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CR2

Canon's TIFF/EP-based RAW format used from 2004 until superseded by CR3 in 2018, storing raw sensor data alongside an embedded JPEG preview and Exif/MakerNotes metadata.

Extension

.cr2

Full name

Canon Raw version 2

Introduced

2004, with the EOS-1D Mark II

Vendor

Canon

What is inside the container

CR2 is structurally a TIFF file (TIFF/EP compliant) with a Canon-specific IFD holding MakerNotes such as lens data, white balance, and Picture Style settings. It embeds a full-size or near-full-size JPEG preview inside the file, which is what lets a DAM's thumbnail generator display a fast preview without running a full RAW decode.

How to open it

Canon native Canon Digital Photo Professional (DPP)
Cross-vendor commercial Adobe Camera Raw / Lightroom Classic
Cross-vendor commercial Capture One
Open source RawTherapee and darktable

For archives

CR2 is stable and well documented after two decades of continuous use, so keeping it as-is is low risk for now. Since Canon has fully moved to CR3 for current cameras, still budget for a DNG conversion pass on very long-term archives, or periodically re-verify that current raw processors still open older CR2 files correctly.

Canon introduced CR2 in 2004 with the EOS-1D Mark II, replacing its earlier CRW format, and kept it as the standard RAW format across the EOS line — DSLRs from the 20D through later Rebel and 1D-series bodies — for the better part of fourteen years. Being TIFF/EP-based made CR2 relatively easy for third-party software to support from the start, since it followed a documented structural convention rather than an entirely bespoke container.

In a DAM, CR2’s embedded JPEG preview is the workhorse feature: it lets a system generate a usable thumbnail instantly rather than waiting on a full raw-processing pass, which matters at the scale of a photo library with tens of thousands of RAW files. The metadata that actually matters for search and rights tracking — capture settings, lens, camera body — lives in Canon’s MakerNotes block, which most mainstream raw processors parse correctly given CR2’s age and ubiquity. The main archival consideration is generational: Canon’s current cameras all shoot CR3, so CR2 is now a legacy format from a support standpoint, even though it remains widely readable today.

Frequently asked

What lets a DAM generate a fast preview from a CR2 file?

CR2 embeds a full-size or near-full-size JPEG preview inside the file, which is what a DAM's thumbnail generator displays without running a full RAW decode.

Is CR2 structurally a standard TIFF file?

Yes. CR2 is TIFF/EP compliant, with a Canon-specific IFD holding MakerNotes such as lens data, white balance, and Picture Style settings layered on top.

Should a DAM convert CR2 masters to DNG right away?

Not urgently. CR2 is stable and well documented after two decades of continuous use, so keeping it as-is is low risk for now, though very long-term archives should still budget for an eventual DNG conversion pass.

Is CR2 still Canon's current RAW format?

No. Canon superseded CR2 with CR3 in 2018, so a DAM ingesting current Canon captures will increasingly see CR3 rather than CR2.

When was CR2 introduced?

2004, with the Canon EOS-1D Mark II.

What native Canon software opens CR2?

Canon Digital Photo Professional, alongside cross-vendor tools like Adobe Camera Raw/Lightroom Classic, Capture One, and open-source RawTherapee and darktable.

What metadata does CR2 carry beyond the pixel data?

Standard Exif fields plus a Canon-specific MakerNotes IFD covering lens data, white balance, and Picture Style settings.

What ongoing risk should a DAM watch for with CR2 archives?

Periodically re-verify that current raw processors still open older CR2 files correctly, since Canon's continuing development attention is now on CR3.

Sources