When making new names there is a chance of two files ending up with the same name. The default behavior is to fail and not rename the file but you can change this behavior by applying a different name collison rule. The 4 rules are described below.

Fail

Don't let Advanced Renamer rename files with a name collision. This is the default behavior.

Append incrementing number

Will append a incrementing number grouped by similar filenames. If the resulting new names are as follows:

Foo.txt
Foo.txt
Bar.txt
Bar.txt
Bar.txt

The resulting names will be:

Foo.txt
Foo_001.txt
Bar.txt
Bar_001.txt
Bar_002.txt

Append image sub second

Will append the Exif value Image Sub Second (if present) to files with the same name.

Append pattern

When using this collison rule a text box will allow you to supply a pattern containing tags that should be applied to the end of all files with a collision.