This used to be easier, but changes in new versions of iOS and macOS have meant that methods such as copying the image via iMessage no longer work.

You’ll need a Mac and an iPhone/iPad with iCloud notes and Continuity enabled.

  1. On your iPhone, open the Notes app and create a new note.
  2. Tap the Markup button in the bottom toolbar (looks like a pencil ✏️).
  3. Tap the + button on the trailing edge of the toolbar.
  4. Tap “Add Sticker”.
  5. Select the sticker you’d like a PNG of.
  6. It will show up in your note, allowing you to move it around, and presenting a hovering toolbar.
  7. Tap the 3 dots button.
  8. Tap copy.
  9. Your Mac will begin reflecting the iOS clipboard.
  10. Open Finder on your Mac and paste the clipboard contents into a folder.
  11. Enter the newly-created folder.
  12. Right click the Assets.bundle folder and select “Show Package Contents”.
  13. Right click the file within the assets bundle and rename it, adding “.png” to its name.
  14. Confirm you want to change the file’s extension.
  15. Open it in Preview and export it to PNG to fix the metadata.
  16. Voila!