Dockerfile Generator

Build a production-ready Dockerfile visually. Pick a language preset, configure the base image, multi-stage build, env vars, ports, non-root user, and start command — copy the result when you're done.

Language Presets

Build

Runtime

Environment Variables (ENV)
Build Args (ARG)

No build args. Add ARG for values you pass at build time with --build-arg.

Non-root user (USER)
CMD form
Healthcheck (optional)
Labels (LABEL)

No labels. Add OCI labels like org.opencontainers.image.source.

Generated Dockerfile

Save as Dockerfile at your project root, then run docker build -t my-app ..

# syntax=docker/dockerfile:1

FROM node:20-alpine

WORKDIR /app

COPY package*.json ./
RUN npm ci --omit=dev

COPY . .

EXPOSE 3000

USER node

HEALTHCHECK --interval=30s --timeout=5s --retries=3 CMD wget -qO- http://localhost:3000/ || exit 1

CMD ["node", "server.js"]

Matching .dockerignore

Adapts to your base image. Save next to the Dockerfile to keep the build context small.

.git
.gitignore
.dockerignore
Dockerfile*
docker-compose*.yml
README.md
LICENSE
.env
.env.*
*.log
node_modules
npm-debug.log
dist
build
.next
coverage
.cache

About Dockerfile Generator

The Dockerfile Generator is a free online tool that builds copy-ready Dockerfile scripts from a simple form. Instead of memorizing instruction order, cache-friendly layering, and multi-stage syntax, you pick a language preset and adjust a few fields — the tool emits idiomatic, production-minded Docker instructions you can drop straight into your project.

A Dockerfile turns your application into a portable container image: a single artifact that runs the same on your laptop, in CI, and in production. This generator covers the instructions that matter most — FROM, cache-friendly dependency installs, multi-stage builds, ENV, EXPOSE, a non-root USER, HEALTHCHECK, and a signal-friendly CMD — and generates a matching .dockerignore.

Everything runs locally in your browser. Your image names, environment variables, and commands are never sent to a server. Pair it with the Docker Compose Generator to wire the resulting image into a multi-container stack.

How to Use Dockerfile Generator

  1. 1. Pick a language preset (Node, Python, Go, Rust, Java, PHP, Ruby, .NET, or static/SPA) to load sensible defaults.
  2. 2. Set the base image — the image field autocompletes common official images. Toggle multi-stage build to compile in one image and ship a smaller runtime image.
  3. 3. Adjust the dependency files and install command. Copying these before the rest of the source keeps Docker's layer cache effective.
  4. 4. Add an optional build command and, for multi-stage builds, the artifacts to copy from the builder stage into the runtime image.
  5. 5. Configure ENV variables, EXPOSE ports, a non-root USER, an optional HEALTHCHECK, and the start CMD (exec form is recommended).
  6. 6. Click Copy, save as Dockerfile, copy the matching .dockerignore, then run docker build -t my-app ..

Common Use Cases

Containerizing a new app

Get a correct, cache-friendly Dockerfile in seconds instead of copying a half-remembered one from an old project.

Shrinking image size

Switch a single-stage build to multi-stage so compilers and dev dependencies never reach the final image.

Standardizing across a team

Generate consistent Dockerfiles for every microservice with the same non-root user, healthcheck, and label conventions.

Learning Docker

See how FROM, COPY, RUN, USER, and CMD fit together for your language, with a matching .dockerignore explained.

CI/CD pipelines

Produce a reproducible build image for GitHub Actions, GitLab CI, or any registry-based deploy.

Static sites & SPAs

Build a Vite/React/Vue bundle in Node, then serve the dist/ folder from a tiny nginx image.

Frequently Asked Questions