rsz.app – Automated subject-aware product photo resizing for multiple marketplaces

Summary: rsz.app automates resizing product photos into various marketplace and social media dimensions by detecting key subjects in images to preserve important content. It eliminates manual cropping and inconsistent results by providing batch processing and an API for integration.

What it does

Users upload a single product photo and select desired output sizes; the tool uses subject detection to resize images without cropping or padding key elements. It includes presets for common marketplace and social formats and supports batch processing and API access.

Who it's for

It is designed for sellers, marketers, and teams managing large product image catalogs across multiple sales channels and social platforms.

Why it matters

It solves the problem of manually cropping images for different platforms by ensuring consistent, subject-focused resizing that fits each channel’s requirements without distortion or unwanted padding.