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Diff Checker
Compare two texts and instantly see every line that was added, removed, or unchanged. Download the diff output.
1 lines · 0 chars
1 lines · 0 chars
Paste text in both panels and click Compare.
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Text Diff Checker
ToolSnak's Diff Checker uses a longest common subsequence (LCS) algorithm to compare two blocks of text line by line. Lines present only in the original are highlighted red, lines added in the modified version are highlighted green, and unchanged lines are shown in gray.
Key Features
- Line-by-line diff with color-coded output
- LCS-based algorithm for accurate minimal diffs
- Ignore whitespace and case-insensitive comparison modes
- Stats: added, removed, unchanged line counts
- Download diff as .txt in unified diff format
- Swap original and modified with one click
Got Questions? We have you covered
It uses the Longest Common Subsequence (LCS) algorithm, the same approach used by Unix diff and Git. This produces the minimal edit script — showing only the lines that actually changed.
Yes. Paste any code into the two panels. The diff works on any plain text including source code, configuration files, JSON, XML, and more.
There is no hard limit, but very large texts (thousands of lines) may take a moment to process since the LCS algorithm runs in the browser.
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ToolSnak is completely free — no sign-ups, no limits. Enjoy AI writing tools, OCR, and more with zero hassle. Want to help us grow? We love your support. Thank you!
