1. Open your files
Drag in one or more .dcm files, a whole study folder, a .zip archive, or a NIfTI file. Decoding happens on your device.
Free · private · in your browser
Free online DICOM viewer
Open your MRI, CT, X-ray, ultrasound or PET scan straight from a CD or folder, with no upload, no sign-up. Your images are read locally and never leave your device.
100% local: your scan is processed in your browser and never uploaded.
How it works
Three steps from file to finding. Everything happens on your device.
2. View & measure
Scroll slices, adjust contrast, zoom, play cine, and take length, angle and ROI measurements.
3. Get an expert read
Unsure about a finding? Start a case for a second opinion from a board-certified radiologist.
Privacy by design
Your scan never leaves your device
All DICOM parsing and rendering happens locally in your browser. Your files are never uploaded to DocOrbit or any third party, so nothing is stored on a server and nothing is used to train AI models. When you do request a second opinion, your imaging is encrypted in transit and at rest.
No upload
Files open directly in your browser. They never touch our servers.
No account required
Use the viewer freely with no sign-up, login, or email.
Your images stay yours
Nothing you open in the viewer leaves your device, so it is never stored or used to train AI.
Supports every common scan
CT · MRI · X-ray · Ultrasound · PET-CT · Mammography: single files, multi-frame, folders, .zip archives, compressed DICOM (JPEG, JPEG 2000, RLE), and NIfTI (.nii, .nii.gz).
DICOM viewer FAQ
Is the DICOM viewer really free?
Yes. The viewer is completely free with no account, no upload, and no limits. It runs entirely in your browser.
Do you store or upload my files?
No. Your DICOM files are opened and decoded locally in your browser. They are never uploaded to DocOrbit or any third party, and nothing is stored on a server.
Which DICOM files and modalities are supported?
Single or multiple .dcm files, a whole study folder, or a .zip archive of DICOM files, including multi-frame studies, from MRI, CT, X-ray, ultrasound, PET-CT, and mammography. Compressed DICOM (JPEG, JPEG 2000, RLE) is supported, and so are NIfTI volumes (.nii, .nii.gz).
Is there a file size limit?
There is no fixed limit because nothing is uploaded. Your files are processed in your browser, so the practical limit is your device's memory. Typical studies of a few hundred megabytes open smoothly; very large multi-gigabyte studies may take longer or use significant memory. Image decoding runs in background workers so the page stays responsive.
What can I do in the viewer?
Scroll through slices, adjust window/level (brightness and contrast), zoom and pan, play cine loops, take length, angle and ROI measurements, invert, and inspect the full DICOM tag list.
Can I get a professional second opinion on what I see?
Yes. After viewing your scan you can start a case with DocOrbit to have it read by a board-certified, subspecialty-matched radiologist, typically within 24–48 hours.
More free tools
No account, no sign-up. The DICOM tools never upload your images.
DICOM anonymizer
Remove the patient's name, ID and other personal details before you share a scan.
DICOM to NIfTI
Convert a study into .nii.gz volumes for FSL, SPM or 3D Slicer.
DICOM to JPEG
Turn slices into ordinary .jpg images you can share or drop into a document.
DICOM to PDF
Put a whole study into one document you can email, print or upload to a portal.
Report simplifier
Paste your MRI or CT report and read it back in plain language, with the terms explained.
Get a second read
Concerned about a finding?
Get an independent second opinion from a board-certified radiologist, with results in 24–48 hours.
