Text Processing

String Diff Checker

Compare two texts and see exactly what changed — added, removed, and unchanged tokens highlighted inline.

Original0 chars

Modified0 chars

How It Works

This tool uses the Longest Common Subsequence (LCS) algorithm to find the minimal set of insertions and deletions needed to transform the original text into the modified text.

Use Cases

Code review — spot logic changes at a glance
Content editing — compare document revisions
Config diff — compare configuration files
Debug — compare expected vs actual output

Word vs Character

Word mode splits on whitespace and shows which words were added or removed. Better for prose and code lines.

Character mode shows exactly which characters changed. Better for short strings, tokens, and regex patterns. To test regex against text, try the Regex Tester.