Multiple sequence alignment online
Press "Start". A sample alignment is loaded. Import your own alignment by pressing "import" button on the menu that will appear.
You may also be interested in the following
Multiple alignment tools (MSA) and resources
Related tutorials
Pair-wise sequence alignment
Pair-wise sequence alignment methods
How to select the right substitution matrix?
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References
Guy Yachdav, Sebastian Wilzbach, Benedikt Rauscher, Robert Sheridan, Ian Sillitoe, James Procter, Suzanna E. Lewis, Burkhard Rost, Tatyana Goldberg1 (Jul 2016). "MSAViewer: interactive JavaScript visualization of multiple sequence alignments." Bioinformatics. 2016 Nov 15; 32(22): 3501–3503. PMC
IUPAC-IUB Joint Commission on Biochemical Nomenclature. Nomenclature and Symbolism for Amino Acids and Peptides: Recommendations 1983. FEBS J. 1984, 138 (1), 9–37. DOI: 10.1111/j.1432-1033.1984.tb07877.x. HTML version.