Convert GenBank or Game Boy files (GB) online for free
The .GB file extension serves two entirely unrelated, yet highly specific technical purposes. Primarily, it functions as a GenBank DNA Sequence file. Biologists and geneticists use this format to store annotated DNA or RNA sequences retrieved from the National Center for Biotechnology Information (NCBI). Alternatively, a .GB file can be a Nintendo Game Boy ROM image, which is a digital dump of a physical game cartridge used for classic hardware emulation.
The main disadvantage of the GenBank .GB format is its highly rigid, legacy flat-file structure. It relies on strict column positioning that is notoriously difficult to parse without specialized bioinformatics software like Vector NTI or Python libraries. For Game Boy ROMs, the raw files are entirely useless on modern hardware without third-party emulators like BGB. ROM files also often require external patching and zip-compression for efficient storage and legal backup management.
To make these files practically usable, format conversion is necessary. For bioinformatics workflows, convert .GB to FASTA to perform pure sequence alignments, or to GFF to extract genomic feature annotations. For archiving or sharing sequence data plainly, convert to standard TXT. For Game Boy files, compress them to ZIP or 7Z for bulk archiving. Drop your file here to view and convert it securely right in your browser.
Use Convert.Guru to open and convert your GB file.
Users also converted GENBANK, GBC, GBA, ROM, TGB, ZIP, FASTA, PDF, MP4, NDS, CIA, GP and G3A files.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our GB converter.