Image Size Converter

The image size converter accepts original_width_px and original_height_px in pixels and optional bounding constraints to compute a resized dimension that meets platform limits. It is designed for designers, developers, and content teams who need predictable image sizes for websites, apps, or social media, reducing trial-and-error resizing and enabling consistent asset generation.
Conceptually the tool treats the image as a rectangle inside a bounding area. If preserve_aspect_ratio is enabled, a single scale factor is computed and applied to both dimensions. In contain mode, the image fits inside the bounds; in cover mode, it fills the bounds which may crop edges. The algorithm supports upscaling or only downscaling depending on settings.
Key differentiators include explicit handling of bounds, optional fit modes, and exact final dimensions and scale percentages, enabling reproducible workflows and scriptable asset pipelines. Outputs are dimension-centric and ready for downstream encoding, compression, or format conversion. Use cases span web assets, app icons, thumbnails, and marketing visuals where consistent pixel dimensions and predictable output are essential.
The tool does not perform image encoding or color conversion; it focuses on geometry. Outputs are ready for downstream processing in image pipelines or asset-generation scripts, allowing repeatable resizing across projects. This helps maintain brand consistency and reduces the risk of under- or over-sizing assets during production.