Screenshot, slightly improved.

A macOS menu bar utility that works like the built-in Screenshot tool, except every screenshot and screen recording comes out at the exact pixel size the platform you are posting to expects.

The capture frame switching between X, Instagram Square and Instagram Story sizes, then recording video with a Stop button.
curl -fsSL https://realworldbuilder.github.io/slightly-improved-screenshot/install.sh | bash

Paste into Terminal. Requires macOS 26 or later. Installs to Applications and launches; read the script first if you like.

What it does

Presets

X / Twitter1600 × 900
Instagram Square1080 × 1080
Instagram Portrait1080 × 1350
Instagram Story1080 × 1920
LinkedIn1200 × 627
Open Graph1200 × 630

Good to know

The first capture asks for Screen Recording access; grant it in System Settings › Privacy & Security › Screen & System Audio Recording and relaunch. The app is not notarized, so install it with the command above rather than by downloading the zip in a browser. To uninstall, quit it from the menu bar and delete it from Applications.