What is a CR3 file?
The .CR3 file extension primarily belongs to the Canon Raw 3 Image format. Modern digital cameras from Canon use this format to save raw, uncompressed sensor data. The .CR3 format relies on the underlying structure of the MP4 media format. This structure allows the camera to save high-quality image data efficiently. Occasionally, a .CR3 file might also be a macOS resource fork file, though this is rare. Because .CR3 has multiple possible meanings, we recommend viewer.online/cr3 to identify the actual format of your file.
How to open CR3 files?
You can open standard .CR3 files using the official Canon Digital Photo Professional software. Professional image editing tools like Adobe Photoshop and Adobe Lightroom also offer full support for .CR3 files. If you do not want to install large software packages, viewer.online/cr3 analyzes .CR3 files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Software and tools
Photographers often use command-line tools like ExifTool to inspect the metadata inside .CR3 files. Software libraries like LibRaw help developers extract image data from these raw files for custom applications.
Best practices and troubleshooting
Raw image files are large and difficult to share directly on the web. If you want to send a photo to a client or upload it to a social network, you should convert it to a standard web format. We recommend converting your files to .JPG or .PNG on convert.guru. If your operating system fails to show a preview of a .CR3 file, you may need to update your system camera raw codecs or use a dedicated viewing tool.
Summary
Because .CR3 files use the known MP4 format, viewer.online/cr3 can safely open and display them online, eliminating compatibility problems.