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File Format Guide
What is a CR2 file?
CR2 is Canon's RAW format from the era of the 20D through to the mid-2010s. It sits between the older CRW and the current CR3, and the three are different enough that software supporting one may well refuse the others.
CR2 at a glance
What are CR2, CR3, and CRW files?
Proprietary RAW image files created by Canon digital cameras. They contain uncompressed, unprocessed sensor data. CRW is the oldest, CR2 is the standard, and CR3 is the newest (supporting compressed RAW).
How to open them?
Adobe Lightroom, Photoshop (via Camera Raw), Apple Photos, or Canon's Digital Photo Professional.
Typical use:
Professional photography using Canon cameras, allowing maximum flexibility in post-processing (exposure, white balance).
Origin:
Developed entirely by Canon.
Modern alternatives:
DNG (Digital Negative) is often used to standardize RAW files across different camera brands.
CR2 specifications
Full name
Canon RAW version 2
File extensions
.crw (2001), .cr2 (2004), .cr3 (2018)
Container
CR2 is TIFF-based; CR3 uses the ISO base media format (like MP4)
Compression
CR2 is losslessly compressed; CR3 adds an optional lossy C-RAW mode
Colour depth
14 bits per channel on most models (12-bit on older bodies)
Embedded previews
Full-size JPEG plus smaller thumbnails
Cameras
Canon EOS digital SLRs and mirrorless
Browser support
None
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Three generations, three formats
CRW came first, in 2001, using Canon's own CIFF container. CR2 replaced it in 2004 with a TIFF-based structure, which is why generic TIFF tools can often at least parse the file even if they cannot develop it. CR3 arrived in 2018 with the EOS M50 and switched to the ISO base media file format — the same container family as MP4.
That last change was a real break. CR3 was not merely a revision of CR2 but a different structure entirely, and open-source support took well over a year to arrive because the format had to be reverse-engineered from scratch. If a program opens your CR2 files but not your CR3 files, this is why.
C-RAW: the lossy option
CR3 introduced C-RAW, which Canon markets as compact RAW. It reduces file size by roughly 40% and, unlike standard CR2 compression, it is lossy — data is genuinely discarded. Canon's implementation is conservative and the difference is invisible in normal use.
It shows up at the extremes: heavy shadow lifting, aggressive exposure recovery, and strong noise reduction can reveal artefacts that would not appear in a full RAW. For everyday shooting the space saving is a reasonable trade. For work you expect to push hard in post, shoot full RAW.
The embedded preview
Every Canon RAW contains a full-resolution JPEG rendered by the camera using whatever Picture Style was active, plus smaller thumbnails. This is what appears on the rear screen, what file managers show, and what a browser-based converter can extract without needing to decode the sensor data at all.
It is a genuinely useful shortcut when you need a shareable JPEG immediately. It is not a substitute for developing the RAW, because it reflects the camera's in-body processing rather than any choice of yours.
Convert CR2 files in your browser
Zolvo's image converter runs entirely on your own machine — your files are never uploaded to a
server. Drop a CR2 file in and pick an output format, or jump straight to a common one:
CR2 is TIFF-based and was used from 2004 until around 2018; CR3 uses the ISO base media container instead and adds the optional lossy C-RAW mode. They are structurally different formats, so software supporting CR2 does not automatically support CR3.
Can I open a CR2 file without Canon software?
Yes. Lightroom, Capture One, darktable, RawTherapee, and both Windows and macOS handle CR2 natively for most camera models. Very recent bodies may need a software update before their files are recognised.
Is C-RAW worth using?
For most shooting, yes — around 40% smaller files with no visible difference. Because it is genuinely lossy, avoid it for work you expect to push hard in post-processing, such as heavy shadow recovery or major exposure corrections.
How do I convert CR2 to JPG quickly?
Extracting the full-size JPEG preview that the camera embedded in the file gives you a shareable image in seconds without any RAW development. For images you intend to edit properly, develop the RAW in dedicated software instead.
