It looks like that you cannot just simply convert HTML to HTML5 with some kind of dedicated utility. You will need to manually update your HTML to HTML5 specifications so it is HTML5 valid. You can find more information at HTML5 migration website.
Home > Search converters: htm to html5
Conversion of htm file format to html5 file format beta
Search for htm to html5 converter or software able to handle these file types.
Convert HTML Hypertext Markup Language web page to HTML5 Hypertext Markup Language revision 5 source.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software 
- convert htm to html5 on OS X
Adobe Dreamweaver for Mac
Mac version of popular web authoring and editing software
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from htm file | No | Yes | Yes | htm editor | Yes | No | No | No |
to html5 file | No | Yes | Yes | html5 editor | Yes | No | No | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open htm file, Open html5 file
HTM
A htm file extension is used for web documents stored in HTML Hypertext Markup Language file format. HTML language provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists, links, quotes and other items. Its the main language for writing web pages. A htm web page can be displayed in any Web browser.
HTML5
Files with html5 extension can be sometimes found as html5 source codes for web pages. Usually the extension is just HTML.
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