Improve ImgSLI is a versatile open-source tool designed for detailed side-by-side image comparison. Easily spot differences and inspect fine details using its synchronized magnifying glass feature. Ideal for designers, photographers, AI art/upscaling enthusiasts, and anyone needing precise visual analysis.

Key features include:

• Compare images with an adjustable horizontal or vertical split line.
• Use the powerful synchronized magnifier with flexible controls: adjustable capture/display size, position control (mouse and WASD/QE keys), view freezing, and combined magnifiers.
• Load single or multiple images per comparison panel via drag-and-drop or file dialogs.
• Easily switch between loaded images using dropdown selectors.
• Save the complete comparison view (including split line, magnifier markers, and optional filenames) as a full-resolution image.
• Swap image lists between panels with a single click.
• Edit displayed file names directly within the interface.
• Multi-language interface (English, Russian, Chinese, Brazilian Portuguese) with persistent settings.
• Selectable interpolation methods for the magnifier (Nearest Neighbor, Bilinear, Bicubic, Lanczos).
• Quick preview of individual images using Space + Mouse Buttons.
• Improved performance with image caching.

The application is intuitive and distributed under the free MIT License.