The acquisition would provide Box's users with more interactive features such as the ability to annotate documents or create slide shows, said Aaron Levie, Box's chief executive.
Levie declined to disclose the terms of the deal. Crocodoc, a seven-person start-up founded in 2007 by four engineering students from the Massachusetts Institute of Technology, had previously raised roughly $1 million from angel investors.
At the heart of Crocodoc's technology is the ability to convert documents in such formats as Word and PDF into ones more suitable for the interactive Web.
Crocodoc said its licensing deals with existing customers, which include LinkedIn Corp, would continue without interruption although the technology could be rebranded.
Faced with competition from giants such as Microsoft Corp and Google Inc, young storage companies like Box and Dropbox in recent months have sought to differentiate themselves and aggressively flesh out their functionality through small acquisitions.
Privately held Dropbox, one of Box's fiercest rivals, signaled it would also expand its offerings when in March it snapped up the design team behind Mailbox, an email app.
© Thomson Reuters 2013