SIC! — Simple Image Converter

An accessible image format converter for Windows. Batch-convert images between JPG, PNG, WebP, ICO, BMP, TIFF, GIF, and AVIF with optional resizing. Works as both a GUI app and a command-line tool.

Built with accessibility in mind — screen-reader friendly with proper labels and tab order — but designed to look and feel like a proper app for sighted users too.

Features

• Batch conversion — queue multiple images and convert them all at once
• 8 formats — JPG, PNG, WebP, ICO, BMP, TIFF, GIF, AVIF
• Resize — specify target dimensions (useful when you're told "upload a 128x128 photo")
• Multiple input methods — file dialog, drag & drop, Ctrl+V paste (files or screenshots), download by link
• Filename conflict handling — always asks: overwrite, rename (_1 suffix), or skip
• CLI mode — headless conversion from the command line, no UI needed
• Accessible — logical tab order, keyboard shortcuts, screen-reader friendly

Requirements

• Windows 10/11 (x64)
• .NET 8.0 Runtime

Installation

Download the latest release from GitHub Releases or the official Oire Software website. Alternatively, build from source:

git clone https://github.com/Oire/sic.git
cd sic
dotnet build

For a single-file executable:

dotnet publish -c Release

Usage

GUI

Launch the app without arguments to open the graphical interface:

1. Add images using the Add File button, drag & drop, or Ctrl+V
2. Select a target format from the dropdown
3. Optionally check Resize and enter target dimensions
4. Click Convert

Converted files are saved next to the originals by default. Change this in Settings.

Command Line

sic -i input.png -o output.jpg
sic -i photo.bmp -o photo.webp
sic -i avatar.png -o avatar.ico -r 128x128

Option	Short	Required	Description
--input	-i	Yes	Path to the source image
--output	-o	No*	Path for the converted image (format inferred from extension)
--format	-f	No*	Target format (e.g. jpg, png, webp). Used when --output is omitted
--resize	-r	No	Target dimensions as WxH, Wx, or xH (e.g. 128x128, 128x, x128)
--crop	-c	No	Crop mode: scale to cover, then center-crop to exact dimensions

* Either --output or --format must be specified.

Configuration

Settings are stored in %APPDATA%/Oire/Sic/Sic.cfg:

• Output folder — where converted files are saved (default: same folder as source)
• Language — UI language (default: system language)

Building

Requires .NET 8.0 SDK.

dotnet build              # Debug build (x64)
dotnet build -c Release   # Release build
dotnet publish -c Release # Single-file executable

Building the Installer

The installer/ directory contains an Inno Setup script that builds a Windows installer with automatic .NET 8 Desktop Runtime detection and installation.

Quick start

Double-click installer/build-installer.bat — it builds the app in Release mode and compiles the installer.

PowerShell options

.\installer\build-installer.ps1                  # Build app + installer
.\installer\build-installer.ps1 -SkipBuild       # Installer only (use existing binaries)
.\installer\build-installer.ps1 -OpenOutput      # Open output folder when done
.\installer\build-installer.ps1 -InnoSetupPath "C:\Path\To\ISCC.exe"  # Custom compiler path

The installer is created in installer/Output/ as SIC!-V{version}-Setup.exe.

What the installer includes

• Sic.exe (single-file executable)
• Magick.Native-Q16-x64.dll
• help/ (user manual, per language)
• locale/ (translation .mo files)

User data (%APPDATA%\Oire\Sic) is not bundled — it is created at runtime. On uninstall, the user is offered the option to remove it.

Project Structure

src/Sic/
  Program.cs                      # Entry point (GUI or CLI dispatch)
  MainWindow.cs/.Designer.cs      # Main application window
  SettingsDialog.cs/.Designer.cs  # Settings form
  AboutDialog.cs/.Designer.cs    # About dialog
  AddUrlDialog.cs/.Designer.cs   # Add image by link dialog
  AddFolderDialog.cs/.Designer.cs # Add images from folder dialog
  IcoPresetDialog.cs/.Designer.cs # Multi-size ICO preset picker
  AddSizeDialog.cs/.Designer.cs   # Custom ICO size entry dialog
  ProgressDialog.cs/.Designer.cs  # Progress dialog for batch operations
  Models/
    ImageItem.cs                  # Image queue item data model
    ResizeMode.cs                 # Resize mode enum (KeepProportions, Crop)
  Services/
    ImageConverter.cs             # Magick.NET conversion engine
  Utils/
    Config.cs                     # SharpConfig-based settings
    FileHelper.cs                 # Cloud placeholder detection, file enumeration
    Localization.cs               # GetText.NET wrapper
    Constants/
      App.cs                      # App metadata and paths
      ExitCode.cs                 # CLI exit code constants
      Logging.cs                  # Log file paths and templates

License

Copyright 2026 Oire Software SARL. Licensed under the Apache License 2.0.