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Is My Video Really Transparent? Free Alpha Channel Checker
Published · 0:40
A black box behind a transparent video often means the export simply has no alpha channel at all. The free Transparent Video Checker reads the file's alpha flags, tests whether your browser can decode it and previews it on any background you pick. An H.264 MP4 can't be transparent, but VP9 WebM and HEVC MOV can, and Charmotion Studio exports both.
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