Open your images
Drop .dcm files, a whole folder (a CD or USB export works) or a ZIP. Images are grouped by patient, study and series.
Free DICOM Viewer Online
View CT, MR, X-ray and ultrasound images in your browser, from single files, whole folders or ZIP archives. Window and level, measure in millimetres and Hounsfield units, reformat volumes, read every tag, and remove patient details before you share.
Open DICOM Viewer →How to view DICOM files online
Look and measure
Scroll through slices, drag to adjust window/level, zoom and pan, and measure lengths, angles and regions. Switch to 2 or 4 viewports or reformat a CT or MR volume.
Share or export safely
Download an anonymized copy with names, IDs and dates removed, or save images as JPG, PNG or an MP4 cine.
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DICOM viewer FAQ
Is this DICOM viewer free?
Yes. Open as many studies as you like, with no account, no watermark and no file limits beyond your device's memory.
Can I use it to diagnose?
No. This viewer is not a medical device and is not for diagnostic use. Use it to look at your own scans, to study, to teach or for research. Clinical reading must be done on certified software and displays.
Are my images uploaded?
No. Files are read and decoded in your browser and never leave your device. Some compressed formats need a decoder that downloads once from a public code library the first time it is used; your images are not sent anywhere.
Which files can it open?
DICOM files with or without the .dcm extension, folders from a CD, DVD or USB export (the DICOMDIR index is skipped and the images are read directly), and ZIP archives. Uncompressed, deflated, RLE, JPEG baseline and 12-bit, JPEG lossless, JPEG-LS, JPEG 2000 and HTJ2K images are supported, including multi-frame and colour images. Video-encoded DICOM (MPEG-2, H.264, HEVC) and JPEG XL are not.
How do I measure Hounsfield units?
Choose the ellipse or rectangle tool and drag over the area. The mean, standard deviation, minimum, maximum and area are shown in Hounsfield units on CT, using the rescale slope and intercept in the file. Lengths and areas use the pixel spacing; when an X-ray only has detector spacing, the viewer says so because magnification is not corrected.
What does anonymize remove?
It follows the DICOM PS3.15 Basic Application Level Confidentiality Profile: names, IDs, dates, institution and device details, free-text descriptions and private tags are removed or emptied, and every UID is replaced consistently across the whole export. You can choose to shift dates by a fixed number of days, keep patient age and sex, or keep series descriptions. Pixel data is copied unchanged.
Does anonymizing remove names written in the image?
No. Text burned into the pixels, common on ultrasound and screen captures, stays. The viewer warns you when a series is likely to have it; check those images before sharing.
Can it show MPR?
Yes. For CT and MR volumes of parallel slices, choose MPR to see axial, coronal and sagittal views side by side with linked crosshairs. Click in any view to move the other two.
What does this viewer not do?
It doesn't do 3D volume rendering, PET/CT fusion, hanging protocols, structured reports, DICOM networking (PACS query or send) or writing to CD. It is for viewing, measuring, anonymizing and exporting.
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