based code. The line-by-line comparison makes it easy to spot code changes.
Version control systems like Git use similar algorithms but include additional features like file history and branch management. This tool is perfect for quick, one-off comparisons without needing to set up version control.
Yes! Use the "Copy Diff" button to copy the differences to your clipboard. You can then paste the results into a document, email, or issue tracker for sharing or documentation.

Best Practices

  • Paste Complete Texts: Include full context for accurate comparison
  • Use Appropriate Options: Enable case-sensitive for code, disable for prose
  • Review Context: Check unchanged lines around differences for full understanding
  • Document Changes: Copy and save important diff results for records
  • Compare Clean Versions: Remove unnecessary formatting before comparing
  • Line-by-Line Works Best: Format text with proper line breaks for better results
  • Test Options: Try different comparison options if results aren't as expected

Usage Tips

  • Paste your original text in the left panel and modified text in the right panel
  • Use the case-sensitive option when comparing code or technical content
  • Enable "Ignore whitespace" to focus on content changes, not formatting
  • Green lines show additions, red lines show deletions
  • Click "Copy Diff" to share comparison results with your team
  • Clear individual panels with the × button in the header
  • Try the example to see how the diff checker works
  • Bookmark this tool for quick access during code reviews

Other Tools

Secure Password Generator

Generate strong, random passwords with customizable options

UUID Generator

Generate RFC4122 compliant unique identifiers

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 strings

URL Encoder/Decoder

Encode URLs and query parameters safely

JWT Decoder

Decode and inspect JSON Web Tokens

Slugify - URL Slug Generator

Convert text to SEO-friendly URL slugs

JSON Formatter

Format, validate, and beautify JSON data

Color Picker & Converter

Pick colors and convert between formats

Box-Shadow Generator

Create CSS box-shadows with live preview

Lorem Ipsum Generator

Generate placeholder text for designs

Regex Tester

Test and debug regular expressions online