Convert ISBNs between 10 and 13 digit formats using this tool. It is only valid until the time when prefixes other than 978 will be used.Is anyone considering converting all their 10 digit ISBNs to 13? Without the identifying ISBN prefix they would have to go into field 024 rather than 020. Still is seems that a rather simple script could be written to read 020a perform the operation to get the 13 digit number and then add field 024 and drop the result in there. Would any access be gained? Well if someone was searching for the EAN, it could help them. How many patrons search on EAN?