Image Dimension Converter

The tool computes output image dimensions from a source image given target constraints. Users specify source width and height, desired target width and height, and a method such as fit, crop, or fill. It supports common outputs (PNG, JPG, WEBP) and allows quality control for lossy formats. The goal is to produce exact dimensions for web, mobile, or print while controlling aspect ratio and cropping behavior. Results include the final dimensions and suggested file size estimates under typical encoding settings.
The core logic includes three resize strategies. For fit, scale = min(target_w/orig_w, target_h/orig_h); final_w = orig_w*scale; final_h = orig_h*scale. For crop, scale = max(target_w/orig_w, target_h/orig_h); resize then center-crop to target dims. For fill, scale to cover at least one dimension, align accordingly. Cropping uses center-based selection by default, with an option for focal-point adjustments in advanced mode. The tool validates inputs, rejects non-positive dimensions, and ensures output formats are supported.
Typical users include web designers preparing thumbnails, app developers delivering responsive assets, and marketing teams ensuring brand-consistent image sizes across channels. The unique value lies in combining precise dimension math, multiple resize strategies, and quality controls in a single workflow without requiring external calculators or scripting.