SeqBench

Fetch Sequence by Accession (NCBI, UniProt)

Paste a GenBank, RefSeq or UniProt accession and get the FASTA or GenBank record.

🌐 Nothing you paste is logged or stored — the accession you enter is looked up live at NCBI or UniProt

Retrieve public DNA or protein records by accession number. Enter a GenBank/RefSeq ID (e.g. NM_000546) or a UniProt accession (e.g. P04637) and SeqBench retrieves the record from NCBI E-utilities or UniProt, shows the header and length, and lets you copy or download it as FASTA or GenBank. Only the public accession you enter is used to fetch the record, and it is never logged or stored.

Examples:

How to use the Sequence Fetcher tool

  1. 1Type or paste an accession (e.g. NM_000546, NP_000537, P04637).
  2. 2Pick the database (or leave it on Auto-detect) and the output format (FASTA or GenBank).
  3. 3Click Fetch, then copy or download the record — or paste it straight into another SeqBench tool.

Frequently asked questions

Which databases and IDs are supported?

NCBI Nucleotide (GenBank/RefSeq IDs such as NM_, NR_, XM_, NC_ and classic accessions), NCBI Protein (NP_, XP_, YP_, WP_…) and UniProtKB accessions (e.g. P04637). Auto-detect picks the right database from the accession format, or you can choose it manually.

Can I download GenBank format, not just FASTA?

Yes. For NCBI records you can fetch either FASTA or the full GenBank/GenPept flat file with its annotations. UniProt is served as FASTA.

Why does this tool talk to NCBI and UniProt?

They are the authoritative sources: GenBank/RefSeq records come from NCBI E-utilities and protein records from UniProt, so you get the current record rather than a stale copy. Only the public accession you enter is used to fetch it, and it is never logged or stored.

More

Guides

References

Sequence file formats

Quick reference for FASTA, FASTQ, GenBank and related formats.

Genomics file formats

SAM/BAM flags, VCF, BED and GFF/GTF columns and coordinate systems.

Cloning & expression vectors

Reference table of common cloning and protein expression vectors with backbone size, origin of replication, copy number, selection marker, promoter and fusion tags.

Related tools

Format Converter

Convert between FASTA, GenBank and tab-separated formats, and extract CDS or protein sequences.

Reverse Complement

Calculate the reverse, complement or reverse complement of a DNA/RNA sequence.

Sequence Formatter

Clean, case-convert, wrap, reverse and convert between DNA and RNA.