Glossary
Aspect ratio
Also known as: AR
The width-to-height ratio of a generated image or video. Common ratios: 1:1 (square), 9:16 (vertical / TikTok / Reels), 16:9 (horizontal / YouTube), 4:5 (Instagram portrait), 3:4 (editorial vertical).
In depth
What it means in practice
Aspect ratio is set at generation time and affects both output dimensions and the model's composition behavior. A 9:16 vertical prompt produces tighter framing on a single subject than the same prompt at 16:9 horizontal.
For social platforms, the canonical ratios are 9:16 (Stories, Reels, Shorts, TikTok), 1:1 (Instagram feed), 16:9 (YouTube, Twitter video). For editorial and web use, 4:5 vertical and 3:4 vertical are common. Most image and video models on hilens support all standard ratios; some models output at a fixed native size and need a separate crop pass.
Related
Prompt
The text instruction given to an AI model that describes what to generate. For image and video models, prompts mix subject description, style direction, camera or composition hints, and optional negative prompts.
Output resolution
The pixel dimensions of a generated image or video. Common values: 1024×1024 (default for most image models), 4K (Nano Banana 2 portrait), 1080p (most video models).
Aspect ratio
The width-to-height ratio of a generated image or video. Common ratios: 1:1 (square), 9:16 (vertical / TikTok / Reels), 16:9 (horizontal / YouTube), 4:5 (Instagram portrait), 3:4 (editorial vertical).