Protein FASTA Validator
Check a batch of protein FASTA records before using them in sequence tools. The validator lists each record's header line and sequence length, then flags structural and alphabet issues at their input coordinates. Once the batch passes validation, format a separate copy for reuse.
Results
Validate FASTA to see each record and its sequence length.
How protein FASTA is validated
Each record starts with a header at column 1 and must contain at least one sequence symbol. The validator accepts uppercase and lowercase forms of the 20 standard amino acids. Whitespace is ignored in sequence lines. Invalid symbols still count toward the displayed length and are tallied separately.
Read the calculation method →Worked example
>alpha example
ac D
>beta
WY
This input contains two valid records. The alpha sequence has length 3 and beta has length 2.
Limitations
- The accepted alphabet is specific to ResidueBench. Ambiguous residues, rare amino acid codes, gaps, and stop markers are flagged.
- Formatting requires every record to pass validation. It preserves headers, order, and all residue letters, wraps at 60 residues, and changes letter case only when requested.