Text Diff & Compare

Compare two texts and see differences highlighted. Find added, removed, and unchanged lines side by side. Free online diff tool.

Last updated: June 1, 2026

Original Text

Modified Text

What is Text Diff?

A text diff (difference) tool compares two pieces of text and highlights exactly what changed between them — additions, deletions, and modifications, shown line by line or character by character. It's the same concept used in Git version control, code review tools, and document comparison software. This is invaluable for verifying edits, reviewing revisions, comparing API responses, checking configuration changes, proofreading document versions, and anywhere you need to quickly identify what's different between two text variants.

How It Works

The tool implements a diff algorithm (similar to the Myers diff algorithm used in Git) that finds the longest common subsequence between two texts and identifies the minimal set of changes needed to transform one into the other. Results are displayed with color-coded highlighting: green for additions, red for deletions, and yellow for modifications. You can view differences at the line level (each changed line highlighted) or character level (exact changed characters within lines highlighted). Side-by-side and inline views are both available for different comparison needs.

Common Use Cases

•Comparing code changes before committing to verify only intended modifications were made
•Reviewing document revisions to quickly identify what an editor changed in your text
•Debugging API responses by comparing expected output with actual output side by side
•Verifying configuration file changes to ensure only intended settings were modified
•Comparing translated text with the original to track which passages were updated
•Checking two versions of a contract or legal document for differences before signing