MIME Database / Compare Formats / canon-cr3 vs HEIC

canon-cr3 vs HEIC Format Comparison

canon-cr3

Canon RAW 3

image/x-canon-cr3

High Efficiency Image Container

image/heic

HEIC

A complete technical comparison of Canon RAW 3 and High Efficiency Image Container — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

HEIC wins on browser support

Feature Support

Feature	canon-cr3	HEIC
Transparency (Alpha)	✕ No	Yes
Animation Support	✕ No	Yes
Progressive Loading	✕ No	✕ No
HDR Support	Yes	Yes
EXIF Metadata	Yes	Yes
ICC Color Profile	Yes	Yes

Canon RAW 3

image/x-canon-cr3

Extension

.cr3

Container ISOBMFF (ISO/IEC 14496-12)

Compression Lossless / Lossy (C-RAW)

Algorithm

Canon Proprietary LosslessCanon Proprietary Lossy (C-RAW)

Color Depth 14-bit (Per Channel)

Developed by Canon Inc.

Released 2018

Magic Bytes

00 00 00 18 66 74 79 70 63 72 78 20

Full canon-cr3 reference →

High Efficiency Image Container

image/heic

Extension

.heic

Container HEIF / ISOBMFF

Compression Lossy / Lossless

Algorithm

HEVC (H.265)

Color Depth 8-bit, 10-bit, 12-bit, 16-bit

Developed by MPEG (Standard) / Apple (Adoption)

Released 2017

Magic Bytes

XX XX XX XX 66 74 79 70 68 65 69 63

Full HEIC reference →

Browser Support Comparison

Browser	canon-cr3	HEIC
Chrome	✕	✕
Firefox	✕	✕
Safari	✕	✓ 11+
Edge	✕	✕
IE (Legacy)	✕	✕

canon-cr3

canon-cr3 Strengths

Maintains 14-bit uncompressed sensor data, offering massive flexibility for recovering shadows and highlights in post-production
The new C-RAW format offers roughly 40% smaller file sizes than uncompressed raw with virtually indistinguishable quality loss
Utilizes the modern and extensible ISOBMFF container, moving away from archaic TIFF limitations

Limitations

Being a proprietary format, it requires frequent software updates to third-party editing tools (like Lightroom or Capture One) every time a new camera model is released
Completely unsupported in web browsers and standard operating system image viewers without specialized raw codecs
Larger file sizes than in-camera JPEGs, requiring more storage space and processing power

HEIC

HEIC Strengths

Exceptional compression efficiency — stores images at roughly half the file size of JPEG with equal or better visual quality
Natively supports modern photography features like depth maps, 16-bit color, HDR, and alpha channel transparency
Can store image bursts, focal stacks, and animations (Live Photos) within a single file

Limitations

Heavily encumbered by software patents, leading to very poor adoption outside the Apple ecosystem
Not supported by standard web browsers (except Safari), requiring server-side or client-side conversion for web delivery
Windows requires downloading a separate (often paid) extension from the Microsoft Store to view natively