Platform Engineering
Dockerfile Best Practices Checker
Paste a Dockerfile to check layer caching order, non-root user, pinned base images, and common security and size anti-patterns. Runs entirely in your browser.
No data is transmitted — everything runs locallyTool
About this tool
Dockerfile Best Practices Checker
The Dockerfile Best Practices Checker scans Dockerfiles for layer caching order, non-root user, base image pinning, and security anti-patterns including potential secret exposure.
• Check a new Dockerfile for layer caching anti-patterns before adding to CI
• Verify non-root user and image pinning before a security review
• Identify unnecessary COPY or ADD instructions bloating the final image
• Detect potential secret exposure in ARG and ENV instructions
Affiliate disclosure
Sponsored tool. This tool is brought to you by our partners. No data is collected or transmitted.
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FAQ
What does this tool tell you?
The Dockerfile Best Practices Checker scans Dockerfiles for layer caching order, non-root user, base image pinning, and security anti-patterns including potential secret exposure.
What affects the result most?
Multi-stage build detection: single-stage builds that copy dev dependencies into production image. Non-root user: USER instruction presence and numeric UID (USER 1000 preferred over USER appuser). Layer caching order: COPY package.json before COPY . — cache invalidation optimization.
How should I use the result?
Treat the tool's output as a first-pass check, not a proof of correctness. A clean pass means no issues in the patterns this tool recognizes; a failure points to a specific problem you can investigate in your source. The underlying spec is the authoritative source for edge cases.
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