Docker Layer Visualizer
Visualize the layers in your Docker image to understand their size and impact on the overall image. Identify opportunities for optimization.
Dockerfile
Docker History JSON
Docker Image
We'll analyze your Dockerfile instructions to simulate layer creation.
Run
docker history --format '{{json .}}' your-image | jq -s '.' and paste the output below
Drag and drop a Docker image tarball or click to browse
Export your image with
docker save -o image.tar your-image
Note: Your Docker image is processed locally in your browser. No data is sent to our servers.
Layer Analysis
7
Total Layers
142 MB
Total Size
15 MB
Wasted Space
85%
Efficiency Score
Layer Stack
Size Treemap
Detailed Table
Layer 7
CMD ["npm", "start"]
~0 MB
Layer 6
EXPOSE 3000
~0 MB
Layer 5
COPY . .
7 MB
Layer 4
RUN npm install
85 MB
Layer 3
COPY package*.json ./
1.2 MB
Layer 2
WORKDIR /app
~0 MB
Layer 1 (Base)
FROM node:14-alpine
50 MB
| # | Instruction | Size | Cumulative | Notes |
|---|---|---|---|---|
| 1 | FROM node:14-alpine | 50 MB | 50 MB | Base image |
| 2 | WORKDIR /app | ~0 MB | 50 MB | Metadata only |
| 3 | COPY package*.json ./ | 1.2 MB | 51.2 MB | Partially overwritten by Layer 5 |
| 4 | RUN npm install | 85 MB | 136.2 MB | Largest layer (59.8% of total) |
| 5 | COPY . . | 7 MB | 143.2 MB | Includes source code |
| 6 | EXPOSE 3000 | ~0 MB | 143.2 MB | Metadata only |
| 7 | CMD ["npm", "start"] | ~0 MB | 143.2 MB | Metadata only |
Optimization Recommendations
-
High Impact
Optimize the npm install layer
Your npm install layer (85 MB) accounts for nearly 60% of the image size. Consider using `npm ci --production` to avoid installing dev dependencies in your final image.
-
Medium Impact
Implement multi-stage builds
Use a larger image for building and a smaller image for runtime. This could reduce your final image size by up to 40%.
-
Low Impact
Reduce wasted space in package.json
Layer 3 (COPY package*.json) is partially overwritten by Layer 5 (COPY .). Consider using a .dockerignore file to exclude unnecessary files.
Want to Learn More About Docker Layer Optimization?
Check out our tutorials on optimizing Docker images, including multi-stage builds, layer optimization, and caching strategies.
Browse Tutorials