Why does a wide logo get padding?

Each frame is a square. We contain-fit the image and leave empty pixels. Crop to 1:1 first if you want the logo to fill the tile.

Is this an old-style BMP ICO?

No. Frames are PNG inside the ICO container. That is what current browsers expect. Windows XP-era tools may fail.

Which sizes should I pick?

16, 32, and 48 cover most tabs and shortcuts. Add 256 if you want a large Explorer or desktop icon. You can uncheck any size.

Those four sizes only. One source image, 32 megapixels, 50 MB. We do not emit Apple Touch icons or a web manifest — those are separate PNGs.

Is Image to ICO private?

Everything runs locally in your browser. Your files are never uploaded to StackImage servers.

Do I need an account to use Image to ICO?

No. StackImage is free to use without signing up or creating an account.

Does Image to ICO work offline?

After the page and libraries load, processing happens on your device. A connection is only needed to load the app the first time (Enhance tools also need a one-time model download).

Image to ICO

Build a multi-size ICO from a PNG or JPG.

How it works

1Drop a PNG or JPG (square works best).
2Select 16, 32, 48, and/or 256.
3Download the .ico file.

About

Create an ICO from an image in the browser. Choose 16, 32, 48, and/or 256 px. Nothing is uploaded.

Each size is a PNG-compressed ICO frame, not a vintage BMP-only ICO. The source is contain-fit into a square (letterboxed, not cropped). Modern Windows and browsers read PNG ICO; very old shells may not.

Source caps: 32 megapixels, 50 MB. One file. Transparency survives if the source has alpha.

Common use cases

Generate a site favicon
Pack several sizes into one ICO
Convert a logo for a desktop shortcut
Turn a PNG mark into a Windows icon

What you actually get

One .ico with the sizes you ticked. Each frame is a square PNG. Empty margins stay transparent when the source has alpha.

This is not a full favicon package (no apple-touch-icon.png, no site.webmanifest).

ICO vs SVG to PNG

Start from SVG if you have a vector mark: rasterize at 1024, then build the ICO so small sizes have a clean source.

Starting from a 16px GIF will look soft at 256. Use a sharp original.

When not to use this tool

Skip it if you need BMP ICO for a legacy kiosk, or ICNS for macOS. Those are different containers.

Files above 32 megapixels are rejected. A 50 MB source is the other cap.

FAQ

Related tools

SVG to PNG

Rasterize an SVG at a chosen export size.

Convert Image

Convert JPG, PNG, WebP, AVIF, GIF, and HEIC locally.

Resize Image

Resize by pixels, percent, or presets like HD and Instagram.