⇄ Text & Code Diff Checker
Compare two files or code snippets and view differences highlighted line by line. Supports unified and split-view modes. Free online diff checker — no signup, works in browser.
Original
Modified
How to Use
1
Paste or upload texts
Enter your two texts in the left and right panels. Use the upload button to load files directly.
2
Choose view mode
Switch between Split view (side by side) and Inline view (unified diff) using the toggle.
3
Review the changes
Green lines were added, red lines were removed. Changed lines show word-level highlights inside.
Frequently Asked Questions
What is the difference between inline and split view?
Split view shows the two texts side by side, with additions highlighted green on the right and deletions in red on the left. Inline view shows both in a single column — red lines were removed, green lines were added. Split is better for reading context; inline is better for seeing exactly what changed.
Can I upload files to compare?
Yes — click "Upload File" above each panel to load any text or code file. Common formats include .txt, .js, .ts, .py, .json, .html, .css, .md, .yaml, and more. Files are read locally and never uploaded to a server.
Does this highlight word-level changes?
Yes — for lines that are similar but changed, the tool highlights the specific words or characters that differ within the line (shown with a darker background). This helps identify small changes in long lines.
Is there a size limit for comparison?
There is no hard limit, but comparisons of very large files (10,000+ lines) may be slow since everything runs in your browser. For very large codebases, a dedicated diff tool like git diff is recommended.
Is my content sent to a server?
No. The entire comparison runs in JavaScript in your browser. Your text and files never leave your device.
完整指南：代码差异比较工具
什么是diff检查器？
逐行比较两个代码或文本版本，高亮显示差异：添加（绿色）、删除（红色）和未变更的上下文（灰色）。适用于代码审查、提交前检查变更，以及了解版本间的差异。
如何使用
- 在左侧面板粘贴原始文本。
- 在右侧面板粘贴修改后的文本。
- 差异实时高亮显示。
专业技巧
- 对于文件，
git diff提供完整的Git历史上下文。 - 比较前统一空格/制表符，避免误报。
- JSON比较前先格式化以提高可读性。