Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.FNA
File Type
FASTA Nucleic Acid File
Category
Data
Best first step
Use compatible software
Quick Summary
A practical overview of the .fna file format
The FNA file extension represents a FASTA Nucleic Acid file, which is a specialized text-based format widely utilized in the fields of bioinformatics and molecular biology. It is a specific variation of the broader FASTA format, explicitly designated to store nucleotide sequences, including DNA and…
File extension
.FNA
File type
FASTA Nucleic Acid File
Category
Data
Recommended action
Open with a trusted compatible app
How to open a .fna file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .fna.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .fna file?
File extension details and usage information
The FNA file extension represents a FASTA Nucleic Acid file, which is a specialized text-based format widely utilized in the fields of bioinformatics and molecular biology. It is a specific variation of the broader FASTA format, explicitly designated to store nucleotide sequences, including DNA and RNA data. Each entry within an FNA file begins with a header line, distinguished by a greater-than symbol ('>'), which contains a unique sequence identifier and optional descriptive metadata. Following this header is the actual sequence data, represented by standard single-letter codes such as A, C, G, T, and U, along with 'N' for unknown bases. These files are fundamental for various computational biology tasks, including genome assembly, sequence alignment, phylogenetic analysis, and searching large-scale biological databases like GenBank. Because FNA files are stored in a plain text format, they are highly portable and can be opened with basic text editors; however, specialized bioinformatics software is typically required to analyze the complex genomic information they contain. They serve as a standard medium for researchers to share genetic information across different platforms and software suites, ensuring consistency in global genomic research and comparative studies.
Software Compatibility
Programs that may open or work with .fna files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .fna files be converted?
Options for saving or exporting this file to another format
In many cases, a .fna file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .fna file.
Why can't I open a .fna file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .fna format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .fna files
To open a .fna file, use software that supports this file format.
- Notepad++
- Geneious Prime
- MEGA (Molecular Evolutionary Genetics Analysis)
- BioEdit
- SnapGene
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .fna file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.