SF 15 to 18

Salesforce uses case-sensitive 15 char Id's and 18 char case-insensitive Id's, for use in external systems that don't do case-sensitive matches, such as Excel or SQL Server.
This app simply takes 15 char Id's - on their own, or in a list (one per line, or separated by commas or semi-colons) and returns a list of the 18 char versions.
Paste them into the top box then simply click the 18 char text box, and all the Id's will be converted and copied to your clipboard ready for use.