Protein Structure Viewer Compare, annotate, and publish predicted and experimental structures — entirely in your browser
Add structures or AlphaFold result ZIPs Drop files anywhere on this page, or choose PDB, CIF/mmCIF, JSON, CSV, and ZIP files Multiple ZIPsLocal processingNo upload
Fetching contacts files.rcsb.org or alphafold.ebi.ac.uk. Files you open locally are never sent anywhere.
No structure loaded yetDrop a PDB, CIF, or AlphaFold ZIP anywhere on this page, or fetch an ID above
0 structures Mean pLDDT — Ready
Load one or more structures to begin.

Help and keyboard shortcuts

Getting structures in

  • Drop .pdb, .cif, .mmcif, or whole AlphaFold result .zip archives anywhere on the page.
  • Add AlphaFold *_confidences.json, *_summary_confidences.json, ranking_debug.json, or ranking_scores.csv to attach pTM, ipTM, ranking scores, and PAE to matching models.
  • Type an identifier to fetch it: a four-character PDB ID (1ubq), a UniProt accession (P69905), or an AlphaFold DB name (AF-P0DTC2-F1).

In the 3D view

  • Drag to rotate, scroll to zoom, right-drag or two-finger drag to pan.
  • Click any atom to inspect its residue, chain, and pLDDT, and to place a label.

Keyboard

← →Previous / next model
CStart or pause automatic cycling
FFit the view to what is displayed
Shift + FToggle full screen
1 – 6Jump to a tool tab
?Open this help
EscClose help, leave full screen, stop measuring

Reading the numbers

  • pLDDT is per-residue local confidence. High pLDDT does not mean the relative placement of chains is right.
  • PAE and ipTM are what to read for interfaces and domain placement in complexes.
  • RMSD from the Compare tab is a visual-comparison aid. Always report the alignment method, chain mapping, and aligned Cα count alongside it.

Everything runs locally. Structure files you open are read in the browser and are never uploaded.