Peptide Mass Matcher

Provide masses under Mass List (one per line), or upload a CSV file with a Mass column (for example, exported from MassCalc). Uploaded values are loaded into the text box for review before matching.

Set Tolerance (default 0.5) — the maximum absolute difference allowed between your mass and a database mass.

Choose Mass Type to match against the corresponding database values:

• Average — average oxidised or reduced mass stored for each peptide
• Monoisotopic — monoisotopic oxidised or reduced mass

Click Match Peptides to search peptide sequences in the database. Results list your input mass, the matched database mass, mass type, sequence, sequence name, and description.

If no rows match within tolerance, a message is shown. Use Download CSV to export matches, or Refresh to clear the form.