Convert DB to ABS

Both the DB and ABS file extension were in the past or perhaps still are used by some programs for database file, which means it might be possible, however unlikely, that some are compatible for some kind of db to abs conversion. In case you were looking for technical conversion of power supply dealing with decibels (dB) to absolute number (ABS), you have to look for a website specialized in this field. 

Simply put, it is impossible to convert DB to ABS directly.
Thus, there is no so-called db to abs converter or a free online .db to .abs converter to be found.