Text Diff Checker Guide
July 4, 2026
Comparing two versions of text is essential for editing, code review, and document comparison. AHX offers a free text diff checker with both line-level and word-level comparison.
Features
- • Line-level diff: Compare text line by line
- • Word-level diff: Uses LCS (Longest Common Subsequence) algorithm
- • Ignore case toggle
- • Ignore whitespace toggle
- • Swap texts button
- • Stats: added/removed/unchanged counts
- • Copy diff output
The word-level diff uses the LCS algorithm to find the longest common subsequence between two texts, then highlights additions (green) and deletions (red) inline.