文本差异比较 - 并排对比两段文本片段

将原始文本粘贴到左侧，修改后的文本粘贴到右侧。差异会被即时高亮——新增内容显示为绿色，删除内容显示为红色——采用行级最长公共子序列算法，即使内容块发生移动，匹配的行也能保持对齐。

并排视图将两段内容以平行的两栏展示，是阅读散文、合同或译文最便捷的方式。统一视图则把新增和删除内容交错显示在同一栏中，以「+」和「-」作为前缀——与 Git 所用的格式相同，方便代码审查。

可以。开启「忽略空白」后，会在比较前先合并连续的空格和制表符，从而屏蔽重新排版造成的干扰。开启「忽略大小写」后，会将两侧统一转为小写，使「Apple」和「apple」视为相同。这两个选项可同时启用。

差异比对在您的浏览器中运行，因此规模受限于可用内存而非固定上限。多达数十万字符的片段可瞬间完成计算；超大文件则可能需要稍候片刻，尤其是在同时启用忽略空白和忽略大小写时。

行级差异比对无法识别移动操作——当某个文本块从一处消失并在别处重新出现时，这两处改动会被分别报告。这与 Git 默认的差异比对行为一致，能让算法保持快速且可预期。

不会。两段内容都在你的浏览器本地进行比对。不存储、不传输、不记录任何内容，因此你可以放心比对机密合同、内部源代码或尚未发布的文案。

是的 — 这款差异对比工具适用于任何文本，包括源代码、JSON、CSV、日志和配置文件。粘贴新旧两个版本，即可在线逐行对比代码，并高亮标出每一处新增、删除或修改的行。

Yes — once a diff is showing, click Copy diff (the primary action button, or the same control in the Settings panel) to copy a plain-text version to your clipboard, formatted with a leading + for additions, − for removals, and a blank prefix for unchanged lines. The button briefly shows "Copied!" as confirmation, and the copied text can be pasted straight into a ticket, email or commit message.

Switch to Split view so the two versions read side by side like the original document, then turn on Ignore whitespace so reformatting and line-wrap differences don't clutter the result, and add Ignore case if inconsistent capitalization isn't meaningful to your review. Once the diff looks right, use Copy diff to export just the flagged changes for a reviewer or client.

Yes — each side is capped at 3,000 lines. If either the Original or Changed box goes over that, the tool stops short and shows an 'Input is too large to diff (3,000 line max per side). Compare smaller sections' warning instead of computing a result, which keeps the tab from freezing on the line-by-line comparison algorithm. If you hit this limit, split the document into smaller sections — by chapter, file or section — and diff each piece separately.