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CR2 converter

A .cr2 file is a Canon RAW photograph, the second-generation format Canon's DSLRs wrote from 2004 until the switch to CR3 in 2018. It records the sensor's mosaiced readout before white balance, sharpening, or color rendering are baked in, giving full latitude to reprocess the shot later.

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Batch files can each use a different output. Nothing uploads for local conversions.

Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.

Where CR2 comes from

Canon introduced CR2 with the EOS-1D Mark II in 2004, replacing the earlier CRW format with a TIFF-based design. Fourteen years of EOS DSLRs — from the Digital Rebel line to the 5D series — produced CR2 files, so an enormous installed base of images exists even though new cameras have moved on.

How CR2 works

  • TIFF container with multiple IFDs holding the raw sensor image and several embedded JPEG previews
  • Sensor data is 12- or 14-bit per photosite (14-bit from roughly 2008 onward) under a Bayer color filter array
  • Raw samples are compressed with lossless JPEG (ITU-T T.81 process 14)
  • sRAW and mRAW reduced-resolution variants exist on some bodies, storing partially processed YCbCr data
  • Canon MakerNotes carry autofocus points, lens identity, and dust-mapping data

When to use CR2

  • Developing photos from Canon DSLRs with full exposure and white-balance latitude
  • Re-editing archives from the 2004-2018 EOS era with modern raw engines
  • Recovering highlight detail that a camera JPEG would have clipped

Strengths and limitations

Strengths

  • Complete sensor information: white balance and color rendering stay adjustable
  • 12-14 stops of usable dynamic range from later sensors
  • Extremely well supported by raw processors after two decades in the field

Limitations

  • Files run 20-40 MB where a JPEG would be a few megabytes
  • Cannot be used directly on the web or in documents without development
  • Canon no longer produces cameras that write it, freezing the format in time

Compatibility

Every serious raw developer — Lightroom, Capture One, DxO, darktable, RawTherapee — handles CR2, and Windows and macOS both thumbnail it through their built-in raw codecs. Browsers have no native support, so web-based work relies on LibRaw compiled to WebAssembly to demosaic the file client-side.

Full EXIF including lens and exposure data, extensive Canon MakerNotes, and XMP sidecar or embedded metadata are all standard; MakerNotes hold camera-specific details generic tools may not parse.

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