Intermediateandroidkotlinjetpack-composeimage-processingaiopen-sourcef-droidfiltersocrmaterial-design

ImageToolbox: Powerful Android Image Editor

Set up ImageToolbox, an open-source Android application with 361K+ lines of code offering over 310 filters, AI-powered tools, batch processing, and professional image manipulation capabilities.

Step 1
What is ImageToolbox?
ImageToolbox is a versatile, open-source image editing application for Android with over 12,945 GitHub stars. Built entirely in Kotlin with Jetpack Compose, it offers professional-grade image manipulation capabilities including batch processing, 310+ filters, AI-powered enhancements, OCR with 120+ language support, and advanced format conversion.
```
Key Features:
- 310+ filters (blur, sharpen, artistic, tone mapping)
- Filter chains and custom filter creation
- 95+ AI models (upscaling, background removal, denoise)
- OCR with 120+ languages
- PDF tools (merge, split, protect)
- Batch processing
- Watermarking & steganography
- 50+ resampling algorithms
```

Step 2

Technology stack

ImageToolbox is built with modern Android development technologies:

Core: Kotlin 100% (361K+ LOC), Min SDK 24, Apache 2.0
UI: Jetpack Compose, Material 3, Decompose BLoC
Image Processing: GPUImage, OpenCV, Aire, Trickle
AI/ML: ONNX Runtime, U2Net, BiRefNet, YOLO
Architecture: Hilt DI, Coroutines, Flow, DataStore

Step 3

Download

Get ImageToolbox from official sources:

# GitHub Releases (all architectures)
curl -L -o ImageToolbox.apk "https://github.com/T8RIN/ImageToolbox/releases/latest/download/imageresizer-arm64-v8a-release.apk"
adb install ImageToolbox.apk

# F-Droid
flatpak install flathub org.fdroid.fdroid
# Search: "Image Toolbox"

# Package ID: ru.tech.imageresizershrinker

Step 4

Build from source

Set up development environment and build:

# Clone repository
git clone https://github.com/T8RIN/ImageToolbox.git
cd ImageToolbox
git lfs pull  # Pull models/resources

# Build debug APK
./gradlew assembleDebug
dbgs ./app/build/outputs/apk/debug/app-debug.apk

# Build release (requires signing)
./gradlew assembleRelease

# Architecture-specific
./gradlew assembleArmv7Release  # 32-bit ARM
./gradlew assembleArm64Release  # 64-bit ARM

Step 5

FOSS vs Market editions

Two editions available with different backend implementations:

Feature              | FOSS     | Market
QR Scanner            | Zxing    | ML Kit
Background Removal    | ONNX     | ML Kit
Document Scanner      | OpenCV   | ML Kit
Analytics             | No       | Yes
Crashlytics           | No       | Yes
Google Dependencies   | None     | Included

Step 6

Filters (310+)

Comprehensive filter system with categorized effects:

Basic: Saturation, Contrast, Brightness, Sharpen
Artistic: Sketch, Toon, Oil, Crystallize, Low Poly
Blurs: Gaussian, Motion, Zoom, Ring, Median, Poisson
Distortions: Swirl, Bulge, Kaleidoscope, Mirror
Color: Sepia, Inversion, Solarize, False Color
Special: Glitch, VHS, Pixelation, ASCII Art
Advanced: Tone Mapping, CLAHE, LUT (.cube files)

Step 7

AI Tools (95+ models)

Powered AI features for advanced manipulation:

Upscaling: Real-ESRGAN variants
Background Removal: U2Net, RMBG, BiRefNet, ISNet, YOLO
Enhancement: DeJPEG, DeNoise, Colorize, Enhance
Style Transfer: Anime-style filtering

Step 8

OCR & Document Scanning

Text recognition with Tesseract supporting 120+ languages:

Modes: Fast, Standard, Best
PSM (0-13): Page segmentation modes
OEM: LSTM-based recognition
Output: Text file, searchable PDF, EXIF embedding
Languages: EN, ES, FR, DE, CH, JA, KO, RU, AR, HI + 112 more

Step 9

Format Conversion

Support for 30+ image formats with advanced compression:

Modern: AVIF, JPEG XL, HEIF/HEIC
Traditional: JPEG, PNG, GIF, WEBP
Professional: TIFF, DNG, SVG, JP2
Specialized: ICO, QOI, APNG
Compression: MozJpeg, Jpegli, OxiPNG, ImageQuant

Step 10

PDF Tools

Complete PDF manipulation toolkit:

Conversion: PDF ↔ Images
Manipulation: Merge, Split, Rotate, Rearrange
Enhancement: Page numbers, Watermarks, Signatures
Security: Password protect/unlock
Content: Extract images, OCR, text extraction
Optimization: Compress, grayscale, repair

Step 11

Customization

Extensive UI theming options:

Theming: Material You, AMOLED, Light/Dark, Custom palette
Fonts: 25+ built-in + unlimited import (.ttf/.otf)
Switches: Material You, Pixel, Fluent, Cupertino, HyperOS
Shapes: Rounded, Oval, Heart, Kotlin Logo, Star
Icons: 41 palette format support

Step 12

Color Utilities

Professional color management:

Palettes: Material You extraction, 41 import/export formats
Operations: Picker, Gradients, Mixing, Harmonies
Harmonies: Complementary, Analogous, Triadic, Tetradic
Library: 33,000+ predefined colors

Step 13

Scaling Algorithms (50+)

High-quality resampling for image resizing:

Basic: Bilinear, Nearest, Cubic
High Quality: Lanczos 3/4/6, Spline, Kaiser
EWA: Lanczos 3, Hanning, Blackman (anisotropic)
Advanced: Ginseng, Lagrange, Haasn Soft
Color Spaces: sRGB, LAB, Oklab, Jzazbz

Step 14

Contribution

How to contribute to ImageToolbox:

# 1. Fork & clone
git clone https://github.com/YOUR_USERNAME/ImageToolbox.git

# 2. Add upstream
git remote add upstream https://github.com/T8RIN/ImageToolbox.git

# 3. Create branch
git checkout -b feature/your-feature

# 4. Build & test
./gradlew assembleDebug
adb install app/build/outputs/apk/debug/app-debug.apk

# 5. Translate (optional)
https://hosted.weblate.org/engage/image-resizer/

# 6. PR with conventional commits

Step 15

Security Verification

Verify APK authenticity with certificate hashes:

SHA-256: 20d7689de0874f00015ea3e31fa067c15c03457d362d41d5e793db3a864fa534
SHA-1:   d69eacb30eeae804e8b72d2384c3c616b1906785
MD5:     db6f6b76c503d31099e4754e676353cf

Verify: apksigner verify --print-certs ImageToolbox.apk

Step 16

Resources

Official links and community resources:

Source: https://github.com/T8RIN/ImageToolbox
Wiki: https://github.com/T8RIN/ImageToolbox/wiki
F-Droid: ru.tech.imageresizershrinker
Telegram: t.me/t8rin_imagetoolbox
Translation: https://hosted.weblate.org/engage/image-resizer/
Support: https://boosty.to/t8rin