Developer ToolsCode FormattersFree Tool
Dockerfile Formatter
Clean up whitespace and blank lines in a Dockerfile — a light touch-up, not a Dockerfile-aware reformatter.
How to Use Dockerfile Formatter
- 1Paste your Dockerfile content
- 2Click Process
- 3Copy the whitespace-cleaned output
- 4For real linting, run it through hadolint or your IDE's Docker extension
Frequently Asked Questions
No — it only performs generic whitespace cleanup (collapsing 3+ blank lines, trimming trailing spaces). It doesn't validate instruction order, syntax, or best practices.
hadolint.github.io is a dedicated Dockerfile linter that checks syntax and best practices — this tool's own output recommends it for anything beyond basic whitespace cleanup.
No — the Dockerfile Linter (in Code Validators) is a separate tool that points you to hadolint for real linting; this Formatter only does whitespace cleanup. Neither performs real Dockerfile-aware validation itself.
No — cleanup runs entirely in your browser.
Related Tools
HTML Prettifier
Reformat HTML with proper nested indentation based on actual tag depth, handling void elements like <br> and <img> correctly.
CSS Prettifier
Reformat minified or messy CSS with a newline after each rule, selector, and declaration for readability.
SCSS Formatter
Clean up whitespace and blank lines in SCSS/Sass code — a light touch-up, not a full SCSS-aware reformatter.
LESS Formatter
Clean up whitespace and blank lines in LESS stylesheet code — a light touch-up, not a full LESS-aware reformatter.