Pull a card out of a Canon camera, copy the files to your PC, and double click one of those CR2 photos. Windows often shrugs. You get a generic icon, a "we can't open this file" message, or a thumbnail that never loads. The shot is fine; Windows just does not speak Canon RAW out of the box. Here is how to open CR2 files on Windows, from the fastest free fix to a private way to view, organize, and develop them for good.
What a CR2 file actually is
CR2 is Canon's RAW format, used across most Canon DSLRs and many older mirrorless bodies (newer Canon cameras moved to CR3). A RAW file is not a finished picture. Instead of baking in color, sharpening, and contrast the way a JPEG does, it stores the sensor's unprocessed readout plus a bundle of metadata. That gives you far more room to recover highlights, fix white balance, and push shadows later. The trade off is that something has to interpret the sensor data before you see a normal photo, and plain Windows has no built in interpreter for it.
Why Windows struggles with CR2 by default
For years the built in Photos app and File Explorer treated Canon RAW as an unknown blob. Newer builds of Windows 11 handle some RAW types once you add an extension, yet coverage is patchy and older CR2 files from a decade ago can still refuse to preview. Each camera model also has its own color science, so a viewer that lacks the right profile may render a CR2 with a greenish or washed out cast even when it does manage to open it. Getting accurate color, not just any color, is the real goal.
Option 1: add the Microsoft Raw Image Extension
If you only need a quick preview inside the Windows Photos app, Microsoft offers a free Raw Image Extension in the Store. Install it, reboot the Photos app, and many CR2 thumbnails and previews start rendering. Good for a fast look. Keep two limits in mind, though: it leans on Windows for format support, so very old or unusual CR2 variants can still fail, and it gives you almost no control over how the RAW is interpreted. You are viewing, not developing.
Option 2: use Canon's Digital Photo Professional
Canon ships a free app called Digital Photo Professional (DPP) with its cameras, and you can download it from Canon's support site using your camera model. Because it comes from Canon, color rendering is faithful and every CR2 your body produces will open. DPP is capable, if a little dated in feel, and it is built around editing single files rather than running a whole library. Many photographers use it to open the odd CR2, then reach for something else to actually organize thousands of them.
Option 3: convert CR2 to JPEG
Sometimes you just want a shareable file. Converting a CR2 to JPEG bakes a chosen interpretation into a universal format that opens anywhere. The catch is that a JPEG throws away the editing latitude that made you shoot RAW in the first place, so convert copies and keep the CR2 originals. We walk through that process in detail in our guide to converting RAW to JPEG without losing quality.
Option 4: open CR2 inside a private photo organizer
Quick extensions and single file editors solve one photo at a time. What most people really want is to point software at a folder full of Canon shots and have every CR2 open, render correctly, and stay organized. That is where Memora fits. It is a Windows photo manager that decodes CR2 natively, so you are not depending on a Store extension or juggling a separate viewer per camera.
Under the hood, Memora runs a three tier RAW decoder (rawloader, then rawler, then LibRaw) that covers more than a thousand cameras, and it pulls the correct per camera color profile so your Canon files look the way the scene did. Decoding and previewing RAW sits in the free tier, which means you can open and browse your CR2 library without paying anything. You can read more about the engine on the RAW support page.
Opening a CR2 file in Memora, step by step
Getting started takes about a minute:
First, add the folder that holds your Canon photos as a watched folder. Memora indexes the CR2 files in place and never moves or rewrites them, so the originals on disk stay exactly as the camera wrote them. Second, let the first index pass finish; thumbnails and full previews build as it works through the folder. Third, click any CR2 to see it full size with camera accurate color, and open the develop panel if you want to adjust exposure, white balance, or contrast.
Every adjustment you make is stored as data in the catalog rather than written back into the CR2 itself. Your edit is a set of instructions layered over an untouched original, which is what non destructive editing means. Change your mind a month later and the pristine RAW is still sitting there, ready to be reinterpreted from scratch.
Turning a CR2 into something you can share
When a photo is ready to leave your machine, export it. Memora writes out JPEG, PNG, TIFF, WebP, or BMP with your edits applied and the EXIF intact, so capture date, camera, lens, and copyright ride along. One honest note worth stating plainly: export goes out to those standard formats, and there is no option to re save a file back into CR2 or any other RAW. RAW is where a photo starts, not a wrapper you export back into, and that is true of every serious RAW tool.
Which Canon and other RAW formats are covered
Beyond CR2, the same decoder opens Canon CR3 plus the common RAW types from other brands: NEF (Nikon), ARW (Sony), RAF (Fujifilm), ORF (Olympus), RW2 (Panasonic), DNG, PEF, SRW, and more. Mixed shooter households tend to appreciate that, since one library quietly swallows files from every camera in the house. If you shoot a newer Canon body, our walkthrough on opening CR3 files on Windows covers that sibling format.
Is it private to open RAW this way?
Yes, and this is the part cloud tools cannot match. Decoding, previewing, editing, searching, and organizing all run on your own PC. No CR2, thumbnail, or edit is uploaded anywhere. In the interest of being straight with you, a few small connections do happen, and they are worth knowing about: Memora contacts shutterdev.com only to check your license and for updates, and when it meets a camera model for the first time it fetches that model's color profile by sending just the make and model text (for example "Canon EOS 5D Mark IV"), never the photo. AI models download once if you use features like semantic search. Those are the only times anything leaves the machine, and your actual images are never part of it. Worth noting too: the local catalog is not encrypted, so protecting the PC itself with disk encryption and a strong password is on you.
So which option should you pick?
Need a one off peek at a single frame? Add the Microsoft Raw Image Extension and move on. Working through a serious edit on one or two files? Canon's DPP renders them faithfully. But if you have hundreds or thousands of CR2 files and you want them to open reliably, look right, stay organized, and never leave your computer, a dedicated local organizer earns its keep. You can see the full feature set on the photo organizing software overview. Memora runs on Windows 10 and 11, keeps a free tier for exactly this kind of RAW viewing, and treats your Canon originals as something to read, not rewrite.