How Do I Multistream to Twitch and YouTube?

Why Multistream?

Multistreaming sends one broadcast to Twitch, YouTube, and other platforms at the same time. You reach audiences on every platform without running separate sessions. The tradeoff is higher upload bandwidth demand and the inability to read all chats at once — but for growth-focused creators, the reach advantage is significant.

Method 1 — Restream.io (Easiest)

Restream is a cloud relay service. You stream once to Restream, and it copies your feed to Twitch, YouTube, Kick, and others simultaneously.

1. Create an account at restream.io
2. Connect Twitch and YouTube accounts via OAuth
3. Copy the Restream RTMP URL and stream key
4. In OBS → Settings → Stream, select Custom service and paste both

Free tier supports two platforms. Paid plans add more destinations and analytics.

Method 2 — OBS Multiple RTMP Outputs (Advanced)

OBS 29+ supports multiple simultaneous outputs natively. Enable Settings → Stream → Enable Multiple RTMP Outputs. Configure your primary Twitch output, then add a secondary YouTube output with YouTube's RTMP URL (rtmp://a.rtmp.youtube.com/live2) and your YouTube stream key from YouTube Studio → Go Live.

This method skips a middleman but doubles your upload bandwidth usage. You need at least 12 Mbps upload for dual 6000 Kbps streams.

Method 3 — Streamlabs Ultra

Streamlabs Ultra subscription includes built-in multistream without Restream. Connect platforms in Streamlabs Desktop settings and toggle destinations before going live. Simplest if you already use Streamlabs as your broadcast software.

Platform-Specific Considerations

• Twitch — Partner contracts may restrict simulcasting to competing live platforms; Affiliates face no such restriction as of 2026 policy
• YouTube — set a separate title and category in YouTube Studio before going live; YouTube VODs remain on your channel automatically
• Chat — use Restream Chat or a tool like Social Stream Ninja to merge chat from all platforms into one overlay

Bandwidth Requirements

Each destination needs the full bitrate. Streaming at 6000 Kbps to two platforms requires ~12,000 Kbps upload plus 20% overhead — roughly 14.4 Mbps minimum. If your upload cannot support dual streams, lower to 4500 Kbps per destination or multistream to one platform plus a lower-bitrate backup.

Title and Content Differences

YouTube favors searchable titles; Twitch favors category accuracy. Craft your Twitch title for browse discovery and set a keyword-rich YouTube title separately if your tool supports per-platform metadata (Restream paid plans include this).

Recommended Starting Setup

OBS → Restream (free) → Twitch + YouTube. Add merged chat overlay. Test with a private YouTube stream first, then go public once both platforms show video and audio synced.