Picking the Right Aspect Ratio for Each Platform

Quick Reference Table

Platform	Best	Acceptable	Worst
YouTube Live	16:9	1:1	9:16
YouTube Shorts (live)	9:16	none	16:9
Twitch	16:9	1:1	9:16
TikTok Live	9:16	none	16:9
Facebook Live	16:9	1:1, 9:16	none
LinkedIn Live	16:9	1:1	9:16
Kick	16:9	1:1	9:16
Custom RTMP (your website)	16:9 (default)	depends on player	depends on player

The short version: 16:9 for almost everywhere. 9:16 for TikTok-first. If you must compromise across both, 1:1 works passably on either but optimally on neither.

Why Aspect Ratio Matters

Each platform's player is built around a specific aspect ratio. When you broadcast a different ratio:

Letterboxing (black bars top and bottom or left and right)
Cropping (the player crops your content, hiding parts of the frame)
Stretching (bad: distorts faces and graphics)

Letterboxing is the safest mistake. Cropping cuts off important content (the bottom of your lower-third, half your guest's face). Stretching makes everything look amateur.

16:9: The Default

Landscape 16:9 is the historical TV/cinema standard and the default for the major streaming platforms.

Use 16:9 for:

YouTube Live (any kind of stream)
Twitch (any kind of stream)
Facebook Live (default)
LinkedIn Live
Kick
Most embedded players on websites

Examples of strong 16:9 use:

Live interview shows with multiple guests in a Half Screen layout
24/7 music channels with animated wallpapers
Gaming co-streams with gameplay full-screen and cameras in corners
Sermons, lectures, panels, news desks
Movie marathon channels (since most films are landscape)

The downside: 16:9 letterboxes badly on TikTok and other vertical-first platforms. Don't multistream a 16:9 source to TikTok.

9:16: Vertical Streaming

Portrait 9:16 is the mobile-native ratio. Built for one-handed phone viewing, scroll-feed consumption.

Use 9:16 for:

TikTok Live (mandatory for native player)
YouTube Shorts (when streaming Shorts-eligible content)
Instagram Reels live (where supported)

What works in 9:16:

Single-host shows where the host is the focus
Two-host shows with hosts stacked vertically
Music streams with vertical-friendly visuals
Gaming streams designed for mobile (rare but possible)

What doesn't work:

Multi-guest panels (too cramped)
Heavy screen-sharing content (computer screens are landscape)
Gameplay (most games are landscape)
Professional broadcast styles that assume landscape

For TikTok-first creators, build a dedicated 9:16 stream. Don't try to make 16:9 fit.

1:1: The Compromise

Square 1:1 sits between landscape and portrait. It works passably on both kinds of player but optimally on neither.

Use 1:1 for:

Multistreaming where you want one source to look "okay" everywhere
Some Facebook contexts
Older Instagram contexts (less relevant now)

Trade-offs:

Letterboxes on YouTube and Twitch (small bars top and bottom, but viewers don't really notice)
Letterboxes on TikTok (bars top and bottom, more noticeable on mobile)
Loses immersion on every platform vs. the platform's native ratio

Honest take: in 2026, 1:1 is rarely the right choice. Pick 16:9 and accept that TikTok needs a different stream, or pick 9:16 if TikTok is primary.

Multi-Aspect-Ratio Strategy

For creators serious about being on both YouTube/Twitch AND TikTok:

Option 1: Single 16:9 stream (most common)

Stream 16:9 to YouTube, Twitch, etc. Skip TikTok or accept that the TikTok experience will be sub-optimal.

This is what most creators start with.

Option 2: Two parallel streams (production heavy)

Run a 16:9 stream and a separate 9:16 stream simultaneously. Same content, different layouts and framing per ratio.

In playout.video, a stream has one aspect ratio and sends the same picture to all of its destinations. So two ratios means two streams, and your plan needs room for two streams live at once.

This requires:

Two production setups
Cameras and layouts framed for each ratio
More dashboard complexity
Either two computers or careful multi-tasking

But it's the only way to be optimal on both platform families.

Option 3: TikTok-first (rare)

Run only 9:16. Optimize for TikTok. Skip YouTube/Twitch primary, or accept letterboxing on them.

This makes sense if your audience is TikTok-native.

Where Aspect Ratio Is Set

In playout.video, you pick the aspect ratio when you create a stream:

Landscape 16:9
Portrait 9:16
Square 1:1

This affects:

Live Studio layout dimensions
The output every destination receives

Compositions and overlay templates have their own aspect ratio. Build them in the same ratio as the stream they play on.

You can change the ratio later in the stream's Settings tab, under Quality Settings > Aspect Ratio. On a live stream, saving the change stops the stream and starts it again, so viewers see a short break. The YouTube live ends and a new one starts, unless "End broadcast when the stream stops" is off. Only destinations with "Start with the playout" on come back. In Live Studio, the Landscape, Portrait and Square buttons at the end of the layout bar work only while the stream is stopped.

Common Mistakes

Streaming 16:9 to TikTok and assuming it'll be fine. It won't. Mobile viewers see big black bars; the experience screams "not built for TikTok."
Streaming 9:16 to YouTube as your only platform. YouTube's default player is 16:9; vertical content gets letterboxed.
Making content for one ratio and streaming as another. playout.video fits a video of a different shape inside the frame with black bars. A 16:9 video on a 9:16 stream plays as a thin band across the middle.
Picking 1:1 to "be safe." It's mediocre everywhere. Pick a primary platform's ratio instead.

Pro Tips

Test your composition in the actual platform's player before going live in earnest.
Position lower-thirds and overlays in the safe zone of your aspect ratio. Don't put critical text near the edges.
For live shows with multiple guests, 16:9 is dramatically easier than 9:16. Vertical multi-guest is hard.
For solo talking-head content, 9:16 can work as well as 16:9. Pick based on platform priorities.