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Batch MASST Search

Drop an .mzML or .mgf file and search every MS/MS spectrum against all public metabolomics data with fastMASST. Spectra are read in your browser (nothing is uploaded), each is searched on the GNPS server, and the hits are compiled into one table you can download.

Input file

Drop an .mzML or .mgf here

or click to choose · spectra are extracted locally, in your browser

Search

Search against

Search parameters

Analog search (allow a precursor-mass delta)

Cosine threshold

Precursor tol (Da)

Fragment tol (Da)

Min peaks / spectrum

Parallel searches

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Summary

By dataset

Dataset	Matches

Matches

Query scan	Query m/z	Cosine	Peaks	Δ mass	Dataset	Compound	Spectrum

Each spectrum is searched independently on api.fasst.gnps2.org; there is no batch endpoint, so a big file means many searches on a shared public server — please be considerate. A hit means a public spectrum looks similar to one of your spectra, not a confirmed identification; verify with the mirror plot. Compound names come only from library hits. This page needs cross-origin access enabled on the API for apps.gnps2.org, else the searches fail with a network error.