What is Text Diff?
Text Diff compares two blocks of text and highlights every difference between them. Additions are marked in green, deletions in red, and modifications show both the old and new content. This tool works for any kind of text: code, configuration files, prose, log entries, or data exports.
Spotting differences between two similar texts is something developers do constantly. Whether comparing API responses before and after a change, reviewing configuration drift between environments, or verifying that a migration script produced the expected output, a visual diff saves time and catches details that manual scanning misses.
How to Use Text Diff
Paste your original text into the left panel and the modified text into the right panel. The tool immediately computes the diff and highlights changes. Use the side-by-side view for a traditional two-column layout, or switch to inline view for a single-column display with additions and deletions interleaved.
Toggle between line-level diffing, which highlights entire changed lines, and character-level diffing, which pinpoints exactly which characters within a line have changed. The ignore whitespace option is useful when comparing code that may have been reformatted.
Common Use Cases
- API response comparison: Compare API responses before and after code changes to verify that modifications produce the expected output without unintended side effects.
- Configuration drift detection: Diff configuration files between staging and production environments to identify unintended differences.
- Code review support: Compare two versions of a function or file when you do not have access to a full Git diff view.
- Data migration verification: Compare exported data before and after migration to confirm that all records transferred correctly.
- Template auditing: Diff email templates, notification messages, or UI copy between versions to ensure only intended changes were made.