SZ Icon Editor - Free Online ICO and Cursor File Editor

Create, edit, and manage multi-image ICO and CUR files with pixel-level drawing tools, alpha channel support, color depth quantization with dithering, image transformations, and icon extraction from Windows EXE and DLL executables.

Features

• Multi-image ICO/CUR editing with support for 1-bit through 32-bit RGBA at all standard sizes (16x16 to 256x256)
• Pixel drawing tools: pencil, eraser, eyedropper, flood fill, line, rectangle, ellipse, and selection
• Image transformations: flip, rotate, resize, shift/offset, grayscale, invert, hue/saturation, and color replace
• Quantization and dithering with multiple algorithms and visual preview for color depth reduction
• Extract icons from Windows PE executables (EXE/DLL) with resource group browsing and batch export
• Import from PNG, BMP, SVG, JPG, and GIF with automatic multi-size icon generation
• Export favicon files with selectable sizes and clipboard cut/copy/paste support
• Full undo/redo history (30 steps) with keyboard shortcuts for all operations