Three-Letter to One-Letter Amino Acids

Protein in three-letter codes

Line length

Output

How to convert three-letter to one-letter amino acid codes

Paste a protein written in three-letter codes, such as Met-Lys-Val or MetLysVal.
Spaces, hyphens, numbers and line breaks are ignored, and any letter case works.
The one-letter sequence appears below. Copy output or Download saves the result.

Frequently asked questions

What if a code is not recognised?

The tool stops and names the first group of three letters that is not an amino acid code, so you can fix it.

Is my sequence uploaded?

No. Everything runs in your browser, so your sequences never leave your device.

More DNA and protein sequence tools

Reverse Complement DNA to RNA Combine FASTA Sequences Split FASTA Sequence GenBank to FASTA EMBL to FASTA GenBank Feature Extractor EMBL Feature Extractor GenBank Translation Extractor EMBL Translation Extractor Split Codons Range Extractor DNA Range Extractor Protein Window Extractor DNA Window Extractor Protein Filter DNA Filter Protein Group DNA Group Protein One-Letter to Three-Letter Amino Acids DNA Statistics Protein Statistics Codon Usage CpG Island Finder DNA Molecular Weight Protein Molecular Weight Protein Isoelectric Point Protein GRAVY DNA Pattern Find Protein Pattern Find Fuzzy Search DNA Fuzzy Search Protein Identity and Similarity ORF Finder Translate DNA to Protein Reverse Translate Reverse Translate a Protein Alignment PCR Primer Stats PCR Products Restriction Summary Mutate for Digest Pairwise Align DNA Pairwise Align Protein Pairwise Align Codons Restriction Map Translation Map Primer Map Color Alignment by Conservation Color Alignment by Properties Codon Plot Random DNA Sequence Random Protein Sequence Random Coding DNA Random DNA Regions Random Protein Regions Sample DNA Sample Protein Shuffle DNA Shuffle Protein Mutate DNA Mutate Protein Genetic Codes IUPAC Codes