Since a direct online tool is rare or non-existent, the most reliable "free" method requires a two-step approach or the use of legacy software.
PMD files are "proprietary," meaning they require specific, often expensive, software to view. pmd to jpg converter online amp free free
A legacy desktop publishing format.
Since PMD is a document layout format, many image converters may fail to render the text and images correctly. A more reliable method is to first convert the PMD to a PDF, then to a JPG: Since a direct online tool is rare or