.DICOM File Extension Reference
The .DICOM file format is a structured digital document and data container standardized for cross-platform exchange and application interoperability. Files with the .DICOM extension are categorized under Medical & Science and are widely utilized in modern computing environments for storing, rendering, and exchanging structured data. By verifying the header signature (50 4B 03 04) using forensic byte inspection tools, users can authenticate file integrity and rule out disguised executable payloads.
Quick Specification & Metadata
.DICOM
Medical & Science
application/dicom
NEMA
N/A
Proprietary / Patent Licensed
Binary Header Data
100 KB - 20 MB
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What is a .DICOM File? (Technical Definition & Architecture)
The .DICOM file format is a structured digital document and data container standardized for cross-platform exchange and application interoperability. Files with the .DICOM extension are categorized under Medical & Science and are widely utilized in modern computing environments for storing, rendering, and exchanging structured data. By verifying the header signature (50 4B 03 04) using forensic byte inspection tools, users can authenticate file integrity and rule out disguised executable payloads.
Formatted byte alignment adhering to international format specifications.
Adheres to formal schema and protocol documentation.
Parsed and executed identically across Windows, macOS, and Linux kernels.
DICOM Binary Structure & Header Specifications
The .DICOM format organizes data into validated sequential or hierarchical byte structures. Inspecting the header offset reveals the magic byte sequence 50 4B 03 04.
- File Signature (Magic Bytes): 50 4B 03 04
- MIME Content-Type: application/dicom
- Payload Structure: Optimized data stream with metadata headers and checksum records.
- Safety Classification: Low Risk – Contains 16-bit medical pixel data and metadata headers Files ending in .DICOM should always be inspected for valid magic bytes to verify they match legitimate Medical & Science specifications.
How to Open .DICOM Files on Windows, Mac & Android
- 1Primary Application: Double-click or open directly with RadiAnt DICOM Viewer.
- 2Alternative Software: Open using Horos.
- 3File Association: Right-click the file, select Open with > Choose another app, and check Always use this app.
- 1Native macOS Application: Open with RadiAnt DICOM Viewer.
- 2Quick Look Preview: Highlight the file in Finder and tap the Spacebar.
- 3Set Default App: Press Cmd + I, expand Open with, select your application, and click Change All.
- 1Compatible Mobile Apps: Download a dedicated viewer for .dicom from the Google Play Store.
- 2Cloud Storage: Open through Google Drive, Dropbox, or OneDrive mobile apps.
- 3Online Browser Conversion: Use AnyFileX mobile browser tools to convert the file into universal PDF or image formats.
Convert .DICOM Files Online & Free
Convert your .DICOM files directly into standardized .PDF format with high precision and zero privacy compromises.
Export .DICOM files to .JPG for universal cross-platform viewing, printing, and sharing.
.DICOM MIME Types & HTTP Server Headers
When serving .dicom files over HTTP or configuring REST APIs, web servers must send the official IANA registered Content-Type headers:
| MIME Type Identifier | Standard Usage | File Extensions | Copy |
|---|---|---|---|
| application/dicom | Standard official MIME type for .dicom files | .dicom |
# Nginx mime.types
types {
application/dicom dicom;
}
# Apache .htaccess
AddType application/dicom .dicom.DICOM Magic Bytes & Hex File Signatures
In digital forensics and file signature analysis, authentic .dicom files begin with a standardized magic byte sequence at byte offset 0x00 to verify file integrity and prevent extension spoofing:
Offset 0x0050 4B 03 04DICOMMedical & Science File Format.DICOM vs .PDF (Detailed Format Comparison)
| Feature Metric | .DICOM | Advantage | |
|---|---|---|---|
| Format Full Name | DICOM File Format | Portable Document Format | Tie / Equal |
| Category | Medical & Science | Documents | Tie / Equal |
| MIME Content-Type | application/dicom | application/pdf | Tie / Equal |
| Binary Header (Magic Bytes) | 50 4B 03 04 | 25 50 44 46 2D (%PDF-) | Tie / Equal |
| Typical Storage Footprint | 100 KB - 20 MB | 200 KB – 25 MB | Tie / Equal |
| Universal Native Support | High / OS Standard | High / OS Standard | Tie / Equal |
.DICOM Compatibility Matrix
Supported natively or through RadiAnt DICOM Viewer
Supported natively or via Horos
Supported via open-source tools and command line utilities
Accessible through compatible mobile viewers or cloud previewers
Supported through dedicated mobile apps or cloud viewers
Accessible via web browser applications and Chrome extensions
Recommended Software for .DICOM
RadiAnt DICOM Viewer
Medixant
Horos
Horos Project / Purview
MicroDicom
Simeon Stoykov
Common Errors & Troubleshooting .DICOM Files
Security & Malware Risk Assessment
Can a .DICOM file carry viruses or malware?
Contains 16-bit medical pixel data and metadata headers Files ending in .DICOM should always be inspected for valid magic bytes to verify they match legitimate Medical & Science specifications.
No active macro execution support
Safe to inspect with AnyFileX's browser sandbox
- •Verify file extension in OS File Explorer options ('Show known file extensions').
- •Verify magic bytes (50 4B 03 04) to ensure the file isn't a renamed executable.
- •Do not open .DICOM attachments received unexpectedly via email or instant messenger.
Preguntas frecuentes
Respuestas claras a las preguntas más habituales.
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