DICOM to PNG converter
Convert DICOM to PNG online for free. Lossless PNG export from .dcm medical images, straight in your browser. Nothing is uploaded.
What it does
PNG is the right choice when you do not want the conversion itself to add artefacts. It is lossless, so the greyscale steps you see on screen are exactly what lands in the file — no blocking around sharp edges, no smearing of fine detail.
That makes it the better format for presentations, figures and anything that will be cropped, annotated or scaled afterwards. Files are larger than JPG, which is the trade you are making.
Lossless output
No compression artefacts introduced by the export itself.
Clean edges
Better than JPG wherever there is high contrast, such as bone against soft tissue.
Batch export
Convert every loaded image and download them together as a ZIP.
Pixels only
No DICOM metadata is written into the PNG.
How to use it
Load your files
Individual images or a zipped study.
Select PNG
It is already selected on this page.
Choose the scope
One image or all of them.
Download
A PNG, or a ZIP for multiple images.
When people use it
Figures for a paper or a talk
Lossless images that survive cropping and scaling without degrading.
Annotating a scan afterwards
Arrows and labels stay crisp on a PNG.
Archiving a readable copy
When you want the closest thing to the on-screen image.
Supported files
- Uncompressed DICOM (implicit and explicit VR, little and big endian)
- RLE lossless compression
- JPEG baseline and extended, decoded by your browser
- Files with a .dcm extension, and DICOM files with no extension at all
- ZIP archives containing a whole study or several series
Limitations
- Lossless refers to the conversion, not the source: the 8-bit window applied on screen is still what gets saved.
- JPEG Lossless, JPEG-LS, JPEG 2000 and deflated transfer syntaxes are not decoded — they need heavy codecs we deliberately do not ship. You will get a clear message instead of a blank screen.
- This is a technical tool. It does not read your scan, does not look for findings and does not produce any diagnosis.
- Very large studies of several hundred megabytes may be slow, because all the work happens on your own machine.
Privacy and security
Processed in your browser — nothing is uploaded
Your files never leave your device. Everything runs inside your browser using JavaScript — there is no upload, no server copy and no queue.
Because nothing is uploaded, there is nothing for us to store or delete. Closing the tab removes the files from memory.
We never put file names, patient identifiers or metadata values into analytics or logs. Product events only count how many files were opened.
If you later choose the paid AI explanation, that is a separate, explicit step: you decide which files to attach and nothing is sent until you confirm.
Frequently asked questions
Is PNG better than JPG for medical images?
For anything that will be edited, annotated or scaled, yes — it adds no compression artefacts. For emailing a single picture, JPG is smaller and perfectly adequate.
Why is my PNG so much bigger than the JPG?
PNG stores every pixel exactly. Medical images have a lot of subtle gradients, which compress poorly without loss.
Does the PNG keep the patient name?
No. The file is generated from the rendered pixels, so no DICOM metadata travels with it. Text printed inside the image does remain.
Can I convert several series at once?
Yes. Load them all and export everything; the results arrive in a single ZIP.