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Free Online Tool
Diff Viewer
Free online diff viewer for side-by-side text comparison with line-level highlights for code, config, and prompt changes.
View line-by-line diff
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Unified-style output
What problem does this tool solve?
Manual review misses subtle regressions when teams compare large text changes without clear diff visualization.
How to use Diff Viewer
- Paste old and new text versions in the compare workspace.
- Inspect inserted, removed, and modified lines.
- Use the highlighted diff to prepare review notes or rollout checks.
FAQ: Diff Viewer
Can Diff Viewer ignore whitespace-only changes?
Yes. Whitespace-insensitive comparison helps focus on meaningful logic or content edits.
Is it safe to compare config files that contain secrets?
Use local processing and redact secrets before sharing screenshots or copied output.
Can I use this for prompt engineering revisions?
Yes. Prompt diffs make behavior changes easier to track and discuss with your team.