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Supports: CR2
CR2 (Canon Raw Version 2) is Canon's proprietary RAW format, introduced in 2004 with the EOS 350D and used by every Canon DSLR through about 2018 — 5D / 5D Mark II / III / IV, 6D / 6D Mark II, 7D / 7D Mark II, 60D / 70D / 80D, and the Rebel T-series. Each CR2 carries 14-bit sensor data and runs 20-30 MB per frame, ready for non-destructive edits in Canon Digital Photo Professional (DPP4), Lightroom, Capture One, or DxO PhotoLab. HEIC (Apple's filename for a HEIF container using HEVC compression, adopted as the iPhone default in iOS 11 in 2017) is the modern mobile photo format — typically about 1/10 the size at indistinguishable viewing quality, and the native format for iPhone, iPad, Mac, and iCloud Photos. Common reasons photographers convert CR2 to HEIC:
| Property | CR2 (Canon RAW v2) | HEIC |
|---|---|---|
| Compression | Lossless RAW | Lossy HEVC (very efficient) |
| File size (24 MP photo) | 25-30 MB | 2-3 MB |
| File size (50 MP 5DS R) | 60-75 MB | 5-8 MB |
| Bit depth | 14 bit per channel | 8 or 10 bit per channel |
| Editing flexibility | Full RAW control (exposure, WB, highlights) | Limited — image is already developed |
| Native viewer | Canon DPP4, Lightroom, Capture One, DxO PhotoLab, RawTherapee | iOS, iPadOS, macOS, Windows 10+ (HEIF extension), Android 10+ |
| Year introduced | 2004 (Canon EOS 350D) | 2017 (Apple iOS 11 adoption) |
| Cameras that produce it | Canon DSLRs 2004-2018 (5D, 6D, 7D, 70D / 80D, Rebel) | N/A — output format |
| Best for | Editing, archival, RAW masters | Mobile viewing, iCloud storage, AirDrop |
| 500-photo shoot size | ~14 GB | ~1.4 GB |
| Preset | Visual quality | Size vs CR2 | Best for |
|---|---|---|---|
| Highest | Visually identical at 100% zoom | ~10-15% of CR2 | HEIC copies you may revisit closely |
| Very High (default) | Indistinguishable for normal viewing | ~7-10% of CR2 | iPhone / iPad libraries, iCloud uploads |
| High | Indistinguishable at typical viewing distance | ~5-7% of CR2 | Shareable proofs, AirDrop to clients |
| Medium | Minor softening on close inspection | ~3-5% of CR2 | Casual sharing, social posts |
| Low / Lowest | Visible compression on detailed images | ~1-2% of CR2 | Tiny previews, contact sheets |
Yes — that is the fundamental trade-off. CR2 carries 14-bit unprocessed sensor data so you can re-tune exposure, white balance, and highlight recovery in DPP4, Lightroom, or Capture One. HEIC stores a developed image: the conversion bakes in the current rendering. The professional workflow is to keep the CR2 masters in cold storage (NAS, external drive, or Backblaze) and convert HEIC copies for viewing, sharing, and Apple-device libraries. If you ever need to re-edit, go back to the CR2.
Every Canon DSLR from 2004 through about 2018 wrote CR2 in RAW mode — 5D / 5D Mark II / III / IV, 5DS / 5DS R, 6D / 6D Mark II, 7D / 7D Mark II, 60D / 70D / 80D, and the Rebel T-series (T3i through T7i). Newer Canon mirrorless and DSLR bodies (R, RP, R5, R6, R7, R8, R10, R50, R100, 1D X Mark III, 90D, 250D, M50) shoot CR3 instead. If your camera is from 2018 or later and writes .CR3 files, see CR3 to HEIC instead.
Windows 10 and 11 support HEIC after installing the free HEIF Image Extensions from the Microsoft Store (Apple covers the codec license). macOS, iOS, and iPadOS open HEIC natively. Modern Android (10+) handles HEIC in the Photos / Gallery apps. Older Windows 7 / 8 systems and many Linux desktops still need a third-party viewer or codec. If your audience is mixed-platform or older, consider CR2 to JPG instead for universal compatibility.
For typical 20-24 MP CR2s from a 5D Mark III, 6D, or 80D, expect roughly 90% reduction at Very High preset — a 26 MB CR2 lands around 2-3 MB as HEIC. For 30 MP CR2s from a 5D Mark IV or 50 MP from a 5DS R, a 35-65 MB file lands around 4-8 MB. Highly detailed scenes (foliage, fine fabric, busy backgrounds) compress slightly less; flat areas like sky or studio backdrops compress more. Choosing Highest preset roughly doubles file size compared to Very High but is closer to lossless visually.
Yes. EXIF metadata (camera body, lens model — EF 24-70mm f/2.8L II, EF 70-200mm f/2.8L IS III, EF-S 17-55mm f/2.8 — aperture, shutter, ISO, capture date, GPS if your body recorded it) and embedded ICC color profiles transfer to the HEIC output. iPhone Photos and macOS Preview will read the right capture date so the photos slot into the correct chronological place in your library, and the color profile keeps tones consistent on Wide-Gamut and P3 displays.
Close, but not identical. Canon DPP4 applies the in-camera Picture Style (Standard, Portrait, Landscape, Faithful, Neutral, Monochrome) and any custom curves you set on the body. Lightroom applies Adobe's default RAW interpretation. The inline conversion uses neutral demosaicing defaults — colors are accurate but not "Canon-rendered" with Picture Style baked in. For client deliverables where color science matters, edit in DPP4 or Lightroom first and export to HEIC from there. For quick iCloud uploads and personal libraries, the inline conversion is great.
HEIC tops out at 10 bits per channel (HEVC Main 10 profile), versus CR2's 14-bit RAW data. For viewing on phones and tablets the difference is invisible. For master archives where you may push tones aggressively in future edits, keep the CR2. The HEIC is a delivery format, not a master format.
The byte content is essentially the same — HEIF is the container standardized by MPEG, HEIC is Apple's specific filename for HEIF using HEVC compression. iOS, macOS, and Windows treat them identically. Pick HEIC when you need the file to slot cleanly into Apple Photos, AirDrop, or anything that filters by extension. If you prefer the .heif extension, use CR2 to HEIF instead.
Yes — drop in folder-fulls. Each CR2 converts in your browser session (limited only by your CPU and memory) and downloads as a ZIP. For multi-gigabyte shoots, processing is browser-side so there's no upload bottleneck — the limit is your machine's RAM, not network bandwidth. A 2,000-frame wedding archive from a 5D Mark IV stays entirely on your machine.
Yes. Drop the converted HEICs into Photos on Mac or import via the Photos app on iPhone / iPad and they appear as native HEIC images. Date-taken EXIF determines their slot in the timeline, so older CR2s from a 2012 5D Mark III land in the correct chronological place. Once they sync to iCloud, they show up at full resolution on every device signed into the same Apple ID.