Free & open – no install required

View your
medical images
in the browser

A clean, fast DICOM viewer that runs entirely in your browser. No server. No account. Your files never leave your device.

Open Viewer See features
DICOM Free Viewer
WC 1024  |  WW 2048  |  Zoom 96%
1_1_PP
2_1_PP
3_1_PP
RÖNTGEN, WILHELM
ID: X-1895
2025-10-06
WÜRZBURG UNIV.
CR #1
2867 × 2314
MDGC
WC: 1024   WW: 2048
Zoom: 96%
1 / 3 images Drag to pan · Scroll to zoom · ← → navigate ⚠ Not for clinical use – not for diagnosis
Features

View DICOM files free –
no software needed

Built for personal use. No login, no upload, no cloud – everything runs locally in your browser.

Drag & Drop
Drop any DICOM file directly onto the viewer. Files without the .dcm extension work too – common on USB drives from radiology equipment.
Thumbnail Panel
A scrollable left panel shows all loaded images at a glance. Click any thumbnail to jump directly to that image.
Window / Level
Separate WC (center) and WW (width) sliders give precise control over brightness and contrast. Auto-populated from the DICOM tags on load.
Zoom & Pan
Scroll the mouse wheel to zoom in and out. Click and drag to pan. A zoom slider is also available in the toolbar for precise control.
DICOM Overlays
Patient name, study date, institution, modality, image dimensions, and current window values are shown as non-destructive overlays directly on the image.
Invert Toggle
Switch between MONOCHROME1 and MONOCHROME2 display with one click. MONOCHROME1 images (white bones on black) are inverted automatically on load.
Keyboard Navigation
Navigate images with ← →, reset the view with R, and toggle invert with I – all without touching the mouse.
Privacy First
Your DICOM files are parsed entirely in the browser using JavaScript. Nothing is uploaded. No server ever sees your medical data.
Works offline – add to your home screen After the first visit everything is cached locally. On Chrome / Edge click the install icon in the address bar. On Safari tap Share → Add to Dock. Opens instantly, no internet needed.
How it works

Open any DICOM file
in three steps

1
Drop your files
Drag DICOM files from your USB drive or file system onto the viewer. No extension required — files named like 1_1_PP open just fine.
2
Adjust the view
Window and level values are set automatically from the DICOM tags. Fine-tune brightness, contrast, and zoom with the toolbar sliders.
3
Navigate freely
Use the thumbnail panel or arrow keys to move between images. Everything stays in your browser — nothing is ever sent to a server.
Support the author

Built for free,
kept alive by you

This viewer is free and will stay free. If it saved you a trip to a Windows machine, consider buying me a coffee.

Coffee
$5
A one-time thank-you
Lunch
$15
Keeps the lights on for a month
Popular
Dinner
$50
Serious support – deeply appreciated

The viewer is a side project maintained in spare time. Your support helps cover hosting, domain, and the occasional late-night debugging session.

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FAQ

Common questions

No. All processing happens entirely in your browser using JavaScript. Your DICOM files are never sent to any server. They do not leave your device under any circumstances.
Standard uncompressed DICOM files — Explicit VR Little Endian. Common with X-ray (CR), CT scout views, and syngo-formatted USB drives from Siemens equipment. JPEG and JPEG2000 compressed pixel data are not yet supported.
Radiology equipment — especially Siemens scanners — writes DICOM files to USB drives without a file extension. Names like 1_1_PP or IM-0001-0001 are standard. The viewer detects the DICOM format from the file header, not the extension.
Yes — after the first visit the viewer is cached as a PWA and works fully offline. Install it to your home screen or dock for instant access without a browser tab.
Yes. The viewer runs in any modern browser including Safari on iOS and Chrome on Android. File access from USB drives depends on the device — on desktop browsers this works seamlessly.
No. This tool is for personal use only — to view your own scans. It has not been tested or certified for clinical use and is not approved as a medical device. Always consult a qualified healthcare professional for interpretation of medical images.