HEVEA is a LaTeX to HTML translator. The input language is a fairly complete subset of LaTeX2e (old LaTeX style is also accepted) and the output language is HTML that is (hopefully) correct with respect to version 5. Exotic symbols are translated into the so-called HTML 'entities', in other words into references to UNICODE chararacters. HEVEA understands LaTeX macro definitions. Simple user style files are understood with little or no modifications. Furthermore, HEVEA customization is done by writing LaTeX code. HEVEA is written in OCaml, as many lexers. It is quite fast and flexible. Using HEVEA it is possible to translate large documents such as manuals, books, etc. very quickly. All documents are translated as one single HTML file. Then, the output file can be cut into smaller files, using the companion program HACHA.