About CR3 (Canon RAW v3)
CR3 replaced CR2 as Canon's RAW format in 2018, first appearing on the EOS M50 and now used across the EOS R mirrorless line and recent DSLRs. Under the hood it swaps CR2's TIFF structure for an ISO base media container — the same family as MP4 — and adds C-RAW, an optional compressed mode that cuts file size roughly in half with a small quality tradeoff.
As with any RAW format, a CR3 is the sensor's output before in-camera processing, which makes it ideal for serious editing and inconvenient for everything else. Newer formats also lag in software support, so CR3 files from a recent body sometimes will not open even in tools that handle CR2 fine.
You can convert CR3 to a universal format right here in your browser — free, private, nothing uploaded, no account. Creating CR3 is not supported, and would not make sense outside a Canon camera anyway. The rendering is neutral, so expect colors that may differ from Canon's own processing.
Strengths
- Canon's current format, carrying the full sensor data from modern EOS R bodies
- C-RAW option keeps most RAW flexibility at meaningfully smaller sizes
- Modern container design with richer embedded previews and metadata than CR2
Limitations
- Newer format, so older software and some tools still cannot open it
- Files are large and unusable in most apps until converted
- This site can read CR3 but not write it
- Neutral rendering may differ from the color science in Canon's software
C-RAW: compressed RAW, and whether you should use it
C-RAW is Canon’s lossy compressed RAW mode, and the name causes confusion because people assume lossy RAW is a contradiction. It is not: a C-RAW file still contains sensor data with the white balance unapplied and the full tonal range intact, so you keep the editing latitude that makes RAW worth shooting. What it discards is a portion of the fine detail and noise, in a way designed to be invisible at normal viewing sizes, and the file comes out roughly 40–50% smaller.
In practice, C-RAW is a reasonable default for most work — event coverage, travel, anything where card space and buffer depth matter more than the last increment of quality. Where it costs you is at the extremes: heavy shadow lifting, aggressive cropping into fine texture, or high-ISO frames where the compression interacts badly with noise. Landscape and studio photographers who routinely push files hard tend to stay on uncompressed RAW for that reason.
Why newer RAW formats are harder to open
Camera makers do not publish RAW specifications, so every RAW processor supports a new format by reverse-engineering it, one camera model at a time. When CR3 arrived in 2018 it took months for open-source tooling to handle it, and each new Canon body since has needed its own support work because the sensor data layout varies between models. This is why a photo tool can open CR3 files from one camera perfectly and refuse files from a newer one.
The practical consequence is that RAW files are a poor archival format on their own. If long-term readability matters to you, the usual advice is to keep the original RAW and store either a DNG copy — openly documented, so it does not depend on anyone reverse-engineering anything — or a high-quality TIFF or JPEG export representing how you actually processed the image.
Frequently asked questions
- Which cameras produce CR3 files?
- The EOS R mirrorless line — R5, R6, R7, R8, R10, R50, R100 and siblings — plus the EOS M series from the M50 onward and recent DSLRs including the 90D and 250D. If your Canon body is from 2018 or later, it almost certainly shoots CR3 rather than CR2.
- Is C-RAW worth using?
- For most photography, yes: files are roughly 40–50% smaller and the difference is invisible in normal use, while you keep RAW’s white balance and exposure latitude. The exceptions are work that gets pushed hard in post — deep shadow recovery, heavy cropping, or high-ISO frames — where uncompressed RAW holds up better.
- Why will my software not open CR3 files from my new camera?
- RAW formats are undocumented, so support has to be reverse-engineered for each camera model individually. A tool that handles CR3 from a 2019 body may not yet handle a body released last year. Updating your software usually fixes it; converting to JPEG or PNG works regardless of what your editor supports.
- Should I convert my CR3 files to DNG for archiving?
- It is a defensible strategy. DNG is openly documented, so it does not depend on anyone continuing to reverse-engineer Canon’s format. Many photographers keep the original CR3 and store a DNG alongside it. This site cannot create DNG files — it converts RAW into viewable formats like JPEG, PNG, and WebP, which is a different job — so DNG archiving needs Adobe’s free DNG Converter or a RAW editor.