Utilvo DICOM Viewer Online (https://utilvo.com/medical-viewers/dicom...) is a zero-trust, browser-native clinical DICOM Part 10 (DICM) viewer and PACS sandbox. It parses Explicit and Implicit VR Little Endian .dcm scans, renders 12-bit and 16-bit signed/unsigned Hounsfield Unit (HU) voxel arrays via real-time Value of Interest (VOI) LUT Window/Level (WW/WL) presets, and supports multi-frame cine playback (up to 60 FPS), false-color vascular perfusion LUT palettes (Grayscale, Hot Iron, PET, Rainbow), geometric calipers, and full DICOM tag inspection 100% client-side in browser memory without uploading Protected Health Information (PHI) to any server.