TinyIcon

A tiny windows icon file (.ico) creator.

Define your wanted resolutions, import image, save. Done!

See the Changelog for release notes.

Features

• Multi-resolution icons: pick the sub-images your .ico should contain from 8×8 up to 256×256
• Color depth: 1, 4, 8, 16, 24 and 32-bit entries, selectable independently per resolution
• Open an existing .ico and edit it further: every entry is read back, including palettized and PNG-compressed ones
• Add sub-images to an icon (Edit menu, right-click the left panel, or Ins): new entries are scaled from the largest existing one
• Delete sub-images (Edit menu, right-click a preview, or Del)
• Import a source image (.png, .bmp, .jpg, .gif, .tiff) that gets downscaled into every sub-image
• Drop a file on the window: an .ico is opened, any other image is imported
• Non-square sources are fitted and centered with transparent padding, so the aspect ratio is kept
• Full alpha transparency for 32-bit entries; all lower depths use a 1-bit mask
• Automatic encoding per sub-image: PNG for 256×256 32-bit entries, classic DIB/BMP for the rest
• Detail view with zoom (Ctrl +/-/*, or mouse wheel), pan (right mouse drag, right click recenters)
• Keyboard shortcuts for the whole workflow (see Keyboard Shortcuts)
• Remembers your window placement and the last resolution selection per color depth between runs

User Guide

1. Create or open an icon: File ▸ New Icon… lets you pick the resolutions for each color depth. File ▸ Open Icon… loads an existing .ico instead.
2. Import an image: File ▸ Import Image… scales your source image into every sub-image. You can also drop a file on the window.
3. Check the result: select a preview in the left panel to see it in the detail view on the right. Zoom with the mouse wheel and pan by dragging with the right mouse button.
4. Adjust the sub-images: add or delete entries from the Edit menu, the right-click menu in the left panel, or the keyboard.
5. Save: File ▸ Save Icon… writes the .ico.

Keyboard Shortcuts

Shortcut	Action
Ctrl+N	Create a new icon and choose its sub-images
Ctrl+O	Open an existing .ico file
Ctrl+I	Import a source image into all sub-images
Ctrl+S	Save the icon
Ins	Add sub-images to the current icon
Del	Delete the selected sub-image
Ctrl++	Zoom in on the detail view
Ctrl+-	Zoom out of the detail view
Ctrl+*	Reset the zoom to 100%

Build

From the command line

Prerequisites:

• .NET SDK 10.0 - install from https://dotnet.microsoft.com/

Build and run:

1. Build:

   dotnet build
   

2. Test (optional):

   dotnet test
   

3. Run:

   dotnet run --project Source\TinyIcon\TinyIcon.csproj
   

From Visual Studio 2026

Prerequisites:

• .Net Desktop development workload
• .Net 10.0 Runtime
• .Net SDK

Just open TinyIcon.slnx build and run.

Dependencies

• CommunityToolkit.Mvvm
• Microsoft.Xaml.Behaviors.Wpf

References

• Icons created from Fluent System Icons