Convert single letter amino acid codes to three letter codes
Paste the raw sequence or one or more FASTA sequences. Input limit is 100,000,000 characters.
Paste your protein sequences in FASTA format or as raw sequences. The tool accepts single-letter amino acid codes (A, C, D, E, etc.).
Click the execute button to convert all single-letter amino acid codes to their three-letter equivalents (e.g., A → Ala, C → Cys).
The converted sequences are formatted with proper capitalization (first letter uppercase, rest lowercase) and line breaks every 60 characters.
Use the download button to save the results as a text file, or copy the output for use in publications or presentations.
Convert sequences to three-letter codes for formal publications and scientific documentation.
Improve readability of protein sequences in presentations and educational materials.
Prepare sequences for structural analysis tools that require three-letter amino acid codes.
Format sequences for databases or applications that specifically require three-letter notation.