Opening FAA Files

The FAA file type is primarily associated with BLAST.

FAA	File extension: FAA
	File type:	protein sequence file

What is a FAA file

FAA files mostly belong to BLAST. Overview: FAA files are used to store protein sequence data in the well‐known FASTA format.
These files hold a list of protein sequences where each entry has a header line (usually starting with '>') followed by lines of amino acid codes.
They are used mainly with bioinformatics tools such as BLAST and other sequence analysis software.
Key Points compiled by FilExt.com:

Protein Sequence Data: Contains amino acid sequences in plain text using a standardized FASTA format.

Usage in Analysis: Employed by software like BLAST and GeneMarkS rRNA Predictor for sequence comparison and gene prediction.

Can be opened in any basic text editor, though analysis benefits from dedicated tools.

FilExt.com tip: FASTA format is simple but remains a cornerstone in bioinformatics research. This format provides easy integration into computational pipelines and can be converted or processed further with many established programs.

How to open a FAA file

You need a suitable software like BLAST to open a FAA file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your FAA file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a FAA file directly in the browser:. Just drag the file onto this browser window and drop it.

Online FAA Text Viewer

Choose your .faa file to view

or drag and drop it here

Online File Viewer

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How to extract texts from FAA files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

If you want to extract texts from FAA file or capture a screenshot, you can use our free Online FAA File Viewer:

To do this, click the button "Choose your .faa file to view" on this page.
Your FAA file will then be displayed in the browser.
Now click on "Save as..." at the top of the page.
Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
Your file will be converted and downloaded.

Programs that open and convert FAA files:

BLAST
See the previous paragraphs to learn more about the main application. FAA files are often referred to as BLAST data files because this type of file is primarily created or used by this software.
BLAST
Files with the *.FAA extension commonly store protein sequence data in the FASTA format. The FASTA format is a text-based format for representing either nucleotide sequences or peptide sequences, in which base pairs or amino acids are represented using single-letter codes. Sequences in FASTA format often begin with a single-line description, followed by lines of sequence data. The description line starts with a greater-than (``>``) symbol. The sequence then follows on the next line, usually wrapping at 80 characters. *.FAA files specifically contain amino acid sequences, distinguishing them from *.FNA files which contain nucleotide sequences. While other sequence formats exist, the FASTA format remains widely used due to its simplicity and readability by both humans and machines. This makes *.FAA files highly portable and readily usable in various bioinformatics tools and pipelines. This file format is classified as bioinformatics.

FAA file format:

A file format defines how the data in the file is structured. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. So a detailed analysis of a file is vital in order to determine the format and the associated program. Our examination of the FAA files comes to the following conclusion:

The FAA file extension includes various formats for various programs. The following file formats are most commonly found in FAA files:

35% of all FAA files have the same signature >NP_. These files are text files, so they contain words and text. Most of these files are 210 bytes to 30 KB in size. The file type is a fairly new file format. Several words can almost always be found in the files, e.g. GeneID, [organism=Homo sapiens] and isoform. An example of a file name is protein.faa. These files can be linked to grch.
8% of all FAA files start with the bytes >XP_0, which are crucial for this file format. These files are text files and can therefore be read using a text editor. The files are often between 370 bytes and 19 MB in size. The keywords GeneID, organism and protein are typical for these files. A common filename is protein.faa.

All other FAA files (57%) have no consistent format, often e.g. fig. Files like these are sometimes linked to prodigal, gene, translated, proteins, gvmeta, catalogue, assembly, organism, contigs, secret or lotus. If you want to find out which format your FAA file belongs to, just click on the button "Choose your .faa file to view".

Technical Data for FAA File Extension

File classification:

Data

Related files:

fasta, fa, fna, fas, ffn, jsonl, fsa, tsv, gff, gz, gbk, out, zip, json

Mime type:

text/x-fasta

a faa protein sequence file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with FAA files

Associate the FAA file extension with the correct application.
Update your software that should actually open protein sequence files. Because only the current version supports the latest FAA file format. Search, therefore, e.g. on the manufacturer website after an available BLAST update.
To make sure that your FAA file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .FAA file online - secure, fast, and no downloads needed.