What is an OBML15 file? An OBML15 file is a webpage saved in the Opera Binary Markup Language (OBML) format. OBML15 files are created by and can be opened in the Opera Mini web browser.

More Information Opera Mini users can download webpages to view them without access to an Internet connection. Previously, when a user downloaded a webpage, it was saved as an OBML15 file. OBML15 files use the OBML file format, which is a compact format designed to reduce the size (and increase the download speed) of web content. OBML15 files replaced .OBML files with the release of Opera Mini version 5 and were themselves replaced by .OBML16 files in Opera Mini version 7. Opera Mini 7 and later versions do not support and cannot open OBML15 files.