You can convert your alignment file from one format to another on this page.
The input format is automatically guessed.
Some formats are difficult to guess*,
so you have to option to provide the format of your input file.
*Guessing takes place first on file exention, then on file contents.
This means a file ending with .aln should be in ClustalW format.
The SELEX format may be guessed as PHYLIP if the file has no file extention (or .txt).
The Alignment Converter web server was developed by Bernd Brandt