DICOM Viewer | Open DCM Files & Tags Online

DICOM viewer for your browser: open .dcm files or a whole CD folder, scroll CT and MRI series, adjust window/level and read every tag. Nothing is uploaded.

Also known as: dicom viewer online · dcm file viewer · open dcm file · dicom tag viewer · dicom header viewer · view ct scan online · mri viewer online · dicomdir viewer · dicom to png · dicom viewer no upload

image tools

file converters

viewers

DICOM Files

Drop .dcm files, a whole patient CD folder or a .zip here, or click to browse

Files without an extension (IM000001, I10) and DICOMDIR media work too. Everything is read in your browser and nothing is uploaded.

DICOM Viewer

No DICOM files opened yet

Open a .dcm file, a whole patient CD folder or a .zip, or press Load Example for a synthetic CT. The viewer lists every series, scrolls through the slices, lets you adjust the window and level, and shows every tag in the file, including nested sequences and private tags.

A privacy check lists which patient identifiers are still filled in, which helps when you prepare a de-identified export. You can save the current slice as a PNG, the tags as DICOM JSON, or a text report.

About the DICOM Viewer

Use this DICOM viewer to open .dcm files from a patient CD, a PACS export or a test fixture, scroll through CT and MRI series and read every tag without uploading anything. It reads Part 10 files and DICOMDIR media, Implicit and Explicit VR, deflated data, RLE, JPEG Lossless, JPEG-LS and baseline JPEG, and checks a file for leftover patient identifiers. Not for diagnostic use.

Key Features

Open single files, many files, a whole CD folder or a .zip, by click or by dragging folders in
Series list sorted by instance number and slice position, with scroll, window and level, pan, zoom, invert, cine and distance measurement
Searchable tag table with nested sequences, private creators and the Specific Character Set decoded
Privacy check that lists which identifying attributes are filled, plus the Burned In Annotation and de-identification flags
Export the current slice as a PNG with its window, the tags as DICOM JSON (PS3.18) or a dcmdump-style text report
Indexes headers first and decodes one slice at a time, so a 500-slice, 250 MB study stays responsive

Use Cases

Check a CT or MRI disc a patient brought to an appointment before it goes into the PACS
Confirm a de-identified export for a HIPAA Safe Harbor or research data-sharing request has no names, dates or IDs left
Read the exact tags a modality sent while debugging a DICOMweb or HL7 interface engine
Pull one slice out as a PNG for a case report, a slide deck or a bug ticket
Inspect test files for a DICOM parser or an imaging app without installing dcmtk or Weasis

Supported Formats

.dcm

DICOMDIR

.zip

Part 10 and raw datasets

Implicit VR LE

Explicit VR LE and BE

Deflated

RLE Lossless

JPEG Baseline

JPEG Lossless

JPEG-LS

Related Keywords

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Which DICOM files can this viewer show as images?

Uncompressed, deflated, RLE Lossless, 8-bit JPEG Baseline, JPEG Lossless and JPEG-LS pixel data render as images. JPEG 2000, HTJ2K, 12-bit JPEG and video transfer syntaxes show their tags with a notice instead, because browsers cannot decode them. Reports, structured reports and RT objects have no image, so you get the tags. The window, level and measurements are for inspection only; this is not a diagnostic or FDA-cleared viewer.

Scans stay on your computer

DICOM files hold patient names, IDs and dates. This viewer reads them in your browser, never sends them to a server and never stores the images. Only the text report is saved locally if auto-save is on, so clear the tool before you walk away from a shared computer.

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Frequently asked questions

What is DICOM Viewer used for?

DICOM viewer for your browser: open .dcm files or a whole CD folder, scroll CT and MRI series, adjust window/level and read every tag. Nothing is uploaded.

Is DICOM Viewer free to use?

Yes. DICOM Viewer is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use DICOM Viewer?

No. DICOM Viewer works immediately in your browser with no signup, login, or email address required.

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