RembgExporter

RembgExporter is a desktop app that removes backgrounds from images using AI and converts them into the format you need — Windows icons, web favicons, app store assets, or common image formats like PNG, WebP and JPG.

It works on Windows, Linux and macOS, it's free and open source.

Processing Modes

🔧 1. Convert ICO — Full pipeline for Windows icons

Combines three operations in a pipeline:

AI background removal — powered by rembg
Crop to square — Centers the image on a transparent background
Multi-resolution ICO conversion — powered by ImageMagick

Available AI models (selectable from the GUI):

Model	Characteristics
`birefnet-general`	Most precise, sharp edges — recommended
`birefnet-general-lite`	Fast, slightly lower quality
`isnet-general-use`	Robust alternative for complex objects
`u2net`	Fast, ideal for large batches
`u2net_human_seg`	Optimized for human subjects
`isnet-anime`	For illustrations, cartoons and anime

Models are downloaded automatically on first use to ~/.u2net/ and then reused from local cache. No internet connection required for subsequent uses.

Generated output:

filename_nobg.png        # PNG with transparent background (if background removal is active)
filename.ico             # Multi-resolution icon 16 · 24 · 32 · 48 · 64 · 128 · 256 px

🌐 2. Favicon Generator — Complete favicon for websites

Generates a complete favicon package for modern websites and PWAs. Optionally supports AI background removal and crop to square.

Generated files:

favicon.ico              # Multi-frame icon (7 resolutions)
favicon.png              # 32×32 for modern browsers
favicon-192.png          # 192×192 for Android
favicon-512.png          # 512×512 for iOS
manifest.json            # PWA manifest with icon references

Usage: Copy files to the website root and add to <head>:

<link rel="icon" href="/favicon.ico">
<link rel="manifest" href="/manifest.json">

Supports PNG, JPG and SVG images. SVG is automatically rendered to 512×512.

📱 3. App Store Icons — Optimized icons for app stores

Generates icons with exact dimensions for the main app stores. Optionally supports AI background removal and crop to square.

Google Play Store:

play_store_512.png       # 512×512 main icon

Apple App Store:

app_store_1024.png       # 1024×1024 main icon
iphone_180.png           # 180×180 iPhone
ipad_pro_167.png         # 167×167 iPad Pro
ipad_152.png             # 152×152 iPad standard

Microsoft Store:

tile_150.png             # 150×150 standard tile
tile_70.png              # 70×70 small tile

Select the store from the dropdown menu. Images are automatically resized and optimized.

🎨 4. Format Conversion — Batch conversion between formats

Converts images between formats with quality control. Optionally supports AI background removal and crop to square before conversion.

Supported formats:

PNG (lossless)
JPG (lossy, quality 1-100) — white background if background removal is active
WebP (modern, quality 1-100)
GIF

Quality control: Slider 1-100 (for JPG and WebP)

Generated output:

filename.png / .jpg / .webp / .gif    # In the selected format

Supports batch processing: load multiple files at once.

Available Operations

The operations in the Operations section adapt to the selected mode:

Operation	ICO	Favicon	App Store	Format
1. Remove background (AI)	✅	✅	✅	✅
2. Crop to square	✅	✅	✅	—
3. Output	ICO/PNG checkbox	fixed info	fixed info	dynamic info

In non-ICO modes, operation 3 shows an informational label about the fixed or selected output.

Using the App

Main interface

The interface is divided into three panels:

Left sidebar — Image list: add, remove single files or clear all. Click a file to select it and update the preview
Center panel — All options: mode, operations, destination, start and log
Right sidebar (Preview) — Shows in real time the original image and the expected result based on current settings:
- If the image is non-square and "Crop to square" is active: shows the applied transparent padding
- If the image is non-square and "Crop to square" is inactive (in ICO/Favicon/AppStore mode): shows the distorted result with ⚠ warning
- The preview automatically adapts to window resizing

Workflow:

Add files with the "+ Add" button (PNG, JPG, SVG, BMP, WebP, GIF)
Choose the mode in the "Mode" section
Configure operations (background removal, AI model, crop)
Choose the output destination (same folder or custom)
Start with the "PROCESS" button
Monitor progress in the progress bar and log

Language

The app supports English and Italian. Use the IT | EN toggle in the top-left of the image sidebar to switch language.

Tooltips

All buttons, checkboxes and menus show a descriptive tooltip on mouse hover (500ms delay).

Project structure

rembgexporter/
├── requirements.txt
├── start.bat                       # Launch shortcut (generated by scripts\setup.bat)
│
├── scripts/
│   ├── setup.bat                   # Creates venv, installs deps, generates start.bat
│   ├── build.bat                   # Builds exe with PyInstaller
│   └── version_info.txt            # Windows metadata (author, version, copyright)
│
├── src/
│   ├── main.py                     # Entry point
│   ├── ui/
│   │   └── app.py                  # GUI interface (PySide6)
│   ├── core/
│   │   └── core.py                 # Image processing pipeline
│   ├── utils/
│   │   └── path_utils.py           # resource_path() for dev and PyInstaller
│   ├── assets/
│   │   └── RembgExporter.ico
│   └── third-party/
│       └── imagemagick/            # ImageMagick 7.1.2 portable
│           └── magick.exe
│
├── tests/
├── venv/                           # Virtual environment (created by setup.bat)
└── dist/                           # Portable exe (generated by build.bat)

Installation

git clone https://github.com/zoott28354/rembgexporter.git
cd rembgexporter
scripts\setup.bat

scripts\setup.bat creates the virtual environment, installs all dependencies and generates start.bat.

Requirements: Python 3.10+ installed on the system.

Windows: ImageMagick is already included (src/third-party/imagemagick/magick.exe) — no additional download required.

Linux: Install ImageMagick via sudo apt install imagemagick.

macOS: Install ImageMagick via brew install imagemagick.

Launch

Windows:

start.bat

Starts the app using pythonw.exe — no CMD window. Generated automatically by scripts\setup.bat.

Linux / macOS:

python3 src/main.py

Build portable exe

scripts\build.bat

Generates dist\RembgExporter_V<version>.exe via PyInstaller — single executable, no installation required. The version is read automatically from scripts\version_info.txt (e.g. RembgExporter_V1.0.0.exe).

Included in the distribution:

✅ All Python dependencies (rembg, Pillow, PySide6, svglib, reportlab, etc.)
✅ ImageMagick 7.1.2 (for perfect ICO creation)
✅ Windows metadata (author, copyright, GitHub URL visible in Properties → Details)

Not included (downloaded on first use):

rembg AI models: downloaded to ~/.u2net/ on first use on each machine

Data and storage

The app does not save any configuration file — all settings reset to default on each launch.

What	Where	Notes
AI models (rembg)	`~/.u2net/`	Downloaded automatically on first use per model, then reused from cache. Safe to delete to free disk space (~100–200 MB per model).
Output files	Same folder as source or custom folder	Chosen in the "Output destination" section before processing.
Virtual environment	`venv/` in project root	Created by `scripts\setup.bat`. Can be deleted and recreated at any time.
PyInstaller cache	`build/` in project root	Temporary build folder, safe to delete after building.

Model cache path by OS:

Windows: C:\Users\<name>\.u2net\

Linux/macOS: ~/.u2net/

Main dependencies

Python (pip)

Package	Role
`rembg`	AI background removal
`Pillow`	Image manipulation
`onnxruntime`	AI model execution (CPU)
`PySide6`	Cross-platform GUI (LGPL)
`svglib` + `reportlab`	SVG to PNG rendering
`pyinstaller`	Portable exe build

External (included in distribution)

Tool	Role	Version
ImageMagick	Multi-frame ICO creation, favicon, app store icons, format conversion	7.1.2-Q16-HDRI

Technologies used

Technology	Usage
Python 3.10+	Main language
PySide6	Cross-platform GUI with dark theme (LGPL)
rembg	AI background removal (deep neural networks)
Pillow (PIL)	Image manipulation and color profiles
ImageMagick CLI	Batch processing, multi-frame ICO creation, format conversion
svglib + reportlab	SVG → PNG rendering
ONNX Runtime	Accelerated AI model execution (CPU)
PyInstaller	Portable exe packaging

Usage examples

Example 1: Create a Windows icon from a PNG logo

1. Add logo.png
2. Choose "Convert ICO"
3. Select AI model (birefnet-general recommended)
4. ✅ Enable background removal and crop to square
5. Click "PROCESS"

Output: logo_nobg.png, logo.ico (7 resolutions: 16→256px)

Example 2: Create favicon for a website

1. Add logo_square.png (at least 512×512)
2. Choose "Favicon Generator"
3. Click "PROCESS"

Output: favicon.ico, favicon.png, favicon-192.png, favicon-512.png, manifest.json

Example 3: Prepare icons for Apple App Store

1. Add app_icon.png (1024×1024 minimum)
2. Choose "App Store Icons"
3. Select "Apple App Store" from the menu
4. Click "PROCESS"

Output: app_store_1024.png, iphone_180.png, ipad_pro_167.png, ipad_152.png

Example 4: Convert photo to WebP with background removed

1. Add photo.jpg
2. Choose "Format Conversion"
3. Select format "WebP", quality 80
4. ✅ Enable background removal
5. Click "PROCESS"

Output: photo.webp with transparent background

Name		Name	Last commit message	Last commit date
Latest commit History 73 Commits
scripts		scripts
src		src
tests		tests
.gitignore		.gitignore
CLAUDE.md		CLAUDE.md
LICENSE		LICENSE
README.md		README.md
requirements.txt		requirements.txt

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Repository files navigation

RembgExporter

Processing Modes

🔧 1. Convert ICO — Full pipeline for Windows icons

🌐 2. Favicon Generator — Complete favicon for websites

📱 3. App Store Icons — Optimized icons for app stores

🎨 4. Format Conversion — Batch conversion between formats

Available Operations

Using the App

Main interface

Language

Tooltips

Project structure

Installation

Launch

Build portable exe

Data and storage

Main dependencies

Python (pip)

External (included in distribution)

Technologies used

Usage examples

Example 1: Create a Windows icon from a PNG logo

Example 2: Create favicon for a website

Example 3: Prepare icons for Apple App Store

Example 4: Convert photo to WebP with background removed

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RembgExporter

Processing Modes

🔧 1. Convert ICO — Full pipeline for Windows icons

🌐 2. Favicon Generator — Complete favicon for websites

📱 3. App Store Icons — Optimized icons for app stores

🎨 4. Format Conversion — Batch conversion between formats

Available Operations

Using the App

Main interface

Language

Tooltips

Project structure

Installation

Launch

Build portable exe

Data and storage

Main dependencies

Python (pip)

External (included in distribution)

Technologies used

Usage examples

Example 1: Create a Windows icon from a PNG logo

Example 2: Create favicon for a website

Example 3: Prepare icons for Apple App Store

Example 4: Convert photo to WebP with background removed

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