Git Commit Message Builder & Linter
Craft, validate, and copy perfectly formatted Conventional Commits messages in seconds — with live linting and a character-limit preview.
What Is the Git Commit Message Builder & Linter?
The Git Commit Message Builder & Linter is a free, browser-based developer tool that helps you craft, validate, and copy perfectly structured commit messages following the Conventional Commits specification. Whether you're working solo or contributing to a large open-source project, this tool eliminates the guesswork from writing meaningful, machine-readable commit history.
Instead of typing freeform messages like fixed stuff or updated code, you get a guided interface that assembles every required component — type, optional scope, subject line, body, and footer — while a live linter flags errors in real time and a character-limit preview keeps your subject line within the recommended 72-character boundary.
Why Conventional Commits Matter for Every Developer
The Conventional Commits standard (heavily influenced by the Angular commit convention) defines a lightweight set of rules for creating an explicit commit history. When you follow it consistently, your repository gains several compounding benefits:
- Automated changelogs: Tools like
standard-versionandsemantic-releaseparse your commit types to generate CHANGELOG.md automatically. - Semantic versioning triggers: A
featcommit bumps a minor version; afixbumps a patch; aBREAKING CHANGEfooter triggers a major bump — all without manual intervention. - Easier code review: Reviewers immediately understand the intent of each commit without reading the diff.
- Better
git bisectandgit logfiltering: You can search for allfixcommits in a module using scoped queries. - Team alignment: New contributors onboard faster when every commit follows predictable commit message best practices.
Despite these advantages, many developers skip the standard simply because composing a compliant message from scratch is tedious. That's exactly the gap this git commit message generator fills.
How to Use the Commit Message Builder: Step-by-Step
- Select a commit type. Choose from the dropdown:
feat,fix,docs,style,refactor,perf,test,build,ci, orchore. Each type is annotated with a plain-English description so you always pick the right one. - Add an optional scope. The scope is a short noun in parentheses that names the part of the codebase affected — for example,
auth,api, orui. The builder enforces lowercase and strips invalid characters automatically. - Write your subject line. The subject is the short imperative summary of the change. The character-limit preview turns amber at 50 characters and red at 72, mirroring the Git hard-wrap recommendation.
- Optionally add a body. Use the body field to explain why the change was made, not just what changed. The tool auto-wraps lines at 72 characters.
- Add footer tokens if needed. Reference issues (
Closes #42), co-authors (Co-authored-by:), or declare a breaking change (BREAKING CHANGE: description). - Review live lint output. The commit message linter panel updates instantly, listing any violations with plain-English explanations and one-click fixes.
- Copy or export. Hit Copy to Clipboard to paste directly into your terminal, or use Export as .txt for documentation purposes.
Key Features of This Commit Message Formatter
Live Linting Engine
The linter runs on every keystroke and checks for the most common violations: missing type prefix, uppercase subject line, subject ending with a period, body not separated from subject by a blank line, and footer tokens that don't follow the token: value or token #value format. Each warning links to the relevant section of the Conventional Commits spec so you learn why the rule exists.
Character-Limit Preview Bar
Git clients, GitHub's commit list view, and many CI dashboards truncate subject lines beyond 72 characters. The visual preview bar gives you a live count and color-coded feedback — green, amber, and red — so you never accidentally write a subject that gets cut off in pull request views.
Breaking Change Detection
If you include ! after the type/scope (e.g., feat(api)!:) or add a BREAKING CHANGE: footer, the tool highlights the semantic versioning implication in a prominent banner, reminding you and your team that this commit will trigger a major version bump in automated release pipelines.
Scope Suggestions
The git commit formatter remembers scopes you've used in the current session and surfaces them as autocomplete suggestions, speeding up repeated work on the same codebase.
Commit Type Reference Table
| Type | When to Use | SemVer Impact |
|---|---|---|
feat |
A new feature visible to users or consumers of the API | Minor bump |
fix |
A bug fix that corrects incorrect behavior | Patch bump |
docs |
Documentation-only changes (README, JSDoc, etc.) | No bump |
style |
Formatting, missing semicolons — no logic change | No bump |
refactor |
Code restructuring that neither fixes a bug nor adds a feature | No bump |
perf |
Performance improvements without behavior change | Patch bump* |
test |
Adding or correcting tests | No bump |
build |
Changes to build system or external dependencies | No bump |
ci |
CI configuration files and scripts | No bump |
chore |
Maintenance tasks that don't modify src or test files | No bump |
*SemVer impact depends on your release tool's configuration.
Real-World Use Cases
Open-Source Contributors
Many popular repositories — Angular, Vue, Electron, and others — enforce the Angular commit convention via commitlint in their CI pipelines. A non-compliant message causes the entire PR check to fail. Using this semantic commit message tool before pushing means your contribution clears the linting gate on the first attempt, signaling professionalism to maintainers.
Automated Release Pipelines
Teams using semantic-release or release-please rely entirely on commit message structure to decide what version to publish and what to include in release notes. A single malformed commit can break the release automation or produce an incorrect version number. This tool acts as a pre-flight check before you ever touch the terminal.
Onboarding Junior Developers
Tech leads can share this tool with new team members as a low-friction way to teach commit hygiene without lengthy documentation sessions. The inline explanations and live feedback create a tight learning loop that sticks faster than reading a style guide.
Expert Tips for Better Commit Messages
- Use the imperative mood: Write "add login button" not "added login button" or "adds login button." Git's own generated messages (merge commits, reverts) follow this convention.
- One logical change per commit: If your commit message requires the word "and" to describe the subject, consider splitting it into two commits.
- Reference issues in footers, not subjects: Putting
Closes #42in the footer keeps the subject line clean and still triggers GitHub's auto-close behavior. - Explain the why in the body: The diff already shows what changed. The body is your opportunity to document the reasoning, trade-offs, or linked design decisions.
- Avoid vague scopes: Scopes like
miscorgeneraladd noise without signal. Use module names, package names, or feature area names.
Common Mistakes the Linter Catches
Even experienced engineers make these errors under deadline pressure. The commit message linter flags all of them automatically:
- Starting the subject with a capital letter (
Fix login bugshould befix: login bug) - Ending the subject with a period
- Missing the colon and space after the type (
feat logininstead offeat: login) - Using past tense in the subject (
fixed,updated) - Exceeding 72 characters in the subject line
- No blank line between subject and body
- Malformed footer tokens that won't be parsed by release tools
Conclusion
Writing great commit messages is a discipline that pays dividends across the entire software development lifecycle — from cleaner pull requests and faster code reviews to fully automated releases and self-documenting changelogs. The Git Commit Message Builder & Linter removes every friction point: it guides your structure, enforces commit message best practices, and validates your output before it ever reaches your repository. Bookmark it, share it with your team, and make every commit count.
Frequently asked questions
What is the Conventional Commits specification and why should I follow it?
Conventional Commits is a lightweight convention on top of commit messages that provides a consistent, human- and machine-readable history. It defines a structured format: <type>[optional scope]: <description>, with an optional body and footer. Following it enables automated changelog generation, semantic versioning triggers, and easier repository navigation. Tools like semantic-release, release-please, and standard-version rely on it to determine version bumps and build release notes without manual effort.
What is the difference between 'feat' and 'fix' commit types?
A 'feat' commit introduces a new feature — something that adds capability from the user's or API consumer's perspective. It triggers a minor version bump (e.g., 1.2.0 → 1.3.0) in semantic versioning. A 'fix' commit corrects a bug or incorrect behavior without adding new functionality, and it triggers a patch version bump (e.g., 1.2.0 → 1.2.1). Choosing the wrong type can cause your automated release pipeline to publish the incorrect version, so the distinction matters beyond just documentation.
How do I indicate a breaking change in a conventional commit message?
There are two ways to mark a breaking change. First, append an exclamation mark after the type and scope: for example, 'feat(api)!: remove deprecated endpoints'. Second, add a 'BREAKING CHANGE: <description>' token in the commit footer. Either method signals to release tools that a major version bump is required (e.g., 1.2.0 → 2.0.0). The builder highlights both approaches and shows a warning banner whenever a breaking change is detected so you don't accidentally trigger a major release.
Can I use this tool with commitlint and Husky in my project?
Absolutely. This tool follows the same rules enforced by @commitlint/config-conventional, which is the most widely used commitlint configuration. You can use the builder to compose and validate your message here, then paste it into your terminal when running 'git commit -m'. Alternatively, use 'git commit' without the -m flag to open your editor, paste the pre-validated message, and save — it will pass commitlint's Husky pre-commit hook cleanly.
Why does the subject line have a 72-character limit?
The 72-character limit is a long-standing Git convention rooted in terminal display widths and the way tools like 'git log --oneline', GitHub's commit list, and many CI dashboards render commit subjects. Lines longer than 72 characters are often truncated with an ellipsis, hiding important context. The 50-character soft limit is an additional best practice for even cleaner one-line log output. The character-limit preview bar in this tool uses color-coded feedback — green under 50, amber at 51–72, red over 72 — to keep you within both thresholds.
Does this tool store or transmit my commit messages?
No. The Git Commit Message Builder & Linter runs entirely in your browser. All composition, linting, and formatting happens client-side using JavaScript. Nothing you type is sent to a server, logged, or stored beyond your current browser session. This makes it safe to use even when writing commit messages that reference internal ticket numbers, proprietary module names, or sensitive project details.