Text Diff Checker
Compare text files, code snippets, or documents to find changes instantly.
Comparison Result
How Diff Algorithms Work
Ever wondered how GitHub knows exactly which lines of code you changed? It uses a mathematical concept called the Longest Common Subsequence (LCS).
Most modern diff tools (including this one) use a variation of the Myers Diff Algorithm. It treats the problem of finding differences as a graph search problem—trying to find the shortest path from the "original" state to the "modified" state while making the fewest possible deletions and insertions.
Why Use a Diff Checker?
- Code Reviews: Spot bugs by seeing exactly what changed in a file.
- Content Editing: Compare two drafts of an article to see edits.
- Config Files: Check why your server broke by comparing the old config with the new one.
Frequently Asked Questions
Is my data secure?
Yes, absolutely. This tool runs Client-Side. That means your text is processed by your own browser (using JavaScript) and is never sent to our servers. Your passwords, keys, or private code remain on your machine.
Can I compare code snippets?
Yes! This tool works great with Python, JavaScript, HTML, PHP, and practically any plain text format.
What is the difference between Line and Word diff?
Line Diff checks for changes line-by-line (great for code). Word Diff checks for changes within lines (great for prose/articles).
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