The Chemical Reactions Writer (CRW) converts chemical reactions typed with a keyboard to a literature accepted style. The results can be exported to HTML, Word, and Excel documents.

CRW implements a combination of free technologies that include HTML, CSS, Unicode, PHP, and AJAX. No images or additional software are used. The tool uses easy-to-memorize commands for rendering reaction arrows, greek symbols, text decorations, diacritics, and scientific symbols.

Check the advantages and limitations of the tool at

http://www.minerazzi.com/tools/chemical-reactions/writer.php