Does it add missing tags?

No, it only re-indents the markup you provide.

Are void elements handled?

Yes, tags like and do not add a closing line.

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Indent HTML tags so the document structure is easy to read. Local, free, no signup.

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Does it add missing tags?: No, it only re-indents the markup you provide.
Are void elements handled?: Yes, tags like <br> and <img> do not add a closing line.