Improve ImgSLI is a tool designed for comparing two images side-by-side, featuring a synchronized magnifying glass to inspect details closely.
It’s built for anyone needing detailed image comparison, analysis, or manipulation, such as designers, upscale enthusiasts, photographers, or researchers.
This is free and open source software.
Features include:
- Core Comparison & Viewing:
- Intuitive image splitting (horizontal/vertical) controlled by mouse.
- Save the current comparison view as a full-resolution image.
- Magnifier Tool:
- Powerful Magnifier for close inspection.
- Adjustable magnification area size and magnifier display size.
- Independent magnifier movement using WASD keys.
- Adjust distance between magnifiers using Q and E keys.
- Option to combine magnifiers for direct comparison of magnified areas.
- Freeze the magnifier’s view position.
- File & Workflow Management:
- Drag-and-drop support for loading one or multiple images per panel.
- Select loaded images via dropdown menus when multiple images are loaded into a panel.
- Swap entire image lists between panels with a single button click.
- Edit image names directly within the application interface.
- Option to include file names in the saved comparison image.
- Customizable font size and color for included file names.
- Adjustable maximum length for displayed file names with visual warnings.
- User Experience & Interface:
- Multilingual support (English, Russian, Chinese) with flag-based language selection.
- Dynamic window resizing with adaptive content rendering.
- Persistent settings for window state, language, and various display preferences across sessions.
Website: github.com/Loganavter/Improve-ImgSLI
Support:
Developer: Loganavter
License: MIT License

Improve ImgSLI is written in Python. Learn Python with our recommended free books and free tutorials.
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