Turn off the floating screenshot thumbnail preview on Mac

After every screenshot, macOS shows a small thumbnail in the corner of your screen for a few seconds. Handy when you want to annotate — distracting when you're taking a dozen screenshots in a row, or when it hovers over the part of the screen you're trying to capture next.

What the thumbnail actually does

The floating preview (introduced in macOS Mojave alongside ⌘⇧5) lets you do a few things without opening a separate app:

• Click it to open the screenshot in Markup, where you can annotate, crop, or sign.
• Drag it directly into a Mail message, Messages thread, or Finder window — the file goes to your save folder anyway, but dragging from the thumbnail skips the folder entirely.
• Swipe it left to dismiss it early if you don't want to wait for it to fade.

If none of those actions apply to your workflow, the thumbnail is just noise. Disabling it also means screenshots save to disk immediately rather than waiting for the preview timeout.

Disable it via Terminal

Open Terminal (Applications → Utilities) and run:

# disable the floating screenshot thumbnail
defaults write com.apple.screencapture show-thumbnail -bool false
killall SystemUIServer

Your menu bar will flicker briefly while SystemUIServer restarts. That's expected — you don't need to log out or restart.

To bring the thumbnail back:

# re-enable the floating screenshot thumbnail
defaults write com.apple.screencapture show-thumbnail -bool true
killall SystemUIServer

Disable it from the Screenshot app instead

If you'd rather not use Terminal at all, the Screenshot app has a GUI option:

1. Press ⌘⇧5 to open the Screenshot toolbar.
2. Click Options in the toolbar.
3. Uncheck Show Floating Thumbnail.

This writes the same show-thumbnail preference — the Terminal and GUI methods are equivalent.

When to keep the thumbnail on

The thumbnail earns its keep in a few workflows. If you regularly annotate screenshots before sharing them — adding arrows, text, or highlighting a UI element — clicking the thumbnail to open Markup is faster than hunting for the file and opening it separately. It's also useful if you drag screenshots into chat windows frequently; the direct-drag shortcut saves a folder detour.

For everything else — screen recording workflows, rapid-fire UI testing, capturing a sequence of steps — disabling it keeps things cleaner. You can always toggle it back from the Screenshot app or from Mainspring.