DICOM Viewer Online

No. The page reads the files inside this tab, and the DICOM reader of the DICOM Viewer extension parses them in a background worker that has no network functions. The page CSP sets connect-src to none. Open the Network tab of your browser tools and you will see no request when the images open. That matters for scans with patient names in them.

Click Choose a folder and pick the folder with the slices, or select all slice files at once. The slices are sorted by their position, and a folder with several series gives a list to switch between them. Files that are not images (such as DICOMDIR, text or pictures) are skipped.

Yes. Drag on the image to change them, or pick a preset (CT brain, soft tissue, lung, bone); Shift-drag pans and double-click resets the view. The axial, coronal and sagittal views come from the same volume, and the mouse wheel moves through the slices.

Yes. The Tags panel lists every tag of the current slice with its name, VR and value, with search. Copy puts them on the clipboard as text.

DICOM files with or without the 128 byte preamble, little and big endian, multi-frame, RLE and deflate compressed, and NIfTI 1 and 2 (.nii and .nii.gz), up to 1 GB. JPEG and JPEG 2000 compressed DICOM is named in a clear message.

No. The page is a free viewer for looking at images and checking files, not a certified medical device. Use your clinic's approved viewer for any medical decision.

Viewing, series, window and level, the three views, tags and PNG export of a slice are free here and in the VS Code extension. Converting a DICOM series to NIfTI and exporting DICOM tags to CSV are Zovo Pro in the extension. One USD 19 payment covers the Pro tools in every Zovo extension.