CONVERT
CR2 → ICO
Fast, secure CR2 to ICO conversion. No registration required.
DRAG. DROP. DONE.
Upload any file and our engines will handle format detection automatically.
Max 100 MB · Free plan · No signup required
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Here is the short version — CR2 is Canon's proprietary RAW photo format from its DSLR line. Hence the need for ICO. Need a ICO for a CMS, a chat message or an email client that politely refuses CR2? This tool re-encodes your image in the background and returns a drop-in ICO replacement. No registration, no watermark, no visual change beyond what the ICO encoder itself introduces. In practice CR2 is Canon's proprietary RAW photo format from its DSLR line. On the other end, ICO is the Windows icon container with multiple resolutions packed into one file.
Canon RAW CR2
Source formatCR2 is Canon camera RAW format containing unprocessed sensor data.
ICO Icon
Target formatICO is the icon file format used for favicons and Windows application icons. A single ICO file can contain multiple image sizes and color depths for different display contexts.
Why convert CR2 to ICO
Converting keeps the picture recognisable end-to-end while changing the container that ships it. ICO typically wins on one of three fronts: broader software support, smaller files for the same visual quality, or features like transparency that CR2 cannot express. The conversion itself is fast because both sides are raster formats.
HOW TO CONVERT
CR2 → ICO
Upload your CR2
Start by dropping the CR2 onto the uploader. Files up to 100 MB go through on the free tier without registration.
Conversion happens server-side
Our imagemagick-based pipeline reads the CR2 pixel grid, preserves resolution and colour profile, and encodes a clean ICO.
Grab the result
A download button appears as soon as the ICO is ready. Save locally or share the short-lived URL.
Common Use Cases
Cross-platform previews
Windows, macOS and Linux file browsers all render ICO thumbnails; CR2 support varies by OS version.
Mobile galleries
iOS Photos, Google Photos and Samsung Gallery index ICO instantly — CR2 sometimes falls back to a generic file icon.
Stock photography uploads
Shutterstock, Adobe Stock and similar marketplaces require ICO in their contributor guidelines.
Archive migration
Converting legacy CR2 archives to ICO future-proofs the collection against declining codec support.
CR2 vs ICO — Strengths and limitations
What each format does best, and where it falls short.
CR2 Strengths
- Mature — 13 years of camera bodies and tooling.
- Preserves every bit of Canon sensor data for post-processing.
- Embedded JPEG preview makes browsing fast.
- Supported by every major raw processor.
Limitations
- Proprietary — no official spec, tool support depends on reverse engineering.
- Canon-only tags (Picture Styles, DPP adjustments) are lost when processed outside DPP.
- Superseded by CR3 in 2018 — format is frozen.
ICO Strengths
- Multi-resolution: one file, many sizes, OS picks the right one.
- Universal favicon support in every browser since IE5.
- Supports transparency (1-bit since 1985, full alpha since XP).
- Tiny file size — an entire favicon pack typically fits in under 15 KB.
- No licensing or patent concerns — fully in the public domain spec-wise.
Limitations
- Cannot compress continuous-tone images efficiently — use PNG or WebP for photos.
- Format is essentially frozen in 1999 — no HDR, no wide gamut, no modern features.
- Maximum image dimension is 256×256 px (inside an ICO container).
CR2 vs ICO — Technical specifications
Side-by-side comparison of the technical details.
| Specification | CR2 | ICO |
|---|---|---|
| MIME type | image/x-canon-cr2 | image/vnd.microsoft.icon |
| Extension | .cr2 | — |
| Container | TIFF/EP with Canon private tags | — |
| Bit depth | 14-bit (most bodies); 12-bit (some) | — |
| Successor | .cr3 (EOS M50 onward, 2018) | — |
| Max resolutions per file | — | 65 535 images |
| Max single image size | — | 256×256 px |
| Color depths | — | 1, 4, 8, 24, 32 bits per pixel |
| Compression | — | Uncompressed bitmap or embedded PNG (Vista+) |
CR2 vs ICO — Typical file sizes
Approximate file sizes for common scenarios.
CR2
- 22 MP CR2 (5D Mark III) 25-35 MB
- 50 MP CR2 (5DS/5DS R) 55-75 MB
ICO
- Classic favicon (16×16 only) < 2 KB
- Multi-size favicon pack (16/32/48/256) 5-15 KB
- Full Windows app icon set 20-100 KB
Quality & Compatibility
Converting keeps resolution, aspect ratio and colour profile identical to the source. Metadata (EXIF, XMP) transfers where ICO supports it; otherwise it is dropped. If the CR2 contained an alpha channel and ICO does not support transparency, the background is flattened to white by default.
Tips for Best Results
- When uploading to Retina / high-DPI contexts, render the ICO at 2× the CSS pixel size; the crispness gap over 1× is noticeable on modern screens.
- Strip EXIF metadata from the ICO before publishing if the CR2 came from a phone camera — it often contains GPS coordinates and device IDs.
- If the CR2 is a screenshot of text or UI, prefer a lossless ICO target to avoid the JPEG-style ringing around glyph edges.
Frequently Asked Questions
Frequently Asked Questions
It depends on the codecs involved. If both CR2 and ICO are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If ICO is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded CR2 exactly, but cannot recover detail that CR2 had already compressed away.
Often yes, especially when ICO is lossless. CR2 tuned for efficient web delivery will usually produce smaller files than ICO's default settings. If file size matters, drop the quality in Advanced or pick a more compressed target format instead.
KaijuConverter uploads over HTTPS, processes the image in an isolated container and deletes both the source and the output within two hours. No account is required, file contents are never logged, and we do not use uploads to train any model. For confidential material, the paid plan includes a data-processing agreement.
Related comparisons
See these formats side by side to understand which fits your use case best.
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Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.