Dockerfile Layer-Size Estimator/Linter

Static, rule-based lint for common Dockerfile anti-patterns. No execution or build - just text analysis.

Dockerfile content

Reminder: use a .dockerignore

A .dockerignore file (excluding node_modules, .git, .env, build output, etc.) keeps the build context small and prevents accidentally baking secrets or dev-only files into the image. This can't be detected from the Dockerfile alone, so it's always shown as a reminder.

Rule-based static text analysis only - this tool never executes or builds your Dockerfile.

Was this tool helpful?

See this same kind of analysis applied to your whole repository

Call graphs, dead code, blast radius, and a health score. Results in 60 seconds, free.

Analyze a repository

Related tools

See all Docker tools →

.dockerignore Generator

Pick your stack, get a merged .dockerignore that keeps build context small.

Docker Multi-Stage Build Analyzer

Paste a Dockerfile - see if it is multi-stage and whether splitting build tooling out would help.

Docker HEALTHCHECK Generator

HTTP, TCP, or custom command to a valid Dockerfile HEALTHCHECK instruction.

Docker Compose Generator

Pick common services, get a valid docker-compose.yml with dependencies.

Runs entirely in your browser. Nothing is stored. Free forever.