What is C-RAW and does it lose quality?

C-RAW is Canon's compact RAW option inside the same .CR3 container — roughly 40 percent smaller files with a small amount of data discarded during compression. For most work the difference is invisible; for heavy shadow recovery or extreme edits, standard RAW keeps the full latitude.

What Is a CR3 File? Canon's RAW Format, Explained

Q: What does CR3 stand for?

CR3 is the third generation of Canon RAW. Canon introduced it in 2018 with the EOS M50, and every EOS R mirrorless body since writes .CR3 files: the unprocessed sensor data from the moment of exposure, plus metadata and embedded JPEG previews.

Q: Which cameras write CR3 files?

The entire EOS R mirrorless line (R, RP, R3, R5, R6, R7, R8, R10, R50, R100 and their successors), the EOS M50 family, late DSLRs such as the 90D, 250D and 1D X Mark III, and recent PowerShot G-series compacts. Earlier Canon DSLRs write CR2 instead.

Q: How do I open a CR3 file on a Mac?

macOS has built-in RAW support for most CR3-era Canon bodies, so Preview and Photos open the files directly. Files from a just-released camera can fail until Apple ships an update. To actually develop the file rather than just view it, use a RAW editor — RevelRaw opens CR3 files with drag and drop on any Mac.

Q: Can RevelRaw open CR3 files?

Yes. RevelRaw is built around Sony Alpha, but it opens Canon CR3 files all the same — drag one in or pick it from File > Open, and every preset, AI scene detection and fine-tune control works on it. Exports go out as JPEG, PNG, TIFF or HEIF.

Published July 24, 2026 · Daniel Tello · RevelRaw

A CR3 file is the third generation of Canon RAW — the format every EOS R mirrorless body writes when you shoot RAW. It is not a finished image. It is the unprocessed data from every photosite on the sensor at the moment you pressed the shutter, plus the camera's metadata and embedded JPEG previews, packed into one .CR3 file. Think of it as the digital negative: everything the camera saw, before anyone decided what the photograph should look like.

Canon introduced CR3 in 2018 with the EOS M50 and has used it in every new body since, replacing the older CR2 format that served the DSLR era. Here's what's inside one, and how to work with it on a Mac.

CR3 at a glance

Full name	Canon RAW, third generation
Extension	.CR3
Introduced	2018, with the EOS M50
Written by	All EOS R mirrorless bodies, EOS M50 family, late DSLRs (90D, 250D, 1D X Mark III), recent PowerShot G compacts
What it holds	Unprocessed 14-bit sensor data, EXIF metadata, embedded JPEG previews
Structure	Modern container from the same family as MP4 video and HEIF photos — unlike most RAW formats, which are built on TIFF
Typical size	Roughly 25–55 MB on 24–45 MP bodies; C-RAW about 40% smaller
Opens with	macOS Preview and Photos, Canon Digital Photo Professional, and RAW editors such as RevelRaw, Lightroom or Capture One

What's actually inside a CR3 file

A camera sensor doesn't record a picture. Each photosite records how much light hit it through a single-color filter — red, green or blue — arranged in a mosaic. A CR3 file stores those readings as they came off the sensor:

The mosaic sensor data. One brightness value per photosite, at 14-bit precision. No white balance, no sharpening, no Picture Style has been applied yet. Turning this mosaic into a viewable photograph is the job of your RAW editor.
Metadata. Camera body, lens, exposure settings, autofocus information, and the Picture Style you had dialed in. Editors read this to know how to interpret the data; nothing in it is baked into the pixels.
Embedded JPEG previews. The camera develops previews with its own processing and tucks them inside the CR3. That's what you see on the camera's screen and in Finder thumbnails — which is why a RAW file can look one way as a thumbnail and another once an editor opens the real data.

CR3 vs CR2: what changed

The older CR2 format was built on TIFF, like most camera RAW formats. CR3 moved to a modern container — the same family as MP4 video and HEIF photos — which compresses more efficiently and gave Canon room for a second trick: C-RAW, a compact RAW option in the same .CR3 wrapper. C-RAW files run roughly 40% smaller by discarding a little data during compression. For most photographs the difference never shows; if you routinely pull shadows three stops or push extreme edits, standard RAW keeps the full latitude. If your camera writes .CR2 files instead, it predates the switch — that format has its own page.

How to open CR3 files on a Mac

macOS ships with RAW support for most CR3-era Canon bodies, so the basics are already on your Mac: Preview opens the files with a double-click, and Photos imports them. Two caveats. First, files from a just-released camera can fail to open until Apple ships a RAW update for that body — the file isn't broken; your software just hasn't met that camera yet. Second, Preview only shows you a develop of the RAW; it isn't an editor.

To actually develop the file — choose your own white balance, recover highlights, work the color — you need a RAW editor. RevelRaw is built around Sony Alpha, but it opens Canon CR3 files all the same: drag one in or pick it from File > Open, and AI scene detection ranks 40+ presets against your photo, with the standard fine-tune controls on top. Everything runs on your Mac; no file ever leaves it. Canon's own Digital Photo Professional (free with your camera) and the big subscriptions — Lightroom, Capture One — read CR3 as well.

How to convert CR3 to JPEG

For a quick conversion with no editing, Preview can do it: open the CR3, then File > Export, choose JPEG, and set the quality. For a conversion that's actually developed — your exposure, your color — open the file in a RAW editor and export. RevelRaw exports JPEG, PNG, TIFF and HEIF, with platform presets for Instagram, print and web. Either way, keep the CR3 afterwards: it's the negative, and every JPEG is just one interpretation of it.

FAQ

What does CR3 stand for?

Canon RAW, third generation — successor to CR2 and the original CRW. Canon introduced it in 2018 with the EOS M50, and every EOS R body writes it.

Which cameras write CR3 files?

The entire EOS R mirrorless line, the EOS M50 family, late DSLRs such as the 90D, 250D and 1D X Mark III, and recent PowerShot G-series compacts. Earlier DSLRs write CR2.

How do I open a CR3 file on a Mac?

Double-click it: Preview handles files from most CR3-era bodies. Files from a just-released camera may need to wait for a macOS RAW update. To develop rather than just view the file, use a RAW editor such as RevelRaw.

What is C-RAW — does it lose quality?

Canon's compact RAW option inside the same .CR3 container: roughly 40% smaller, with a little data discarded in compression. Invisible for most work; for heavy shadow recovery, standard RAW keeps more latitude.

Can RevelRaw open CR3 files?

Yes. Drag a CR3 in and it opens like any other RAW — presets, scene detection and fine-tune controls all work. Exports go out as JPEG, PNG, TIFF or HEIF.

See what's really in your CR3 files. Download RevelRaw, drop one in, and watch it ranked against 40+ presets in seconds — with one full-quality export on the house. Get it on the Mac App Store.