.git.gitignore.dockerignore.env*Dockerfile*docker-compose**.md.github/ .gitlab-ci.yml .circleci/.vscode/ .idea/*.logtmp/ temp/docs/The .dockerignore Generator is a free online tool that helps developers configure Docker build ignore rules through a visual interface. It supports Node.js, Python, Java, Go, Rust, and PHP project templates with pre-configured language-specific rules. Supports custom rules, select/deselect all operations, and one-click .dockerignore generation. All operations run locally in your browser.
1. Select a template: Click your project's language template to auto-select general and language-specific rules
2. Adjust rules: Check/uncheck ignore rules based on your project needs
3. Add custom rules: Enter project-specific ignore patterns in the custom rules area
4. Preview: The output area shows the final .dockerignore content in real-time
5. Export: Copy to clipboard or download as .dockerignore file
Developers exclude node_modules, .git, and other large directories to reduce build context size and speed up docker build.
Exclude .env files, key files, and configs to prevent sensitive information from being accidentally included in Docker images.
Optimized .dockerignore ensures only necessary files enter the build context, reducing build time and resource consumption in automated pipelines.
Select appropriate language templates for different services in polyglot projects to quickly generate suitable .dockerignore files.
.dockerignore sits in the project root. Docker CLI reads it during docker build — matched files and directories are excluded from the build context. Syntax matches .gitignore, supporting wildcards (*, **, ?) and negation (!). Key points: .dockerignore takes effect before Dockerfile's COPY/ADD; excluded files can't be used in Dockerfile; ! negation re-includes previously excluded files; build context size directly impacts transfer time and build speed.
Like .gitignore, it specifies files/directories to exclude from Docker build context, reducing size, speeding builds, and preventing data leaks.
.gitignore controls Git exclusions; .dockerignore controls Docker build context exclusions. Same syntax, different purposes. .dockerignore typically excludes more.
Without it, Docker sends the entire project to the daemon, including node_modules, .git, logs — causing slow builds, bloated images, and potential data exposure.
Node.js, Python, Java, Go, Rust, and PHP templates with pre-configured language-specific rules.
Yes. Place the generated .dockerignore in your project root and it takes effect immediately.
No. All generation logic runs locally in your browser. Your project info never leaves your device.
Yes. Supports *, **, ?, and ! patterns — same syntax as .gitignore.