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CR3 to ICO Converter

Convert CR3 to ICO online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

  • Free to use
  • No file stored beyond 1 hour
  • Encrypted over TLS 1.2/1.3
  • No watermarks

Drag and drop your files here or click to upload.

Maximum file size is 1GB

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How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

  1. 01

    Upload your file

    Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

  2. 02

    Choose an output format

    Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

  3. 03

    Convert & download

    Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

CR3 to ICO

Why convert CR3 to ICO?

CR3 is a RAW camera format, while ICO is a lossless format. ICO can have a transparent background, CR3 can't.

  • Where ICO works best

    Website favicons and Windows icons.

CR3 vs ICO: what's the difference?

PropertyCR3ICO
TypeImageImage
CompressionRAW sensor dataLossless (no quality loss)
Transparent backgroundNoYes
AnimationNoNo
Opens inRAW editors such as Lightroom, Photoshop or Canon's own softwareBrowsers as a site icon; Windows as an app icon
Best forStraight-from-camera photos for editingWebsite favicons and Windows icons

What is a CR3 file?

Canon Raw 3

Developed By
Canon Inc.
Initial Release
2018
MIME Type
image/x-canon-cr3

The CR3 format is the third-generation raw image container developed by Canon Inc., introduced in 2018 with the EOS M50. It utilizes the ISO Base Media File Format (ISO/IEC 14496-12), replacing the TIFF-based structure of its predecessor, CR2. CR3 files store unprocessed sensor data and support C-RAW (Compact RAW) compression, which reduces file size by approximately 40% compared to standard RAW without significant degradation in dynamic range. The format encapsulates distinct metadata tags, EXIF data, and a full-resolution JPEG preview within a CIFF (Camera Image File Format) hierarchy.

How to open a CR3 file

Windows and macOS require the installation of the Canon RAW Codec or specific OS-level extensions (such as the Microsoft Raw Image Extension) to view CR3 thumbnails natively. For editing and full processing, Canon provides the Digital Photo Professional (DPP) software. Third-party post-production suites like Adobe Lightroom Classic (version 8.0+), Capture One, and DxO PhotoLab offer comprehensive support for CR3 demosaicing and color grading.

What is an ICO file?

Microsoft Icon File

Developed By
Microsoft
Initial Release
1985
MIME Type
image/vnd.microsoft.icon

The ICO format is an image container specifically designed for Microsoft Windows to store icons for executable files, folders, and applications. Introduced with Windows 1.0, it can encapsulate multiple raster images of varying dimensions and color depths (specifically BMP or PNG frames) within a single file to support dynamic scaling across different display resolutions. The structure comprises an ICONDIR header referencing one or more ICONDIRENTRY directory entries, allowing the operating system to select the appropriate 16x16, 32x32, or 48x48 pixel resource based on the current UI scaling settings.

How to open an ICO file

ICO files are natively supported by the Microsoft Windows operating system, which automatically renders them in the File Explorer and taskbar. On macOS, Apple Preview handles the format natively. For editing or detailed inspection of the contained bitmap layers, raster graphics editors such as GIMP, Adobe Photoshop (via plugin), or Paint.NET are required. Web browsers also natively render ICO files when they are designated as favicons.

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

  • Convert CR3 to ICO in seconds

    Every CR3 to ICO conversion runs on our servers, so your device stays fast and the output quality stays intact.

  • Fast, cloud-powered

    No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

  • Secure & private

    Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

  • Free - no account needed

    Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert CR3 to ICO via API

Automate CR3 to ICO conversions in three steps: create a job, upload your file, then poll for the result.

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "cr3-to-ico",
    "tasks": {
      "upload-file": {
        "operation": "import/direct/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "input_format": "cr3",
        "output_format": "ico"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (upload_url of the upload-file task in the response)
curl -X PUT "$UPLOAD_URL&filename=input.cr3" --upload-file input.cr3

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

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