To export after effects with transparent background, do the following steps:
- In After Effects, make sure your composition has transparency (check the toggle switch).
- Then, go to the 'Composition' menu and select 'Add to Render Queue.'
- In the Render Queue, choose the output module settings.
- Select a format that supports alpha channels (e.g., QuickTime with Animation codec).
- Click render to export with a transparent background.