A CR2 file is a raw image file created by Canon cameras instead of a standard photo

When you take a picture on a Canon DSLR or mirrorless camera, you can choose to save it as a CR2 file — the raw format Canon uses. A raw file contains all the unprocessed data the camera sensor captured, without any compression or automatic adjustments. Think of it like the camera's original notes before it decides what the final photo should look like.

A standard photo file like a JPG is already processed: the camera has applied color correction, sharpness, contrast, and other settings automatically. A CR2 file skips all that and gives you the raw sensor data instead. This means you have much more control when you edit the photo later, but the file is also much larger and requires special software to open.

CR2 stands for Canon Raw 2, the second version of Canon's raw format. The first version, CR, is now obsolete. You will see CR2 files from Canon EOS cameras made roughly from 2004 onward, though the exact format varies slightly between camera models.

Key Takeaways

  • CR2 files contain unprocessed sensor data from Canon cameras, giving you more control during editing than JPG files offer.
  • CR2 files are much larger than JPG files — typically three to five times bigger — because they store more information.
  • You need software that supports raw files to open a CR2, such as Adobe Lightroom, Photoshop, Canon's Digital Photo Professional, or free tools like RawTherapee.
  • Most cameras let you choose between saving as CR2 or JPG, or both at the same time, depending on your needs.

Why photographers choose CR2 over JPG

The main reason to shoot in CR2 is editing flexibility. When you adjust a JPG in Photoshop or Lightroom, you are working with data the camera already processed and compressed. If the camera got the white balance wrong, or made the shadows too dark, you have limited room to fix it without losing quality. A CR2 file gives you the original sensor data, so you can recover detail in shadows, fix white balance completely, and adjust colors without degradation.

Photographers who shoot portraits, landscapes, or any work where the final image matters more than speed usually prefer CR2. You can shoot dozens of photos, then spend time in editing to make each one look exactly how you want. If you are shooting events where you need photos ready when ready, or if you just want to take pictures without editing, JPG is faster and simpler.

Another reason is archival. A CR2 file is your original negative — you can always re-edit it later if your style changes or if you want a different version. A JPG is the final print. Many photographers keep CR2 files as backups for important shoots.

How to open and edit CR2 files

You cannot open a CR2 file in standard photo viewers like Windows Photos or Mac Preview. You need software designed for raw files. Adobe Lightroom is the most common choice for photographers — it opens CR2 files directly and lets you adjust exposure, white balance, color, and sharpness before converting to JPG or other formats. Adobe Photoshop also opens CR2 files, though it requires an extra step through Adobe Camera Raw.

Canon Digital Photo Professional is Canon's own free software and comes on a disc with many Canon cameras. It opens CR2 files and handles the format perfectly, though many photographers find it slower and less intuitive than Lightroom. RawTherapee and Darktable are free alternatives that work on Windows, Mac, and Linux.

The typical workflow is: open the CR2 in Lightroom, adjust the exposure and colors, then export as a JPG or PNG for sharing or printing. You keep the CR2 as your original file. Some photographers convert CR2 to DNG (Digital Negative), an open-source raw format, for long-term storage, though CR2 is stable and widely supported.

File size and storage considerations

A single CR2 file from a modern Canon camera is typically 30 to 50 megabytes, compared to 5 to 10 megabytes for a JPG from the same camera. If you shoot in CR2 exclusively, you will fill memory cards and hard drives much faster. A 64 GB memory card might hold 1,000 JPG photos but only 200 to 300 CR2 files.

This matters for backup and archival. If you shoot important work in CR2, you need a plan to store those files safely — external hard drives, cloud backup, or both. Many photographers use a tiered system: keep recent CR2 files on fast external drives for active editing, then move older ones to slower archive drives or cloud storage.

Some cameras let you shoot both CR2 and JPG simultaneously, creating two files for each photo. This gives you the editing power of CR2 and the convenience of JPG, but doubles your storage needs. It is a common choice for professional photographers who need both flexibility and quick delivery.

CR2 versus other raw formats

Every camera manufacturer uses its own raw format. Nikon uses NEF, Sony uses ARW, Fujifilm uses RAF. CR2 is specific to Canon. If you switch camera brands, you will need to learn a new raw format, though the editing process is similar across all of them.

Some photographers convert all their raw files to DNG (Digital Negative), an open format created by Adobe. DNG is not proprietary to any camera brand, so it may be more stable for long-term archival. The conversion is lossless — you do not lose any image data — but it is an extra step. Most photographers stick with their camera's native format unless they have a specific reason to change.

When to use CR2 and when to use JPG

Use CR2 if you plan to edit your photos significantly, if you are shooting work that matters (portraits, commercial, fine art), or if you want to keep originals for future re-editing. Use JPG if you want quick results, if you are shooting casually, or if you need to share photos when ready without editing.

Many photographers use both: shoot in CR2 for important work, JPG for casual shots. Some cameras let you set different modes for different situations. Check your camera's menu to see whether you can choose CR2, JPG, or both.

Frequently Asked Questions

Can I convert a CR2 file to JPG?

Yes. Open the CR2 in Lightroom, Photoshop, or another raw editor, make any adjustments you want, then export as JPG. You can also convert without editing — just open and export. The JPG will be smaller and easier to share, but you lose the ability to re-edit the raw data later.

Why is my CR2 file not opening?

Your software may not support that specific camera model. Canon releases new cameras regularly, and raw editors sometimes lag behind. Try updating your software to the latest version, or read a free tool like RawTherapee. If the file is corrupted, you may not be able to recover it.

Do I need to keep both the CR2 and the JPG?

No. Keep the CR2 as your original, and delete the JPG after you export it from editing. The CR2 contains all the information you need. If you shoot both simultaneously for convenience, you can delete the JPG later to save space.

Is CR2 the same as RAW?

CR2 is a type of raw file — it is Canon's version of raw. Raw is the general category; CR2, NEF, ARW, and RAF are all raw formats from different manufacturers. When someone says "shoot in raw," they usually mean shoot in your camera's native raw format, which is CR2 for Canon.

Can I edit a CR2 file in regular photo editing software?

Not directly. Software like Paint or basic photo apps cannot open CR2 files. You need software designed for raw files, such as Lightroom, Photoshop, or free tools like RawTherapee. Once you export the CR2 as JPG, you can edit it in any photo software.