Diff Checker Online — Free Text & Code Comparison Tool

Compare text, contracts, code files, and documents side-by-side to highlight added, removed, and modified lines.

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使用方法

  1. 1
    選擇設定

    填寫資訊或選擇您需要的選項。

  2. 2
    檢視結果

    更改任何內容時,預覽會立即更新。

  3. 3
    下載或儲存

    將結果儲存到您的裝置。不會向伺服器傳送或儲存任何內容。

關於此工具

Spot every single difference between two versions of text or code. Features side-by-side dual panes, unified inline view, whitespace-ignoring options, case-insensitive comparison, and instant addition/deletion counter. 100% private: comparison executes in-browser using fast Myers LCS algorithms.

獲得最佳結果的提示

開始之前請花一點時間閱讀選項,並先用一個小例子試用工具。一切都在您裝置的瀏覽器中執行;您輸入或新增的任何內容都不會被上傳,關閉標籤頁會清除所有內容。如果看起來不對,請重新整理頁面重試,或使用本頁的報告連結告訴我們出了什麼問題。如果結果仍然看起來不對,請每次只更改一個值,看看哪個輸入影響最大。如果您還會再用,請收藏此頁。

要點

常見問題

How does the diff checker identify differences?

It uses the Longest Common Subsequence (LCS) algorithm to track insertions (green) and deletions (red) with line numbers.

Can I ignore spaces and case sensitivity?

Yes, toggle 'Ignore Whitespace' or 'Ignore Case' to focus solely on meaningful content changes.

Can I use it to compare programming code?

Yes, it works flawlessly for Python, JavaScript, HTML, CSS, JSON, SQL, and plain text.

Is there any confidentiality risk with sensitive documents?

Zero risk. Your text is processed entirely inside your local browser tab and never sent to any server.

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