π Enter the texts to compare
π How to Use
This diff checker helps you quickly find the differences between two texts. Paste the original text into the left text area and the modified text into the right text area, then click the "Compare" button to see the result. Green highlighting shows added content, red highlighting shows deleted content, and the default style shows unchanged content.
You can also use the "Ignore Case" and "Ignore Whitespace" options to control the comparison more precisely. The "Load Example" button provides a code sample so you can try the feature. The result supports one-click copy for archiving and sharing.
β‘ Technical Principle
This tool uses the Myers diff algorithm based on the longest common subsequence (LCS) to compare texts line by line. The algorithm efficiently finds the longest common subsequence of the two texts and marks added and deleted lines accordingly. It runs in O(ND) time, where N is the number of text lines and D is the number of differences, which suits most text comparison scenarios.
πΌ Use Cases
This diff checker is useful in many scenarios: comparing different versions of code files during code review; checking the before and after of edits when proofreading articles; analyzing configuration file version changes; comparing revisions of contracts or documents; and quickly understanding what teammates changed in collaborative projects.