Docker Image Size Estimator
Build a Dockerfile mentally — add layers and see estimated cumulative image size grow in real time.
Add a layer
Dockerfile layers
Estimated final image size
Tip: Each layer is a rough category-based estimate, not a real build. Switching to a slim or alpine base image, combining RUN commands to reduce layer count, and cleaning up package caches in the same RUN step are the biggest real-world wins for shrinking images.