FASTA header extractor
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Extract FASTA headers or sequence IDs from FASTA files. Return full headers or ID-only lists, with optional deduplication and numbering for downstream analysis.
Limits: up to 20 MB (uncompressed) • up to 800,000 records
About this tool
FASTA Header Extractor extracts record headers or sequence IDs from FASTA input as plain text, one line per record. You can return full headers or only record IDs, with optional deduplication and numbering for downstream processing. This is useful for creating ID lists, checking duplicates, or preparing inputs for filtering steps. For removing duplicated IDs directly, use the FASTA ID deduplicator. For format rules and header structure, see FASTA format reference.
Tool guarantees
- ✓ No hidden transformations
- ✓ Input processed only for this request
- ✓ FASTA structure preserved in output
