Name: ImageSmith
Rating: 4.9 (1247 reviews)
Author: ImageSmith

Question 1

What is the 4:5 aspect ratio used for?

Accepted Answer

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.

Question 2

What pixel dimensions should a BMP image be at 4:5 ratio?

Accepted Answer

Common 4:5 dimensions include: 1080×1350, 864×1080, 720×900. Choose the size that matches your target platform's requirements.

Question 3

How do I optimize a BMP image in 4:5 format?

Accepted Answer

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.

Question 4

What format is best for 4:5 BMP images?

Accepted Answer

BMP is lossless and great for graphics. WebP is often 25–35% smaller for the same 4:5 image content.

Crop BMP Images to 4:5 (Instagram Portrait)

Other BMP Aspect Ratios

Crop BMP to 4:5 — FAQ