Random DNA Sequence

LengthNumber of sequencesGC content (%)

Output

How to generate random DNA

Set the length, the number of sequences and the GC content.
Click Generate.
Each sequence is a FASTA record. Copy output or Download saves the result.

Frequently asked questions

How random is it?

It uses the browser's cryptographic random number generator. Each base is drawn on its own, so the GC content is close to what you set but varies a little between sequences.

More DNA and protein sequence tools

Reverse Complement DNA to RNA Combine FASTA Sequences Split FASTA Sequence GenBank to FASTA EMBL to FASTA GenBank Feature Extractor EMBL Feature Extractor GenBank Translation Extractor EMBL Translation Extractor Split Codons Range Extractor DNA Range Extractor Protein Window Extractor DNA Window Extractor Protein Filter DNA Filter Protein Group DNA Group Protein One-Letter to Three-Letter Amino Acids Three-Letter to One-Letter Amino Acids DNA Statistics Protein Statistics Codon Usage CpG Island Finder DNA Molecular Weight Protein Molecular Weight Protein Isoelectric Point Protein GRAVY DNA Pattern Find Protein Pattern Find Fuzzy Search DNA Fuzzy Search Protein Identity and Similarity ORF Finder Translate DNA to Protein Reverse Translate Reverse Translate a Protein Alignment PCR Primer Stats PCR Products Restriction Summary Mutate for Digest Pairwise Align DNA Pairwise Align Protein Pairwise Align Codons Restriction Map Translation Map Primer Map Color Alignment by Conservation Color Alignment by Properties Codon Plot Random Protein Sequence Random Coding DNA Random DNA Regions Random Protein Regions Sample DNA Sample Protein Shuffle DNA Shuffle Protein Mutate DNA Mutate Protein Genetic Codes IUPAC Codes