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Code Diff Viewer & Comparator

Instantly execute a side-by-side differential baseline comparison between two data strings or code files without sending proprietary code to internet servers.

What is the Text & Code Diff Viewer?

Compares two blocks of text line by line and highlights which lines are unchanged, modified, added, or removed.

How it works

Both inputs are split into arrays on newline characters, then compared index by index: if line N is identical on both sides it's marked unchanged, if both sides have a line N but the content differs it's marked modified, and if one side runs out of lines first the extra lines on the other side are marked added or removed. Because it compares by position rather than realigning content, inserting or deleting a single line in the middle of a block shows as a cascade of modified lines below it rather than a clean insertion — a true realignment would need a proper diff algorithm like Myers or patience diff.

SysAdmin & security use cases

  • Compare a config file before and after an edit to see exactly which lines changed.
  • Review two versions of a small script pasted from different branches.
  • Check whether an .env file matches the expected values line by line before deploying.
  • Spot accidental whitespace or line-ending differences between two text blocks.