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 and crop — specify target dimensions with two modes: keep proportions or crop to exact size
• Multi-size ICO — create .ico files with multiple embedded sizes using built-in presets or custom dimensions
• Multiple input methods — file dialog, folder import, drag & drop, Ctrl+V paste (files, screenshots, or URLs), download by link
• Filename conflict handling — always asks: overwrite, rename (_1 suffix), or skip
• Cloud file detection — warns about OneDrive/SharePoint placeholder files that haven't been downloaded yet
• CLI mode — headless conversion from the command line, no UI needed
• Automatic updates — checks for new versions in the background with Ed25519 signature verification
• Portable mode — place an empty userdata folder next to Sic.exe to keep all data alongside the executable
• Localized — English, German, French, Russian, Ukrainian
• 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 File > Add Image, drag & drop, or Ctrl+V
2. Select a target format from the dropdown
3. Optionally check Resize and enter target dimensions
4. Click Convert Selected or Convert All

Converted files are saved to %APPDATA%\Oire\Sic\Converted\ by default (or userdata\Converted\ in portable mode). Change this in Settings.

Keyboard Shortcuts

Shortcut	Action
Ctrl+N	Add image
Ctrl+Shift+N	Add folder
Ctrl+L	Add image by link
Ctrl+V	Paste (files, screenshots, or URLs)
Delete	Remove selected image
Ctrl+Shift+Delete	Remove all images
F5	Convert selected
Ctrl+Shift+F5	Convert all
Ctrl+Alt+F5	Create multi-size ICO
Ctrl+,	Settings
F1	Open user manual
Ctrl+Shift+D	Donate
Shift+F1	About
Escape	Close the application

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 (or userdata\Sic.cfg in portable mode):

• Output folder — where converted files are saved (default: Converted subfolder in the data directory)
• Language — UI language (default: system language)
• Confirm exit — warn when closing with images still in the queue (default: enabled)

Portable Mode

To run SIC! in portable mode, create an empty userdata folder next to Sic.exe. When this folder is present, all application data — configuration, converted images, and logs — is stored there instead of in %APPDATA%. This is useful for running from a USB drive or keeping everything self-contained.

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 + portable ZIP
.\installer\Build-Installer.ps1 -Appcast               # Also generate signed appcast
.\installer\Build-Installer.ps1 -Appcast -Deploy       # Build everything and deploy via SCP
.\installer\Build-Installer.ps1 -NoPortable            # Skip portable ZIP (e.g., for beta releases)
.\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 Inno Setup path

Output files are created in installer/Output/:

• sic-v{version}-setup.exe — Windows installer
• sic-v{version}-portable.zip — portable archive with userdata/ folder (unless -NoPortable)
• appcast.xml and appcast.xml.signature — auto-update manifest (if -Appcast)

The portable ZIP is compressed with 7-Zip if available (auto-detected), otherwise falls back to built-in compression with a warning.

Deploying

The -Deploy switch uploads release files to the hosting server via SCP. It reads connection details from installer/deploy.json (gitignored). Copy installer/deploy.example.json and fill in your SSH host alias and remote path to get started.

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.