Crop BMP Images to 4:5 (Instagram Portrait)
The 4:5 Instagram Portrait ratio is used for: Instagram portrait posts, Facebook portrait ads, social media portraits, fashion photography. Instagram's recommended portrait format — takes up maximum feed real estate while remaining within Instagram's crop limits. Consistently outperforms square posts. When preparing BMP images in 4:5 format, optimize file size alongside the crop — ImageSmith compresses your BMP to the perfect size for any platform. Common 4:5 dimensions: 1080×1350, 864×1080, 720×900.
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Aspect Ratio
4:5
Name
Instagram Portrait
Format
BMP
Example size
1080×1350, 864×1080, 720×900
▸Instagram portrait posts
▸Facebook portrait ads
▸social media portraits
▸fashion photography
Reduce file size too?
Compress your BMP — instant, browser-based, free.
Other BMP Aspect Ratios
Crop BMP to 4:5 — FAQ
Instagram's recommended portrait format — takes up maximum feed real estate while remaining within Instagram's crop limits. Consistently outperforms square posts. Common use cases include: Instagram portrait posts, Facebook portrait ads, social media portraits, fashion photography.
Common 4:5 dimensions include: 1080×1350, 864×1080, 720×900. Choose the size that matches your target platform's requirements.
Upload your BMP image to ImageSmith and set a target file size. The tool compresses to any size while maximizing quality — browser-only, no uploads.
BMP is lossless and great for graphics. WebP is often 25–35% smaller for the same 4:5 image content.