Does this upload to YouTube Studio?

No. You process files locally, download a ZIP, then upload thumbnails or channel art through YouTube as usual.

What thumbnail size does YouTube want?

YouTube specifies a minimum width of 640px for custom thumbnails; 1280×720 (16:9) is the standard HD thumbnail frame. Policies change — confirm in YouTube Help before publishing.

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YouTube thumbnail & channel art (bulk resize)

Match YouTube’s common 16:9 thumbnail frame (1280×720) or channel art canvas (2560×1440) in batches — Free: 20 images, Premium: 100.

Custom thumbnails need a predictable 16:9 frame. Channel art is a wide canvas with a device-dependent safe zone — start from 2560×1440 and keep logos and text near the center.

Open the bulk resize tool and choose YouTube Thumbnail or YouTube Channel Art.

FAQ

Does this upload to YouTube Studio?: No. You process files locally, download a ZIP, then upload thumbnails or channel art through YouTube as usual.
What thumbnail size does YouTube want?: YouTube specifies a minimum width of 640px for custom thumbnails; 1280×720 (16:9) is the standard HD thumbnail frame. Policies change — confirm in YouTube Help before publishing.