ICO to CR2 Converter
Convert ICO to CR2 in your browser. You download a Linear DNG (.dng), not a .cr2: only a Canon camera can create a genuine CR2, and every editor that opens CR2 also opens DNG. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
ICO expected · other image formats also work
How to use ICO to CR2
- 1
Add your ICO files: drop them here, choose them, or paste from the clipboard.
- 2
Pick the colour that replaces transparent areas, since DNG has none.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .dng files one at a time or together as a ZIP.
Why use Aback Images for ico to cr2
Where a CR2 would go
CR2 files are opened by Canon Digital Photo Professional, Lightroom, Photoshop Camera Raw, Capture One and darktable, and every one of them opens the DNG too.
DNG next to ICO
The DNG is written uncompressed, so expect it to be several times larger than the ICO, which stores each size stored as a headerless BMP or as a complete PNG.
Written without a lossy pass
The DNG is written uncompressed, so the pixels decoded from the ICO arrive unchanged.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
ICO vs CR2
What changes from ICO to CR2
Encoding: the ICO uses each size stored as a headerless BMP or as a complete PNG; CR2 uses lossless JPEG-compressed sensor data, cut into vertical slices, and the download is a Linear DNG: demosaiced 8-bit RGB with the colour matrices raw editors need.
Bit depth: 1 to 32 bits per pixel, set per size in the ICO; CR2 allows 12 or 14 bits per channel, and the DNG written here has 8 bits per channel, linearised.
Colour: RGB or a palette, per image in the ICO; CR2 supports camera RGB from a Bayer mosaic, with the Picture Style recorded in the maker notes, written here as 8-bit sRGB.
Transparency: the ICO stores it as 8-bit alpha in 32-bit and PNG entries, or a 1-bit mask in old icons; the DNG has none, so transparent areas are filled with the colour you choose.
Other images: the ICO can hold several sizes of the same picture, typically 16, 32, 48 and 256 px; only the main image is converted.
Metadata: the ICO can carry only a directory of the sizes inside, with no EXIF; CR2 can carry EXIF, Canon maker notes (Picture Style, lens, focus points) and the embedded previews, but nothing is copied across.
About ICO
ICO is a container that bundles several sizes of the same icon (16, 32, 48, 256 px) into one file. It is still the most compatible format for website favicons and Windows app icons.
An ICO starts with a 6-byte ICONDIR (type 1 for icons) and a 16-byte entry per image giving width, height, colour count and offset. Each image is either a BMP without its file header plus an AND mask, or a complete PNG.
ICO files usually come from website favicons, Windows programs and installers.
About CR2
CR2 is the raw format of Canon EOS cameras from 2004 until CR3 replaced it in 2018. It holds the sensor's 12 or 14-bit readings, losslessly compressed, plus a large JPEG preview rendered with the camera's Picture Style.
CR2 is TIFF-based: the TIFF header is followed by the letters 'CR' and version 2.0, then four image directories: a large JPEG preview with the EXIF block, a 160×120 thumbnail, a small uncompressed RGB image, and the sensor data as lossless JPEG cut into vertical slices.
CR2 files come from Canon EOS DSLRs made from 2004 to 2018, such as the 5D Mark II and III, 6D, 7D and the Rebel series.
When converting ICO to CR2 makes sense
Forms and workflows that ask for CR2 usually feed a raw editor, and each of those opens DNG as well, so the DNG can take the CR2's place. Keep the ICO if you only need to view or share the picture.
What CR2 offers when it comes straight from the camera: Large embedded JPEG rendered with the camera's Picture Style; Lossless 12 or 14-bit sensor data; Widely supported after fourteen years of Canon DSLRs. Its drawbacks: Replaced by CR3 in 2018, so current Canon bodies no longer write it; 20 to 50 MB per photo; Sliced lossless JPEG data that only raw decoders can read.
Limitations
- The largest image in the icon is the one converted; smaller sizes that were hand-tuned for 16 px are not carried over.
- The DNG holds the decoded 8-bit pixels, so it adds no dynamic range or detail beyond the ICO.
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Frequently asked questions
Why do I get a .dng file instead of a .cr2?
A real CR2 is written by Canon cameras and holds the sensor's own readings (12 or 14 bits per channel, stored as lossless JPEG-compressed sensor data, cut into vertical slices) along with EXIF, Canon maker notes (Picture Style, lens, focus points) and the embedded previews. An ICO holds no sensor data, so no software outside the camera can create a genuine CR2. The Linear DNG you get instead is Adobe's open raw format, and every editor that opens CR2 files opens it with the same raw controls. It holds decoded pixels, so it adds no quality or dynamic range.
Does converting ICO to CR2 lose quality?
DNG is written uncompressed, so the pixels are stored exactly as decoded. Not carried over: any several sizes of the same picture.
What happens to transparency when converting ICO to CR2?
ICO stores transparency as 8-bit alpha in 32-bit and PNG entries, or a 1-bit mask in old icons. DNG has no alpha channel, so transparent pixels are composited onto a solid colour, white unless you pick another. To keep transparency, convert to PNG, WebP or AVIF instead.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.