What Aspect Ratios Does MiniMax H3 Support?

Overview

Most current video models cover the common ratios — vertical for short-form, square for feeds, and widescreen for landscape — but the exact supported set for MiniMax H3 depends on the version and route, so confirm the current list on the model or provider page before you plan a format around it.

Source note: Verified 2026-08-06 against the MiniMax official H3 blog, MiniMax Video Generation API docs, and Hugging Face MiniMax-H3 model page.

Aspect ratio is a distribution decision as much as a technical one. Vertical framing suits short-form platforms and mobile-first ads, where a landscape clip gets cropped or letterboxed and loses impact. Square works for many social feeds. Widescreen fits product hero videos and anything destined for a larger screen. Generating in the ratio you will actually publish beats cropping later, because a crop can cut off the subject or ruin the composition the model built for the original frame, and you rarely get it back cleanly.

If you produce for several channels, decide the target ratio per clip up front and prompt with that framing in mind, rather than generating one master and hoping a crop survives across all of them.

When a ratio you need is not directly supported, it is usually better to reframe and regenerate the shot than to stretch or heavily crop a mismatched output, since both tend to look worse than a purpose-built frame and undermine the polish an ad depends on.