Drop any ENDF-6 file

Parse and plot your own evaluations — private evaluations, hand-modified PENDF, vendor-specific libraries, anything in ENDF-6 format. The parser runs entirely in your browser; your file never leaves your machine.

MF=1 header parsedMF=3 cross sections plottedMF=2 resonance params — use main ViewerMF=33 covariance — not yet

▸ scopeThis is not a JANIS replacement.

The parser only reads MF=1 (header) and MF=3 (point-wise σ tables). It does not reconstruct resonances (MF=2), decode angular distributions (MF=4 / MF=6), outgoing-energy distributions (MF=5 / MF=6), fission-product yields (MF=8), photon production (MF=12 / MF=15), or covariances (MF=33). Best for PENDF / already-reconstructed point cross sections — drop a file and compare it against an evaluation already in the main Viewer.

Open your own ENDF file

drop an .endf file here, or click to choose

parsed entirely in your browser · no upload · MF=1 header + MF=3 cross sections

Drop a file on the left to begin. Try any n-0ZZ_Sym_AAA.endf from ENDF/B-VIII.1, JEFF-3.3, JENDL-5, or your own evaluation.

What gets parsed

MF=1 MT=451 — material metadata: Z, A, MAT number, library ID (NLIB), evaluator lab, evaluation date.
MF=3 — point-wise cross sections for the 9 common reactions (MT = 1, 2, 4, 16, 17, 18, 102, 103, 107). Resonance-reconstructed PENDF files work best; raw resonance-parameter files only expose background xs.

What doesn't (yet)

MF=2 resonance parameters — we have them for the 36 curated isotopes, surfaced in the main Viewer's Resonance panel.
MF=4/6 angular distributions, MF=5 energy distributions, MF=33/34 covariance — roadmap.
No evaluation-format conversion (CINDA/X4, MATXS, GENDF): if you need group-structure conversion, point your file at NJOY2016's groupr module first.

Everything here runs in your browser · no upload · no tracking.