The 379K-line Kotlin argument for all-in-one Android image editing

What it does

ImageToolbox is a comprehensive Android image editor written in Kotlin and Jetpack Compose. It bundles basic operations like cropping and drawing with heavier features such as background removal, EXIF editing, PDF generation, OCR, and AI upscaling. The app targets API 24+ and presents everything through a Material You interface.

The interesting bit

The repository clocks in at roughly 379,000 lines of Kotlin, making it less a casual utility and more a stress test for Jetpack Compose at scale. Because the entire application is free and open source, it also serves as a rare, fully inspectable reference for building complex media UIs on Android.

Key highlights

• Ships via Google Play, F-Droid, and GitHub Releases
• Supports niche workflows: JXL and PSD handling, QR scanning, photo collages, and EXIF manipulation
• Uses Material You and Jetpack Compose, offering a real-world UI reference for Android developers
• The README mentions AI enhancement and background removal, though it does not clarify whether models run on-device or in the cloud

Caveats

• The README is heavy on download badges and donation links but light on architecture details, contribution guidelines, or technical documentation
• It is an end-user application, not a library; developers looking for reusable components will need to disassemble it themselves

Verdict

Worth exploring if you are an Android developer studying large Compose codebases, or a user who wants a free, feature-dense image editor. Skip it if you need a modular image-processing SDK to drop into your own project.