Random DNA Sequence Generator
Produce random A/C/G/T sequences for biology lessons and bioinformatics demos. Free, no signup.
Scan to open on your phone
Point your phone camera at the code to open this tool.
Produce random A/C/G/T sequences for biology lessons and bioinformatics demos. Free, no signup.
How to use Random DNA Sequence Generator
- Open the toolNo signup and nothing to install; it works as soon as the page loads.
- Set “Length (bases)”
- Set “How many”
- Read the resultChange any input and the result is recalculated immediately.
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
Random DNA Sequence Generator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- What do the letters mean?
- A, C, G and T are the four nucleotide bases that make up DNA.
- Is this a real genome?
- No. It is a random sequence meant for illustration and practice.