Diff-to-Commit Message Generator
Turn unified diff output into clear, structured commit message suggestions.
Generator
Results
Diff metrics
Introduction
Good commit messages explain what changed and why the change matters. When diffs are large or repetitive, writing a clear message can become friction.
This tool parses diff output locally and produces structured commit message suggestions using Conventional Commit patterns.
How it works
The tool parses file paths, insertion counts, deletion counts, renames, additions, and deletions. It then infers a likely commit type and scope and generates message variants.
- Documentation-only diffs suggest
docs. - Dependency manifests suggest
chore(deps). - Test-only diffs suggest
test. - Style-only diffs suggest
style. - Additive code changes often suggest
feat.
How to use
- Run
git diffor copy unified diff output. - Paste the diff into the tool.
- Optionally set type, scope, and subject length.
- Generate suggestions.
- Edit the message before committing.
Practical example
A diff touching src/components/button.js,
src/styles/button.css, and README.md may produce a message
such as:
feat(button): add button disabled state
3 file(s) changed, 12 insertions(+), 0 deletions(-).Use cases
- Drafting commit messages after large refactors.
- Standardizing team commit style.
- Summarizing dependency updates.
- Preparing changelog-friendly commit headers.
- Reviewing change scope before pushing.
Best practices
- Keep the subject short and imperative.
- Use the body for context and impact.
- Mark breaking changes explicitly.
- Avoid committing unrelated changes together.
- Review generated messages before use.
Common mistakes
- Writing vague subjects such as “update code.”
- Ignoring deleted files in the message.
- Forgetting breaking-change footers.
- Using the wrong commit type.
- Trusting automation without review.
Limitations
- The tool does not read your Git repository directly.
- It cannot know the business intent behind a change.
- Type inference is heuristic.
- Breaking-change detection is advisory only.
Browser compatibility
The tool works in current versions of major browsers using standard JavaScript string parsing.
FAQ
Is my diff uploaded?
No. The diff is parsed locally in your browser.
Does it support Conventional Commits?
Yes. The primary suggestions use the type(scope): subject format.
Can I override the inferred type?
Yes. Choose a specific type from the commit type dropdown.
Should I commit generated messages without review?
No. Generated messages are drafts. Always review them for intent, accuracy, and team conventions.