Exports never use credits. Once your video is generated or your photo edit is finalized, downloading the output in any included format is free.
All plans include all export formats: 16:9, 9:16, 4:5, and 3:4 for video. Image Studio outputs download at the resolution shown in the composer (2K for standard edits; 2K or 4K for upscales).
If a generation or edit fails, the reservation is released automatically and the credit is refunded. You are never charged for failed jobs.