The wrong aspect ratio is the fastest way to tank an otherwise great AI-generated music video. A 16:9 landscape video cropped to fit a 9:16 TikTok slot loses 75% of the frame. A 9:16 vertical video posted to YouTube full shows with massive black bars. Every platform has specific expectations, and algorithms down-rank content that doesn't match. Here are the specs that matter in 2026.
TikTok: 9:16 Vertical, Under 3 Minutes
Native aspect ratio: 1080x1920 (9:16 vertical). Max duration has grown to 10 minutes, but music videos perform best at 15-60 seconds for discovery. The safe zone — the area not covered by UI elements — sits in the middle 60% of the frame vertically. Keep critical visual content and text out of the top 200 pixels and bottom 400 pixels to avoid overlap with TikTok's UI.
Most AI tools aimed at social (including Revid) default to 9:16 output. For tools that default to 16:9 (Runway, Sora, Kling), you'll need to either generate in 9:16 mode if available or crop in post.
Instagram Reels: 9:16 Vertical, Under 90 Seconds
Same aspect ratio as TikTok (1080x1920), but the safe zone is slightly different because Instagram's UI overlays more of the bottom. Keep critical content above the bottom 500 pixels. Max duration is 90 seconds for most accounts, though some have access to longer. Optimal performance is 15-30 seconds for discovery.
Cross-posting from TikTok to Reels is common, and the same file usually works for both. Just preview both platforms before publishing to confirm the safe zones work for your specific video.
YouTube Shorts: 9:16 Vertical, Under 60 Seconds
Same 1080x1920 vertical format as TikTok and Reels. Maximum duration is 60 seconds, full stop. If your video is 61 seconds, YouTube classifies it as a regular video, not a Short, and it loses Shorts feed distribution. Pay attention to this limit.
YouTube's algorithm rewards Shorts that hook viewers in the first 2 seconds. For music videos, this means front-loading your most compelling visual moment rather than building up to it.
YouTube Full Video: 16:9 Horizontal
Native aspect ratio: 1920x1080 minimum, 3840x2160 (4K) if your tool supports it. Match the full duration of your track for music video uploads. Aspect ratio matters less for YouTube full videos than for mobile-first platforms, but 16:9 is still the expected default. Vertical videos on YouTube full render with black bars and look unprofessional.
For AI tools that output 9:16, produce a separate horizontal version for YouTube full. Don't try to crop a vertical video to horizontal — you'll lose too much of the frame.
Spotify Canvas: 9:16 Vertical, 3-8 Seconds, Loopable
Canvas has strict requirements. Aspect ratio: 9:16 (1080x1920). Duration: exactly 3-8 seconds. Format: MP4. The video must loop seamlessly — the last frame needs to connect back to the first without a visible cut. File size: under 25MB.
This is the most constrained music video format. Most AI tools don't natively produce Canvas-ready output. The workflow is usually: generate a longer clip, export a 6-8 second segment with matching first and last frames, upload to Spotify for Artists. See our Spotify Canvas guide for the detailed workflow.
Apple Music: 16:9 Horizontal
Apple Music supports music video uploads through Apple Music for Artists (via distribution partners). Spec: 16:9 horizontal, 1920x1080 minimum, full track duration. Similar to YouTube full, this is the home for your flagship music video rather than social cuts.
Cross-Platform Strategy
Produce one flagship horizontal version for YouTube full and Apple Music. Produce a vertical cut for TikTok, Reels, and Shorts. Produce a Canvas loop for Spotify. Three versions cover all major platforms. Tools like CapCut make format conversion fast once you have the source material.
For AI-first workflows: use Revid for 9:16 output (covers TikTok, Reels, Shorts). Use Runway or Kling in 16:9 mode for YouTube full. Extract a loopable segment for Canvas. This stack produces platform-optimized content for every major distribution surface.
Common Aspect Ratio Mistakes
Generating in one aspect ratio and cropping to another. This loses critical visual content and looks amateur. Always generate in the target aspect ratio if the tool supports it. Ignoring safe zones for platform UI. Text or critical visuals hidden behind UI elements waste the creative work. Producing only one format and hoping it works everywhere. It won't. Allocate time to create platform-native versions.
Our Recommendation
For creators publishing to multiple platforms: produce three versions per release (horizontal, vertical, Canvas loop). Use Revid for vertical social content, Runway or Kling for horizontal flagship videos, and edit a Canvas loop from either source. See our tool ranking for more context on which tools support which aspect ratios natively.