A beautiful demo is worth a thousand words:
What is pdf2htmlEX?
pdf2htmlEX renders PDF files in HTML, utilizing modern Web technologies, aims to provide an accuracy rendering, while keeping optimized for Web display. Text, fonts and formats are natively perserved in HTML, math formulas, figures and images are also supported.
pdf2htmlEX is also a publishing tool, almost 50 options make it flexible for many different use cases: PDF preview, book/magzine publishing, personal resume...
More info at coolwanglu/pdf2htmlEX@github.