Image DPI Converter

This tool accepts image pixel dimensions and DPI values to compute an alternative sizing at 100 DPI for print and distribution. It outputs new pixel dimensions, print size in inches, and an estimated uncompressed file size. It is designed for designers, photographers, and prepress professionals who need precise size planning.
Conceptually, the calculation uses the DPI relationship: pixels = inches × DPI. The tool offers two modes: preserve physical size (keeping printed width/height in inches by adjusting pixel counts) and preserve pixel count (changing print size by DPI while keeping pixel dimensions constant). It also supports a resampling option if actual image resizing is performed downstream. A concrete example: a 1920×1080 image at 300 DPI, targeted to 100 DPI yields 640×360 pixels, with a print size of 6.4×3.6 inches. Outputs include new_width_px, new_height_px, width_in, height_in, and size_estimate_kb; validation flags invalid combinations such as zero or negative DPIs.
The tool does not perform image resampling or modify files itself; it only computes values to inform asset preparation and handoff. This makes it suitable for design studios, ad agencies, and publishing workflows seeking predictable results before resizing or exporting assets.