Text Diff

比较两段文本并查看差异。
ORIGINAL
MODIFIED

Line-by-line

LCS algorithm highlights added, removed, unchanged lines.

Color Coded

Green for added, red for removed, gray for unchanged.

Real-time

Diff updates as you type.

Client-side

All processing in your browser. No data uploaded.

关于Text Diff

Comparing two versions of text is a fundamental task in writing, coding, and document management. The Text Diff tool shows you exactly what changed between two pieces of text, using the same Longest Common Subsequence (LCS) algorithm that powers version-control systems like Git. Lines added in the modified version are highlighted in green with a "+" prefix, lines removed from the original appear in red with a "−" prefix, and unchanged lines remain neutral. A summary bar at the top shows the total count of added, removed, and unchanged lines at a glance. Common use cases include reviewing document revisions before publishing, comparing configuration files when debugging a deployment issue, checking what changed in a pasted code snippet, proofreading two drafts of an article, and verifying that a find-and-replace operation produced the expected results. The diff is recalculated in real time as you type in either panel, so you can make live edits and immediately see the impact.

如何使用Text Diff

  1. Paste your original text into the left "ORIGINAL" panel.
  2. Paste the modified or newer version of the text into the right "MODIFIED" panel.
  3. The diff result appears automatically below both panels.
  4. Lines highlighted in green (with +) are new additions; lines in red (with −) were removed.
  5. Read the summary line to see the total number of added, removed, and unchanged lines.
  6. Edit either panel at any time to update the diff in real time.

常见问题

What algorithm is used for the diff?

The tool uses the Longest Common Subsequence (LCS) algorithm, which is also the foundation of the Unix diff command and Git. It finds the largest set of lines common to both texts and marks everything else as added or removed.

Does it compare word-by-word or line-by-line?

The comparison is line-by-line. Each newline creates a separate unit for comparison. For word-level or character-level diffs, you can break text into one word or character per line before pasting.

Can I use this to compare code files?

Yes. The tool works well for any plain text including source code, configuration files, JSON, SQL, and markdown. Just paste the contents of each file into the respective panels.

Is there a size limit on the text I can compare?

There is no hard limit, but very large texts (thousands of lines) may cause the browser tab to slow down since the LCS algorithm has O(m×n) time complexity. For best performance, compare sections under a few hundred lines at a time.

Can I copy the diff output?

The diff result is displayed as formatted HTML for readability. To copy the raw text of a single panel, select and copy it directly from the textarea. We plan to add a copy-diff button in a future update.

Text Diff 完全使用指南与免费在线工具

无需安装、完全免费、纯前端本地运行的高效 Text Diff 工具

用于快速解决：比较两段文本并查看差异。。无需安装复杂软件，打开网页即可立即使用，极速且安全。

为什么选择 Metoolzy 的 Text Diff？

  • 秒级即时响应: 极致性能优化，输入即可见结果。
  • 数据绝对安全: 纯浏览器本地计算，数据绝不上传服务器。
  • 完全免费使用: 无需注册登录，无任何隐形消费。

三步快速上手

  1. 打开 Metoolzy Text Diff 工具页面。
  2. 在输入区粘贴或上传您的数据。
  3. 即时查看处理结果并点击复制或下载。

功能对比表

对比项 Metoolzy Text Diff 普通在线工具 本地客户端软件
使用成本 永久免费 有次数限制或收费 需购买授权
隐私保护 纯本地内存运行 数据需上传云端 本地运行

适用人群与应用场景

  • 软件开发人员日常调试与数据转换
  • UI/UX 设计师资产处理
  • 运营与办公人员效率提升

常见问题解答 (FAQ)

处理的数据会被记录或保存吗？

绝不会。所有运算均在您的浏览器本地完成，没有任何数据回传。