Screenshot Composer – Create customizable, client-side screenshots

Summary: Screenshot Composer is a free, open-source single-page app that lets users create screenshots with gradient backgrounds, adjustable padding, shadows, and corner styling. It runs entirely in the browser without requiring accounts or uploads, enabling quick export as PNGs or ZIP files.

What it does

Users upload images, select backgrounds, customize borders, padding, shadows, and corners, then export the results. All processing occurs client-side with no shared state.

Who it's for

It is designed for users needing social-ready screenshots without account creation or payment.

Why it matters

It eliminates login and payment barriers by providing a privacy-focused, offline screenshot composition tool.