Gitignore Generator: Build Your .gitignore File

How to use the gitignore generator

1. Tick the technologies your project uses: languages, operating systems, editors and tools. You can combine as many as you like.
2. Click Generate to produce the combined file.
3. Review the output. Each technology gets its own section header so you can see where every rule comes from. Sections always appear in the same fixed order.
4. Copy the text and paste it into a .gitignore file at the root of your repository.

How This Gitignore File Generator Works

A gitignore file generator takes lists of ignore patterns for individual technologies and merges them into one file. When you select Node.js and Python, for example, the tool concatenates both template blocks, adds a comment header for each section, and removes any duplicate lines.

Deduplication matters because many environments share common ignores. The Node.js and Go templates, for example, both list .env. The generator keeps only the first occurrence. The patterns themselves are lines taken from the github/gitignore community templates, which are released under CC0, so every rule you see in a section appears in the matching upstream template. The Docker block is the only exception, because that repository has no Docker template.

Common Patterns by Technology

Knowing what gets ignored helps you understand why you need to generate gitignore rules rather than writing them from scratch. Here is a reference table of typical entries:

Each row represents dozens of real-world files that should never enter version control.

Why Deduplication Matters

If you manually copy several templates together, you end up with repeated lines. While Git handles duplicates gracefully, a bloated file becomes hard to read and maintain. When you use this tool to generate gitignore content, duplicates are stripped automatically.

For instance, selecting Node.js and Go would add .env twice, and Python, Go and Node.js all list log or environment files. The deduplication step ensures each line appears exactly once under the first header that uses it. This keeps the file short, readable and easy to audit when onboarding new team members.

Where to Place Your .gitignore

The standard location is the root directory of your Git repository. Git reads the file top to bottom and applies the patterns to every path below it. You can also place .gitignore files in subdirectories to scope rules locally, but most projects only need one at the root.

If you want global ignores that apply to every repository on your machine, configure core.excludesFile in your Git settings. That is separate from the project-level file this gitignore generator creates. Use the global file for personal editor backups and the project file for dependencies and build outputs your whole team should ignore.

Mistakes to Avoid

A common mistake is ignoring too much. If you add * or broad directory patterns without exceptions using !, you might accidentally exclude source files. Always review the generated output before committing it.

Another issue is forgetting environment-specific files. If your team uses both Windows and macOS, make sure to select both operating systems so Thumbs.db and .DS_Store are covered. Finally, never commit secrets. The Node.js, Python and Go templates already ignore .env, but ignoring a file does not remove it from history if it was committed earlier.

Worked examples