Your files stay on your device

# Dockerfile optimizer

Lint a Dockerfile for layer caching, image size, and safety problems, then read an annotated rewrite, all parsed in the tab.

Paste a Dockerfile and press Review.

This is a text review, not a build: the file is parsed line by line and graded against a named rule set, and the rewrite applies only the mechanical fixes (COPY instead of a local ADD, merging RUN lines) while the judgment calls are left as OPT comments for you to decide. It cannot run your image, verify a tag exists, or measure a real layer size, and BuildKit secrets and cache mounts are outside its rules. Everything stays in this tab.
OptionsReview

## More config file tools

- [docker run → compose](/config/docker)
- [Compose file visualizer](/config/docker-compose-visualizer)
- [umask](/config/umask)
[All config file tools](/config)

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Canonical HTML: https://nutter.tools/config/dockerfile-optimizer
Markdown version: https://nutter.tools/config/dockerfile-optimizer.md
Plain-text version: https://nutter.tools/config/dockerfile-optimizer.txt
Agent index: https://nutter.tools/llms.txt