About Text Diff Checker

Side-by-side text comparison tool that performs line-by-line diffing with word-level highlighting on modified lines. Paste two versions of text, and the tool identifies additions (green), deletions (red), and changes (yellow with inline word-level markup showing exactly which words were added or removed). Displays statistics for total additions, deletions, and modifications. Results export as a unified diff report.

• Line-based diff algorithm compares text A and B sequentially, categorizing each line as equal, added, removed, or changed
• Changed lines get a secondary word-level diff: splits on whitespace boundaries and highlights individual word additions/removals inline
• Statistics panel counts additions, deletions, modifications, and total lines processed
• Unified diff view uses color-coded borders: green (+), red (-), yellow (~) with a legend
• Export generates a timestamped report with statistics, unified diff, and both original texts

Frequently Asked Questions

What diff algorithm does this use?

A straightforward sequential line comparison—not a longest-common-subsequence (LCS) algorithm like git diff. It compares lines at matching positions, so inserted or deleted lines can cause subsequent lines to show as changed rather than shifted. For most quick comparisons of two similar texts, this works well. For complex multi-line insertions, a git-style diff will give better results.

Can I compare code files?

Yes, but it treats input as plain text with no syntax awareness. It won’t ignore whitespace-only changes or understand language-specific constructs. For code review, use a dedicated diff tool; for quick prose or config comparisons, this is faster.