# mmdc > CLI for mermaid, a diagram generation tool with a domain-specific language. > A mermaid definition file is taken as input and a SVG, PNG, or PDF file is generated as output. > More information: . - Convert a file to the specified format (automatically determined from the file extension): `mmdc --input {{input.mmd}} --output {{output.svg}}` - Specify the theme of the chart: `mmdc --input {{input.mmd}} --output {{output.svg}} --theme {{forest|dark|neutral|default}}` - Specify the background color of the chart (e.g. `lime`, `"#D8064F"`, or `transparent`): `mmdc --input {{input.mmd}} --output {{output.svg}} --backgroundColor {{color}}`