Set it up once, copy your link, drop it into OBS. Live preview updates as you type.
Your setup
Style it below, then hit Save — your OBS overlay updates itself within ~15s. No re-copying, ever.
or paste a URL below
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Live preview
In OBS: Sources → + → Browser, paste this link, set size to your canvas resolution, background is already transparent. Your look is saved to your profile, so this link never changes — just hit Save (top left) whenever you tweak something.