Browser viewer, installed viewer, or a viewer on an SSD?
Search for a DICOM viewer with "no install" and you get browser-based tools. They are genuinely useful, and they are the wrong answer for a surprising number of hospital situations: no internet on the ward PC, a two-gigabyte cath-lab study, or a compliance officer who will not allow uploads. This page lays out the three approaches so you can pick by your actual constraints.
By the Hirovix product team · Published 4 Oct 2026 · Facts checked against the sources listed at the end
The three approaches
- Browser (zero-footprint) viewers: you upload the study to the vendor’s servers, or your PACS serves it, and view in a web page. Nothing to install on the PC.
- Installed desktop viewers: RadiAnt, MicroDicom and others. Full performance on the local machine, but someone with rights must install them on each PC.
- Viewer on removable media: Weasis portable on a USB stick, or a complete system on an SSD such as PortaDICOM or SoftDicom. Nothing installed, nothing uploaded, runs where you plug it in.
Decision table
| Constraint | Browser viewer | Installed viewer | Viewer on an SSD |
|---|---|---|---|
| PC has no internet | Does not work | Works | Works |
| You have no admin rights | Works | Does not work until IT installs it | Works |
| Study is multi-gigabyte (cath-lab cine, thin-slice CT) | Slow upload and slow scrolling on hospital links | Fast | Fast; reads from the drive |
| Patient data must not leave the building | Needs a vendor contract and a compliance review of the upload | Stays local | Stays local; nothing uploaded |
| Same tool on many PCs you do not control | Yes, if each has internet | No | Yes |
| Your case history travels with you | Only what you uploaded, on their servers | No | Yes, on the drive |
| Typical cost model | Monthly subscription (PostDICOM lists €79 to €499/month) | Per-PC licence (RadiAnt €39/year, MicroDicom $99) | Per-drive licence (SoftDicom lists $799 to $999; PortaDICOM: contact us) |
| Cardiology QCA measurements | Rare | Rare in general viewers | PortaDICOM: yes, review-grade |
PortaDICOM is for review and records only; measurements are operator-confirmed estimates, not a primary diagnostic read.
When a browser viewer is right
Sharing a study with a referring doctor who has a normal internet connection and permission to view it; a teleradiology workflow where upload is already part of the process; a small practice whose PACS has a web front end. In those cases a browser viewer removes friction and we would not argue against it.
When an SSD viewer is right
A clinician who moves between hospitals and PCs they do not control; a cath lab whose exports are large cine runs; any ward or OPD computer without internet; any institution whose policy forbids uploading identifiable studies to a third party. PortaDICOM adds to that the calibrated cardiology toolset and a 2 TB searchable library of your cases, licensed to the drive.
Can I have both?
Yes, and it is common: a browser viewer for sharing with people outside the building, an SSD viewer for your own review wherever you are. What rarely works is relying on a browser viewer as the only tool on a hospital network.
FAQ
Are browser DICOM viewers safe for patient data?
They can be, with a proper contract, encryption and a compliance review of where the data is stored. The point is that it is a review you must do; a viewer that never uploads anything removes the question.
Why is a browser viewer slow with my CT or angiogram?
The study has to travel up the hospital’s internet link before you see it, and large studies are then streamed back slice by slice. A local viewer reads from the drive.
What is the difference between a USB portable viewer and an SSD viewer?
A portable viewer on a USB stick is the program alone. An SSD viewer such as PortaDICOM is the program plus a 2 TB case library, a licence locked to the device, cine codecs and cardiology tools, on fast storage.
Related guides and comparisons
- ComparisonPortable RadiAnt, or RadiAnt without admin rights: what actually works
- ComparisonRadiAnt DICOM Viewer alternatives for Windows
- ComparisonMicroDicom alternatives
- ComparisonHoros for Windows: there is no PC version, so what do you use?
- ComparisonWeasis vs PortaDICOM
- GuideHow to open a DICOM CD on a Windows PC
Sources
Third-party facts on this page were checked on the date shown at the top. Vendors change prices and features; verify before you buy.
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