This article explains what an FNA file is, how to open it, and how to save it in other formats such as FASTA, GB, VCF, images, etc.

A file with the FNA file extension is a DNA and protein sequence alignment file in FASTA format that stores DNA information that can be used by molecular biology software.

FNA files can be used specifically to contain only nucleic acid information, while other FASTA formats contain other DNA-related information, such as files with the file extension FASTA, FAS, FA, FFN, FAA, FRN, MPFA, SEQ, NET, or AA.

These text-based FASTA formats originally evolved from a software package of the same name, but are now used as a standard in DNA and protein sequence alignment applications.