Text Diff Checker

What is a Text Diff?

A text diff (short for “difference”) is the result of comparing two pieces of text to identify what has changed between them. Diff algorithms find the minimal set of insertions, deletions, and unchanged sections needed to transform the first text into the second. This is the same fundamental operation that powers git diff, code review tools, and document version tracking.

Our tool uses the Myers diff algorithm — the same algorithm used by Git — to compute the shortest edit distance between your two texts. Results are displayed with color-coded highlighting: green for additions and red for deletions.

How to Use This Diff Tool

1. Paste the original text in the left panel and the modified text in the right panel.
2. Select the diff mode: Line (compares entire lines), Word (highlights changed words), or Char (highlights individual character changes).
3. Optionally toggle Ignore whitespace or Ignore case to focus on meaningful changes.
4. Choose Side by Side or Unified view for the output.
5. Click Compare to generate the diff.

Common Use Cases

• Code review: Compare two versions of source code to see exactly what changed.
• Document editing: Track changes in contracts, articles, policies, or any written content.
• Configuration management: Find differences between config files across environments.
• Debugging: Compare API responses, log files, or test outputs to find discrepancies.
• Merge conflict resolution: Understand conflicting changes before resolving them.
• Content migration: Verify that migrated content matches the original after transformations.

Understanding Diff Output

• Green (+) indicates text that was added in the modified version.
• Red (-) indicates text that was removed from the original.
• Unmarked text is unchanged between the two versions.
• The summary shows the total count of additions, deletions, and unchanged segments.