Combine FASTA Sequences

Sequences

TitleSpacer between sequencesLine length

Output

How to combine FASTA sequences

Paste several FASTA records.
Optionally type a title for the new record and a spacer, such as NNNNN, to put between the sequences.
The records are joined in the order they appear. Copy output or Download saves the result.

Frequently asked questions

Is my sequence uploaded?

No. Everything runs in your browser, so your sequences never leave your device.

What is the spacer for?

It keeps the original sequences apart inside the joined record. A run of N, for example, stops a later search or alignment from treating the junction as real sequence.

What is a FASTA record?

A title line that starts with the > sign, followed by the sequence on one or more lines. Several records can follow one another in the same text or file.

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