Image Size Converter

Image size converter focuses on translating width and height across unit systems using DPI. It accepts width and height in px, in, cm, or mm, plus a DPI value to anchor physical size.
Core logic converts all inputs to pixels, then converts to the requested target unit. It validates inputs, applies DPI accurately, and returns precise results as numeric values with units.
Audience includes designers, developers, photographers, and print coordinators who need reliable size specifications for assets across web and print contexts. The tool differentiates itself by explicit DPI handling, full unit coverage, and robust error checking, not by UI features.
Use cases include preparing banner images for a 1920x1080 px canvas to 300 dpi print, or sizing an 8.5x11 inch image at 300 dpi for a high-quality PDF. The algorithm supports typical web (72–96 dpi) and print (300 dpi) regimes, with sane defaults and optional aspect-ratio preservation for consistent scaling.
Core features include: multi-unit input, DPI anchoring, cross-unit output, and optional aspect-ratio locking. These enable precise, repeatable results for asset pipelines and automated workflows.