Developer ToolsCode ValidatorsFree Tool
Dockerfile Linter
Get a pointer to hadolint, the real Dockerfile linter — this page does not actually lint your Dockerfile.
How to Use Dockerfile Linter
- 1Paste your Dockerfile content (optional — it isn't analyzed here)
- 2Click Process
- 3Follow the link to hadolint.github.io for real linting
Frequently Asked Questions
No — clicking Process shows a fixed message recommending hadolint; your Dockerfile isn't parsed or checked against any best-practice rules by this page.
Yes in name, but both currently share the same limitation — the Formatter does at least perform generic whitespace cleanup on your input, while this Linter performs no processing on your input at all, just shows the static recommendation.
hadolint.github.io — install it locally, use their online playground, or add it to your CI pipeline for real best-practice checks (like avoiding `latest` tags, minimizing layers, etc.).
No — since no real linting happens, nothing you paste is analyzed or sent anywhere.
Related Tools
JSON Validator
Validate JSON syntax in your browser using the same parser JavaScript itself uses, with the exact error message if parsing fails.
XML Validator
Validate XML well-formedness using the browser's built-in XML parser, reporting the root element and child count on success.
HTML Validator
Validate HTML5 markup for errors, accessibility issues, and best-practice warnings — instantly in your browser.
CSS Validator
Run basic heuristic checks on CSS — mismatched braces, likely missing semicolons, and empty rule blocks — not a full W3C validation.