Sequence utilities / Sequence extraction
Your data stays in your browser: files are read and processed on your device, never uploaded to any server, and cleared when you close the page. Free, no sign-in.
“ID list” picks sequences from the file; “Coordinates” cuts sub-regions; the two can be combined (pick, then cut).
Coordinates are 1-based and inclusive, as in genome browsers and GFF. BED files are 0-based and half-open: add 1 to the start before use.
Regions marked (-) are returned as the reverse complement (IUPAC rules); the result ID becomes “ID:start-end(-)”.
IDs not found and out-of-range coordinates are listed in the yellow notes. Copy or download the result as FASTA; the list table records the source and coordinates of each output.
Coordinates: 1-based closed intervals (GFF3 specification, Sequence Ontology); reverse complement uses the IUPAC-IUB nucleotide codes (Cornish-Bowden 1985).
Runs in your browser; up to roughly 100 MB of sequence is recommended.
Send us your data and research question and you will receive a written plan within 1 working day: analysis steps, parameter rationale, deliverables and timeline. Quoted per project.