Text Comparison Tool

Quickly compare the differences between two texts, highlight the added, deleted and modified content, and improve your work efficiency. No data is uploaded to the network, it only runs in the local browser.

Original Text

Lines: 0

Modified Text

Lines: 0

Differences Comparison Result

Waiting for Comparison Analysis

Input content and click the "Compare" button to view the result

New Content Will Be Displayed Here

After comparison, the new content will be displayed here

Deleted Content Will Be Displayed Here

After comparison, the deleted content will be displayed here

Modified Content Will Be Displayed Here

After comparison, the modified content will be displayed here

New Content
Deleted Content
Modified Content

FAQs

Getting Started

What is CompareText?

CompareText is a browser-based text difference comparison tool that can help you quickly compare the differences between two texts. It uses color to highlight the additions, deletions, and modifications, allowing you to easily identify text changes.

This tool is particularly suitable for programmers to compare code, authors to compare manuscript revisions, and any scenario where text changes need to be identified.

How do I get started with CompareText?

Using CompareText is very simple:

  1. Type or paste your original content in the "Original Text" area on the left
  2. Type or paste your modified content in the "Modified Text" area on the right
  3. Click the "Compare Differences" button
  4. View the comparison results in the Difference Results area

You can also use the "Swap Contents" button to quickly switch the contents of two text areas.

Is CompareText free?

Yes, CompareText is a completely free online tool. You can use all the features without registering or paying. We will continue to provide free services, and may add advanced feature options in the future, but the core features will always remain free.

Usage Tips

How to upload files for comparison?

You can upload a text file directly for comparison:

  1. Above the original text area, click the "Upload File" button
  2. Select the text file you want to upload (supports .txt, .js, .html, .css and other formats)
  3. The file content will be automatically loaded into the text area
  4. Repeat the same operation for the modified text area
  5. Click "Compare Differences" to view the results

Please note: After the file is uploaded, the content only exists in the browser and will not be sent to any server.

How can I view only specific types of differences?

In the difference results area, we provide several tabs to help you filter specific types of differences:

What's New

Show only newly added lines in the modified text

Delete content

Only display the deleted lines in the original text

Modify content

Show the modified lines and their changes before and after

How to improve the accuracy of comparison results?

For best comparison results:

  • Make sure the text format is consistent, especially for code files
  • For large files, comparing in blocks can improve performance
  • Use the "Clear" button to ensure there is no residual content
  • Check that the line endings are consistent (different for Windows and Unix systems)
  • If the result is not as expected, try swapping the content and comparing again

Technical Questions

Which browsers does CompareText support?

CompareText supports all modern browsers, including:

Google Chrome
Mozilla Firefox
Apple Safari
Microsoft Edge

We recommend using the latest version of your browser for optimal performance and security.

Why are my comparison results inaccurate?

There are several reasons why the comparison results may be inaccurate:

  • Whitespace differences:Extra spaces or tabs may cause lines to be considered different
  • Line endings:Line endings differ between Windows (\r\n) and Unix (\n) systems
  • Encoding issues:Special characters may appear differently in different encodings
  • Formatting changes:Formatting differences may be flagged as modifications even if the content is the same

Try using the "Swap Content" button or check the text for hidden characters.

What should I do if I encounter performance issues when processing large files?

For very large files (more than 10,000 lines), the browser may be slow. Here are some optimization tips:

  • Split the file into smaller parts and compare them separately
  • Close other resource-consuming tabs in your browser
  • Make sure you are using the latest version of your browser
  • Upgrade your device hardware if possible
  • Use command-line tools to handle very large files

Pro Tip: For files with more than 100,000 lines, it is recommended to use a dedicated desktop diff tool.

Privacy and Security

Will my text content be uploaded to the server?

No! All text comparison operations are done locally in your browser, your data never leaves your device.

CompareText uses client-side processing technology, which means:

  • Your sensitive content will not be transmitted to any server
  • We cannot access the text you compare
  • All content will be cleared from memory after the page is closed
  • No need to worry about data leakage or third-party access

Do you use cookies? Why?

Yes, we use a small number of cookies to improve your experience:

Theme Preferences

Remember your light/dark mode choice

Anonymous analytics

Help us improve our products (optional)

These cookies contain no personal information and are not used for tracking purposes. You can control the use of cookies through your browser settings.

Is CompareText GDPR/CCPA compliant?

Yes, CompareText is fully compliant with privacy regulations such as GDPR and CCPA.

Since we do not process or store your text content on our servers:

  • No Data Processing Agreement (DPA) required
  • No personal data is transferred
  • No data retention issues
  • Users have full control over their own data

For the small amount of technical data we collect (such as browser type), we provide a fully transparent data processing policy.

Disclaimer

CompareText is provided "as is" without warranty of any kind, either express or implied. Your use of the service is entirely at your own risk.

We specifically disclaim any liability that:

  • The service will meet your specific requirements or expectations
  • The service will be uninterrupted, timely, secure, or error-free
  • Any results that may be obtained from the use of the service will be accurate or reliable
  • The quality of any information obtained through the service
  • Errors in the service will be corrected

CompareText shall not be liable for any direct, indirect, incidental, special, consequential or punitive damages arising out of the use of or inability to use the service, even if advised of the possibility of such damages.

Need more help?

Our support team is ready to answer any questions you may have.

support@compare-text.com

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