Transparent video not transparent on site builders like Squarespace

A site builder can re-encode an uploaded video into a format that does not preserve its alpha channel.

Check the original

Open Rotato's transparency tester and test the exported file. If the colored background shows through, the source has working transparency in that test.

If the source is opaque, re-export it with a transparent background and an alpha-capable format.

Compare the hosted file

Check whether the website serves the original file or a processed version. If processing removes alpha, use a hosting path that preserves the original files and the site's supported embed method.

Check each target browser

Transparent-video support depends on format and browser. Test the published page in the browsers your audience uses, rather than relying only on the editor preview.

See transparent videos for the web for the format and embedding workflow. If only one browser fails, check the file being served to that browser.