A Dockerfile generator that turns a few choices — base image, language stack, install command, ports and start command — into a clean, production-ready Dockerfile you can copy or download in one click. It is built for developers who want a correct starting point without memorising every instruction, and for teams who want their images to follow the same caching and security conventions every time.
How it works
Start by picking a stack preset — Node.js, Next.js, Python, FastAPI, Go, Rust,
Ruby, PHP, Java/Maven, an nginx static site, or a blank custom image. Each preset fills
in a sensible base image, working directory, dependency-install command and default
start command, which you can then edit freely. Toggle multi-stage build to compile
in one image and ship the result in a smaller runtime image, add any number of COPY
steps and ENV variables, set the EXPOSE port, and decide whether to add a
HEALTHCHECK and a non-root USER.
The generator applies real best practices automatically. When you keep “copy lockfiles
first” enabled, it copies your manifest files (such as package.json and the lockfile)
and runs the install before copying the rest of your source, so Docker can cache the
dependency layer and skip reinstalling on every code change. It writes ENTRYPOINT and
CMD in exec form (a JSON array) so your process runs as PID 1 and receives shutdown
signals correctly. It can add a dedicated unprivileged user so the container does not run
as root. Alongside the Dockerfile it builds a matching .dockerignore tuned to your
stack, keeping node_modules, target, __pycache__, .git and secrets out of the
build context.
Everything updates live as you type, and your configuration is saved in your browser so it is waiting for you next time.
Example
Suppose you want a cache-friendly image for a Node.js service that listens on port 3000.
Choose the Node.js preset, leave the install mode on npm with copy lockfiles
first enabled, set the start command to node server.js, and keep run as non-root
on. The generator emits a Dockerfile that copies package.json and package-lock.json,
runs npm ci, then copies the rest of the source — followed by an unprivileged user, an
EXPOSE 3000, and CMD ["node", "server.js"].
Switch the preset to Go (multi-stage) and the output changes to a two-stage build: a
golang builder stage compiles a static binary, and a tiny alpine runtime stage copies
just that binary in — an image often a few megabytes instead of hundreds.
| Preset | Strategy | Typical final image |
|---|---|---|
| Node.js | single stage, slim base | small |
| Next.js | multi-stage | medium |
| Go | multi-stage, static binary | tiny |
| nginx static | copy dist/ only | tiny |
Every line is generated in your browser — your image names, commands and environment variables are never uploaded.