Is this tool free to use?

Yes, this tool is completely free to use. No registration, subscription, or payment is required. All processing happens directly in your browser.

Does this tool upload data to a server?

No. All processing happens locally in your browser using JavaScript. Your data never leaves your device, ensuring complete privacy and security. The tool works even when offline.

Does this tool work on mobile devices?

Yes, this tool is fully responsive and works on all modern browsers including Chrome, Safari, Firefox, and Edge on desktop, tablet, and mobile devices.

Is an internet connection required to use this tool?

No internet connection is required after the page loads. Since all processing happens in your browser, you can use this tool offline once the page is loaded.

Is there a file size limit?

There is no server-side file size limit since files are processed locally in your browser. The only limitation is your device's memory (RAM). For very large files, we recommend processing them in smaller chunks.

🔍 Code Diff Checker

Free online code diff checker. Compare two versions of text or code side by side. Highlights added, removed, and changed lines with line numbers and dark theme. Client-side only, no data uploaded.

Original (Old)

Modified (New)

Click "Compare" to see the diff

How to Use the Code Diff Checker

Validate your content with the Code Diff Checker in three steps:

Enter Content to Validate
Type, paste, or upload the content you want to validate into the input area. The tool accepts direct text input and file upload for batch processing.
Run Validation
Click the "Validate" or "Check" button to analyze your content. The tool performs a thorough check and provides detailed feedback, including error locations and suggested fixes.
Review Results
View the validation results, including any errors, warnings, or success messages. If errors are found, the tool highlights their exact location to help you fix them quickly.

FAQ

代码差异对比工具支持哪些格式？

本工具支持任意文本格式的对比，包括但不限于：JavaScript、Python、Java、C++、HTML、CSS、JSON、XML、Markdown、YAML等编程语言和标记语言。纯文本对比，不限制语言类型。

对比的数据会上传到服务器吗？

不会。本工具完全在浏览器本地运行，所有对比操作都在你的电脑上完成。没有任何数据上传到服务器，确保代码和文本的隐私安全。

差异对比的原理是什么？

本工具使用 Myers 差异算法（一种高效的最长公共子序列算法），逐行对比两个文本的不同之处。能够精确识别新增行(绿色)、删除行(红色)和修改行(黄色)，并显示行号便于定位。

最大支持多少行的对比？

本工具对文本大小没有严格限制，但建议每边不超过5000行或500KB。过大的文本可能导致浏览器响应变慢，因为对比计算在浏览器本地进行。