Random DNA generator

Generate random DNA sequences with specified length and GC content. Create single or multiple sequences for testing, simulations, and bioinformatics research.

Generator settings

Size (base pairs)

1 - 1,000,000 bp

Number of sequences

1 - 1,000 sequences

Base frequency mode

Set custom GC content

GC content

0.0 - 1.0 (50%)

Sequence name prefix

Prefix for FASTA headers (e.g., random_dna_1)

Quick presets

About GC content

GC content affects DNA stability, melting temperature, and secondary structure formation:

• Low GC (20-40%): AT-rich, lower stability, easier denaturation
• Medium GC (40-60%): Balanced properties, typical for many organisms
• High GC (60-80%): GC-rich, higher stability, stronger secondary structures

Generated sequences

FASTA