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Dockerfile Generator - Free Online Dockerfile Builder Tool | IconVault

Generate best practice Dockerfiles for 10 languages. Multi-stage builds, ports, workdir and env vars with live preview. Free, no signup, in browser.

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Dockerfile Generator

Best-practice Dockerfiles for 10 languages

5 of 5 free uses left

Multi-stage build

Smaller runtime image, no build tools shipped

EXPOSE port

Document which port the app listens on

5 of 5 free generations left - runs fully in your browser, nothing is uploaded.

Live preview: Node.js (multi-stage)

# Generated by IconVault Dockerfile Generator
# Build: docker build -t myapp .
# Run:   docker run -p 3000:3000 myapp

# ---- Build stage (Node.js) ----
FROM node:22-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci --omit=dev
COPY . .
RUN npm run build

# ---- Runtime stage ----
FROM node:22-alpine
WORKDIR /app
ENV NODE_ENV=production
COPY --from=builder /app /app

EXPOSE 3000

CMD ["node", "dist/index.js"]

Builds use layer caching: dependency files are copied and installed before the source so rebuilds stay fast.

About this tool

IconVault's Dockerfile Generator writes a correct, best-practice Dockerfile for your stack in seconds. Pick from 10 languages (including Node.js, Python and Go), toggle multi-stage builds for smaller images, then set the port, workdir and environment variables. The Dockerfile renders in a live preview as you change options, and you can copy or download it with one click.

Everything runs 100% in your browser: no installs, no account, nothing uploaded. The output is a solid production-style starting point using slim base images and layer-friendly instruction order, though you should still review it for your specific app before shipping. Visitors get 5 free generations with no signup; IconVault Pro ($12/year) unlocks unlimited use of every developer tool.

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