List Aspect Ratios Command

List supported aspect ratios with resolutions and use cases.

Usage

gemini-nano-banana-tool list-aspect-ratios

Output

Available Aspect Ratios:
  1:1    (1024x1024)  - Square (Instagram post, social media)
  16:9   (1344x768)   - Widescreen (YouTube thumbnail, desktop)
  9:16   (768x1344)   - Vertical (Instagram story, TikTok, mobile)
  4:3    (1184x864)   - Traditional (classic photography)
  3:4    (864x1184)   - Portrait orientation
  3:2    (1248x832)   - DSLR photography
  2:3    (832x1248)   - Portrait photography
  21:9   (1536x672)   - Cinematic (ultra-wide)
  4:5    (896x1152)   - Instagram portrait
  5:4    (1152x896)   - Medium format photography

Usage with Generate Command

# Square (Instagram post)
gemini-nano-banana-tool generate "Modern design" -o square.png -a 1:1

# Widescreen (YouTube thumbnail)
gemini-nano-banana-tool generate "Epic scene" -o wide.png -a 16:9

# Vertical (Instagram story)
gemini-nano-banana-tool generate "Portrait" -o vertical.png -a 9:16

# Cinematic (ultra-wide)
gemini-nano-banana-tool generate "Sci-fi panorama" -o cinema.png -a 21:9

Common Platform Aspect Ratios

Social Media

• Instagram Post: 1:1 (square)
• Instagram Story: 9:16 (vertical)
• Instagram Portrait: 4:5
• Twitter Post: 16:9 or 1:1
• Facebook Post: 1:1 or 16:9
• LinkedIn Post: 1:1 or 16:9

Video Platforms

• YouTube Thumbnail: 16:9
• YouTube Banner: 16:9 (wide)
• TikTok: 9:16 (vertical)
• YouTube Shorts: 9:16 (vertical)

Photography

• DSLR Standard: 3:2
• Medium Format: 5:4
• Classic Film: 4:3
• Portrait: 2:3 or 3:4

Displays

• Desktop/Laptop: 16:9
• Ultrawide Monitor: 21:9
• Mobile Portrait: 9:16
• Tablet: 4:3

Choosing an Aspect Ratio

For social media content:

• Use 1:1 for maximum compatibility
• Use 9:16 for stories and vertical video
• Use 4:5 for Instagram portrait posts

For professional photography:

• Use 3:2 for DSLR standard
• Use 5:4 for medium format look
• Use 2:3 for traditional portrait

For video/cinema:

• Use 16:9 for standard widescreen
• Use 21:9 for cinematic ultra-wide
• Use 9:16 for vertical mobile video

For presentations/displays:

• Use 16:9 for modern displays
• Use 4:3 for traditional presentations