What Is Multistreaming?

Multistreaming means sending one live broadcast to more than one destination at the same time — your YouTube channel and your Twitch channel and a Facebook Page, all showing the exact same feed, all going live from a single button press. It’s not three separate streams. It’s one stream that gets copied out to several places after it reaches the server.

The alternative is what most people do by default: pick one platform, stream there, and either skip the others or repeat the whole broadcast later. Multistreaming exists because your audience doesn’t all live on the same platform, and asking them to follow you somewhere else is a worse trade than just showing up where they already are.

There are two ways to get one broadcast onto several platforms, and they behave very differently.

The brute-force way: run a separate encoder instance (or a separate computer) per platform, each one capturing your camera and screen again, each one uploading its own full-bitrate copy of the stream over your internet connection. If you want to hit three platforms at 6 Mbps each, you need roughly 18 Mbps of upload just for video, before anything else on your network. Most home connections don’t have that going spare, and every added destination makes the problem worse.

The single-ingest fan-out way: you send one encoded stream to a single address — a service like CastFork — and the fan-out to every destination happens server-side, on connections with far more bandwidth than your home upload. Your computer only ever sends one copy of the stream, no matter how many places it ends up.

CastFork works the second way. Point OBS, Streamlabs, vMix, or the browser-based Studio at one RTMP address and stream key, toggle on the destinations you want live, and everything downstream of that single ingest point is CastFork’s job, not your upload connection’s.

A CastFork account gets one ingest URL and stream key, and from there you choose which connected channels are enabled for a given stream. That can be:

• Multiple channels on the same platform — two YouTube channels, or a personal and a brand Twitch account.
• A mix of native platforms — YouTube, Twitch, Facebook, X, LinkedIn, TikTok, and Kick connect with a login, no separate setup per platform.
• Custom RTMP or RTMPS destinations — anywhere that hands you a URL and a stream key, on paid plans.

What changes by plan isn’t which platforms you can connect — it’s how many can be live at the same time. See pricing for the full comparison, but the shape of it is below.

The combinations people actually run tend to fall into a handful of patterns:

• A gaming streamer building an audience on Twitch while also posting to YouTube and Kick, so a viewer who prefers either platform still finds them.
• A podcast recorded on video going out to YouTube and X at the same time, so clips and full episodes both have a native home instead of one being an afterthought upload later.
• A church or community event streaming to Facebook and YouTube for the congregation, plus a custom RTMP destination for their own website player, all from the same camera feed.
• A company doing a product announcement on LinkedIn and X simultaneously, so the professional audience and the public audience both see it live instead of picking one and cross-posting a recording afterward.

None of these require different setups per platform — they’re all the same broadcast, with a different set of channels toggled on.

No, and this is worth being specific about because it’s the first thing people assume. CastFork relays the same encoded feed to every destination instead of re-encoding it separately per platform. Passthrough ingest quality is 4K (2160p) on every plan, including Free — the number of destinations doesn’t gate the quality of what any of them receive. Use the bitrate calculator to figure out what bitrate your upload speed can actually support before you go live.

What paid plans change is destination count, Studio’s own output resolution if you produce from the browser, cloud recording length and retention, and collaboration features — not the raw ingest quality itself.

Every platform you’re not on is an audience you’re asking to change their habits to watch you. Multistreaming flips that: you show up where people already are, at no extra production cost, from the same single broadcast. Set the destinations up once on the integrations you use, and every future stream is a toggle, not a rebuild.

It also changes how you think about growth. Instead of picking one platform and hoping it’s the right bet, you can let your audience tell you where they actually are by watching where views land on each destination over time, and adjust which channels you bother enabling — without ever having reworked how you produce the stream itself.