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Everyone who sees your icon has to download it from Roblox, so if they didn't compress it, it would slow down the speed of the pages on Roblox's website! Rest assured, this happens the every game and there is nothing that you can do to prevent it. This is because Roblox will compress it to reduce the file size.
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When your thumbnail is shown to users, it may not appear in the exact same quality as you uploaded it in. getuniversethumbnails(self, universes: ListUniverseOrUniverseId, size: SizeTupleOrString (768, 432), imageformat: ThumbnailFormat
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Being one of the first things a potential player will see when they are shown your game, it's important that you get it right. Your game's thumbnail is shown to everyone who stumbles across your game in Roblox's game listings and search.
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