CR3 to ICO Converter

Turn a Canon CR3 Into a Windows Icon: What This Covers

This tutorial takes a Canon .cr3 raw photograph and produces a Windows .ico icon file — the format used for desktop shortcuts, application icons, and classic browser favicons. The two formats sit at opposite extremes: a CR3 is 20-45+ megapixels of unprocessed sensor data, while a single ICO image tops out at 256 x 256 pixels. Everything below is about controlling that enormous downscale so the result still reads as something at icon size.

How to Convert CR3 to ICO

1. Upload Your CR3 File: Drag and drop your .cr3 onto the page or click "+ Add Files" to browse. You can queue several raw photos and convert them all with the same setting.
2. Pick a Preset Under Image Resolution: This page exposes exactly one control — Image resolution, and only its Preset dropdown: 256, 192, 180, 128, 64, 48, 32, 24, or 16 pixels. The other resolution modes — percentage, keep original, and custom width or height — do not appear for ICO output.
3. Match the Preset to Where the Icon Will Be Used: 16, 32, and 48 are the classic Windows shell and favicon sizes; 256 is the largest a single ICO image can hold.
4. Convert and Download: Click "Convert" and save the .ico. Files are uploaded over an encrypted connection, converted on our servers, and deleted automatically after a few hours. No sign-up, no watermark.

Walk-through: Why the Preset Sets the Height, Not the Box

The preset you pick sets the output height; the width follows your photo's aspect ratio. A CR3 from a 3:2 Canon body at the 256 preset therefore renders 256 pixels tall and wider than that, not a 256 x 256 square. That matters more than it would in any other format, because an ICO directory entry stores each image's width and height in a single byte apiece — which is why 256 is the ceiling and why a wide crop at the largest preset is asking for something the header cannot express. In practice:

• If you want a conventional square icon, crop the photo to 1:1 first. Crop Image accepts .cr3 directly and can write ICO as its output format, so you can square the frame and produce the icon in one pass.
• If you are making a favicon, 32 is the safest single size and 16 is what a browser tab actually renders; both are so small that only a bold, high-contrast crop survives. Zoom into one subject rather than using the full frame.
• If you need a large installer or Explorer icon, use 256. Windows Vista was the release that made 256 x 256 icons practical by adding support for PNG-compressed frames inside the ICO container.
• If you want several sizes, run the conversion once per preset. This tool writes one image per .ico file; the format itself can hold many, but combining them is a separate packaging step.

CR3 and ICO Compared

Which Preset to Pick

Frequently Asked Questions

What icon size should I pick for a favicon?

If you generate only one, use 32 — it is the size most browsers request first, and it downsamples acceptably to the 16-pixel tab rendering. Generate 16 as well if the artwork has fine detail that muddles when the browser scales it. 48 and 256 matter for Windows shortcuts and installers rather than for the web.

Why is my icon wider than it is tall?

Because the preset sets the height and the width is derived from your photo's aspect ratio. A 3:2 Canon frame at the 256 preset comes out 256 pixels tall and proportionally wider. Icons are conventionally square, and cropping is the only way to get a square result from a rectangular photo without stretching it — Crop Image takes .cr3 input and offers ICO as an output format, so a square crop and the icon can happen in the same step.

Why does my photo look unrecognisable at 32 x 32?

A 24-megapixel frame is roughly 6000 x 4000 pixels. At 32 pixels tall you are keeping about one pixel in every 125 across, so faces, text, and texture collapse into a smear of colour. Icons work from bold shapes and strong contrast, not from photographic detail. Crop tightly to a single high-contrast subject before converting, or accept that only the overall colour survives.

Why are there no quality, colour, or bit-depth settings on this page?

Because none of them apply to ICO output. The Image Compression group — quality preset and file-size targeting — is hidden for ICO, as is the Colors palette control (which appears for GIF output, and for PNG at the highest quality preset) and the Bit Depth control (PPM output only). Resolution is the only thing left that meaningfully changes an icon, so it is the only control the page renders.

Can one ICO file hold several sizes?

The format can: an ICO begins with an ICONDIR structure followed by one ICONDIRENTRY per stored image, which is how a single favicon file serves crisp 16, 32, and 48 pixel renderings. This converter writes one image per file, so run it once per preset if you need several sizes and combine them with a dedicated icon packer afterwards.

Does the ICO keep any transparency?

There is nothing to keep. A CR3 is sensor data for a solid rectangular frame with no alpha channel, so the icon is fully opaque edge to edge. ICO itself supports transparency — through the AND mask on paletted frames or a full alpha channel on 32-bit BGRA frames — but you need a source that already has transparency, such as a logo exported as PNG, to make use of it.

Will my Lightroom or Digital Photo Professional edits show up in the icon?

No. The .cr3 on disk holds unprocessed sensor data plus the develop settings your editor stores separately; converting it here renders the raw with a baseline interpretation instead of your adjustments. If a specific look matters at icon size, export a finished JPG or PNG from your raw editor and convert that image to ICO instead.

What happens to my CR3 after the conversion?

It is uploaded over an encrypted connection, converted on our servers, and deleted automatically after a few hours — never shared, never made public, no sign-up and no watermark. In our pipeline the icon is written with ImageMagick and the requested size is clamped to 256 pixels, the largest value an ICO directory entry can express, before the file is written. If you want the photograph itself rather than an icon, CR3 to PNG keeps it viewable at full resolution.