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 code snippets with visual highlighting for additions, deletions, and modifications. Supports line-by-line and character-level diff. Great for code review and version comparison.

Original Version

function greet(name) {
  console.log("Hello, " + name);
  return true;
}

Modified Version

function greet(name) {
  console.log("Hi, " + name);
  return true;
}

function farewell(name) {
  console.log("Goodbye!");
}

Click "Compare" to see diff

💡 Tip: 🟢 Added 🔴 Removed 🟡 Modified

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

支持哪些代码差异对比方式？

支持逐行对比和字符级对比。逐行对比以行为单位比较差异，适合代码审查。字符级对比精确到每个字符的变化，适合文本校对。可以通过右上角的选项卡切换对比模式。

颜色标记代表什么？

绿色高亮表示新增的内容（仅在右侧版本中存在），红色高亮表示被删除的内容（仅在左侧版本中存在），黄色高亮表示修改过的内容。没有背景色的表示内容相同。

可以对比大文件吗？

建议每次对比不超过500行代码，以保证浏览器流畅运行。如果需要对比大型文件，建议分段对比。所有对比完全在浏览器本地完成，不上传任何数据。

对比结果可以复制吗？

可以。你可以点击'复制差异'按钮，将带标记的差异结果复制到剪贴板。复制的内容包含颜色标记，方便粘贴到其他文档中使用。