AI Video Sizes for Every Platform: TikTok, Reels, Shorts

You generated a stunning AI video, but it looks terrible on TikTok because the aspect ratio is wrong. Or your perfect Instagram Reel gets cropped awkwardly because you generated it in landscape format. Getting the format right before you generate saves time, credits, and frustration.

This is the definitive reference for AI video dimensions across every major platform in 2026. Bookmark it. Every specification has been verified against current platform requirements as of March 2026.

The Master Format Reference

Platform-by-Platform Deep Dive

TikTok

TikTok is the defining platform for short-form vertical video. Generate at 9:16 (1080x1920) vertical orientation. The first two seconds are critical — TikTok's algorithm measures whether viewers keep watching past the hook. Start your AI video with the most visually striking moment, not a slow build-up.

TikTok compresses uploaded video aggressively, so generating at the highest quality available is important. What looks crisp before upload can look soft after TikTok's processing. Use sharp, high-contrast visuals and avoid fine text that might become illegible after compression.

• Safe zone: Keep critical elements away from the top 15% and bottom 20% of the frame where TikTok UI overlays appear
• Sound: Add trending audio after generation for algorithm boost
• Captions: Add text in editing, not in the AI prompt
• Loop potential: Videos that loop seamlessly get more views. Generate with a circular motion that ends where it began

Instagram Reels

Same 9:16 vertical format as TikTok, but with different algorithmic preferences. Instagram favors slightly longer content (15-20 seconds) and rewards original content over cross-posted TikToks. Generate unique versions for Instagram rather than uploading the same file.

Instagram Stories use the same 9:16 format but disappear after 24 hours. For Stories, shorter AI clips of 5-10 seconds work well as eye-catching visual elements between text-based slides.

YouTube Shorts

YouTube Shorts requires 9:16 vertical at 60 seconds maximum. Unlike TikTok, YouTube Shorts does not loop automatically, so design your video with a clear beginning and end rather than a looping animation. YouTube's compression is less aggressive than TikTok's, so fine details survive better.

YouTube also cross-promotes Shorts to standard YouTube viewers, so quality matters. A well-crafted Short can drive subscribers to your main channel. Use AI video to create attention-grabbing Shorts that tease your longer-form content.

YouTube Standard

For standard YouTube videos, generate at 16:9 horizontal (1920x1080 or 3840x2160 for 4K). YouTube is the one platform where longer, higher-resolution AI video pays off. Viewers expect higher production quality on YouTube compared to TikTok or Reels.

AI video works well for YouTube intros (5-10 seconds), B-roll segments, transition sequences, and supplementary footage within longer videos. Full AI-generated YouTube videos are becoming more common for channels focused on ambient content, visualizations, and artistic compilations.

Facebook

Facebook supports multiple formats, but square 1:1 (1080x1080) performs best in the feed because it occupies more visual space while scrolling. For Facebook Reels, use the same 9:16 vertical format as Instagram. For Facebook ads, both 1:1 and 4:5 (1080x1350) vertical formats deliver strong results.

Facebook users tend to watch video with sound off, so AI-generated videos that communicate visually without relying on audio perform best. Consider adding text overlays in your video editing step.

LinkedIn

LinkedIn is an underutilized platform for video content, and AI video gives you a competitive advantage. Square 1:1 format at 1080x1080 works best in the feed. Keep content professional and business-focused. AI video works well for product demos, data visualizations, event promotions, and thought leadership content on LinkedIn.

Quick Reference: Aspect Ratio Cheat Sheet

Memorize these three aspect ratios and you will never format a video incorrectly:

• 9:16 vertical (1080x1920): TikTok, Instagram Reels, YouTube Shorts, Facebook Reels, Snapchat, Pinterest. This is the default for all short-form vertical content.
• 16:9 horizontal (1920x1080): YouTube standard, website embeds, presentations, LinkedIn (alternative). The traditional video format for longer-form content.
• 1:1 square (1080x1080): Facebook feed, LinkedIn feed, X/Twitter feed. The best format for in-feed video where vertical might feel too tall and horizontal gets squeezed.

When in doubt, generate in 9:16 vertical. Vertical video can be cropped to square or used in vertical-first feeds, while horizontal video cannot be effectively converted to vertical without significant loss of composition.

How to Set the Right Format in ZSky AI

When generating video on ZSky AI, you can specify the aspect ratio and resolution before generation. Here is the quick workflow for each platform format:

1. Select your aspect ratio: Choose 9:16 for TikTok/Reels/Shorts, 16:9 for YouTube, or 1:1 for Facebook/LinkedIn
2. Set resolution: 1080p is the sweet spot for all social platforms. 4K only matters for YouTube standard videos on large screens.
3. Write your prompt: Include the platform context in your prompt. "Vertical composition for social media" helps the AI frame subjects appropriately for portrait orientation.
4. Generate: The video comes out in your specified format, ready to upload

If you are using image-to-video, make sure your source image matches the target aspect ratio. A landscape photo used for a vertical video will be cropped or pillarboxed. Prepare your source images in the correct aspect ratio before uploading.

Content Strategy by Platform

Hook-First Content (TikTok, Reels)

Short-form platforms reward videos that grab attention instantly. Generate AI videos that start with the most visually dramatic moment. A product appearing from nothing. A landscape transformation. A sudden reveal. The first frame must stop the scroll. Use our video prompts guide to craft attention-grabbing opening sequences.

Value-First Content (YouTube, LinkedIn)

Longer-form platforms reward content that delivers value. AI-generated explainer videos, tutorials, and demonstrations perform well when they prioritize clarity and information over visual flash. Use clean backgrounds, simple compositions, and clear visual narratives.

Aesthetic Content (Pinterest, Instagram Feed)

Visual-first platforms reward beauty and inspiration. AI excels at generating gorgeous, aspirational content: stunning landscapes, dreamy product shots, and artistic visual sequences. Focus your prompts on aesthetic quality, lighting, and color harmony. For more prompt techniques, see our AI video prompts guide.

Repurposing AI Video Across Platforms

The most efficient approach is to generate once at the highest quality and largest format, then adapt for each platform. Here is the recommended workflow:

1. Generate the master clip: Create your AI video at 4K 16:9 or 1080p 16:9. This is your master asset.
2. Crop for vertical: Extract the center portion for 9:16 vertical versions (TikTok, Reels, Shorts).
3. Crop for square: Extract the center for 1:1 versions (Facebook, LinkedIn).
4. Trim for duration: Cut to the optimal duration for each platform from your master clip.
5. Add platform-specific elements: Text overlays, captions, music, and calls-to-action customized for each platform.

Alternatively, if your content is primarily for vertical platforms, generate at 9:16 first and adapt to other formats. The key is choosing your primary platform and optimizing for it, then adapting rather than trying to serve all platforms with one format.

For guidance on post-generation editing, check our best AI video editing tools guide. For tips on syncing music to your social videos, see our guide on adding music to AI videos.

Platform Algorithm Insights for AI Video

What Algorithms Reward

Every social platform's algorithm evaluates video content differently, but common signals include: watch time (what percentage of viewers watch to the end), replay rate, shares, saves, and comments. AI-generated video can optimize for these signals through intentional design choices:

• Hook in frame one: Start with the most visually dramatic moment. This maximizes the chance that scrolling viewers stop and watch.
• Loop-friendly endings: Design the last frame to connect visually to the first frame. Seamless loops increase replay rate, a strong algorithm signal.
• Shareability factor: Generate content that viewers want to show others: visually stunning scenes, surprising transformations, or satisfying visual loops.
• Save-worthy content: Educational or reference content gets saved for later. AI video explainers and tutorials accumulate saves over time, boosting long-term reach.

Posting Frequency by Platform

AI video generation makes higher posting frequencies practical. Here are the recommended frequencies for maximum growth on each platform:

• TikTok: 1-3 videos per day. Volume matters on TikTok more than any other platform.
• Instagram Reels: 4-7 Reels per week. Consistency matters more than daily volume.
• YouTube Shorts: 3-5 per week. YouTube rewards channel consistency over burst posting.
• LinkedIn: 2-3 videos per week maximum. Over-posting on LinkedIn reduces engagement per post.
• Facebook: 3-5 per week. Vary between Reels and feed videos for maximum reach.

With AI video generation, these frequencies are achievable even for solo creators. Generate a batch of clips in one session, edit them into platform-specific formats, and schedule them across the week using a publishing tool.

Common Format Mistakes to Avoid

• Generating landscape for TikTok: Your video will have massive black bars above and below. Always generate in 9:16 for vertical platforms.
• Ignoring safe zones: Platform UI elements overlay parts of your video. Keep critical content within the center 70% of the frame.
• Over-relying on text in prompts: AI-generated text in video is unreliable. Add text overlays in editing after generation.
• Same duration for every platform: A 60-second video loses viewers on TikTok but feels rushed on YouTube. Match duration to platform expectations.
• Ignoring compression: Platforms compress uploaded video. Generate at the highest quality available so your video survives compression looking sharp.

Batch Generation Workflow for Multi-Platform Content

The most efficient approach for creators who publish across multiple platforms is a batch generation workflow. Here is the step-by-step process:

1. Plan your content calendar: Decide on three to five content themes for the week. Each theme will become one piece of content adapted for multiple platforms.
2. Generate master clips: For each theme, generate AI video clips in the highest quality and largest format. Use ZSky AI to create your raw footage.
3. Create platform versions: In your editor, create separate project files for each platform format. Import the same master clips but crop and trim differently for each platform's requirements.
4. Add platform-specific elements: Each platform version gets its own music choice, text overlays, and call to action. TikTok versions get trending audio. LinkedIn versions get professional lower thirds. Instagram versions get branded filters.
5. Schedule and publish: Use a scheduling tool to distribute each version to its target platform at optimal posting times.

This workflow produces five to fifteen pieces of platform-optimized content per week from just three to five AI generation sessions. The time investment is two to three hours per week, which is dramatically less than creating unique content for each platform from scratch.

Frequently Asked Questions

What aspect ratio should I use for TikTok videos?

TikTok uses 9:16 vertical aspect ratio at 1080x1920 pixels. This is the standard for all short-form vertical video platforms. When generating AI video for TikTok, specify vertical or portrait orientation and 9:16 aspect ratio in your settings. Keep the main subject centered to account for the TikTok interface elements that overlay the top and bottom of the video.

Can I use the same AI video on multiple platforms?

You can, but it is not recommended for best results. Each platform has different aspect ratios, duration sweet spots, and audience expectations. A 9:16 TikTok video will have black bars on YouTube's 16:9 player. A 60-second YouTube Short may lose viewers who expect 15-second TikTok clips. For maximum engagement, generate platform-specific versions of your content with the correct aspect ratios and optimized durations.

What is the ideal video length for Instagram Reels?

Instagram Reels supports up to 90 seconds, but the algorithm favors videos between 7 and 30 seconds. The sweet spot for maximum reach is 15 to 20 seconds. Shorter Reels get more replays which boosts the algorithm signal. For AI-generated Reels, focus on one strong visual concept with attention-grabbing motion in the first 2 seconds. Generate at 1080x1920 vertical format.

What format works best for LinkedIn video?

LinkedIn supports both 16:9 horizontal and 1:1 square formats, but square 1:1 at 1080x1080 performs best in the feed because it takes up more visual space while scrolling. Keep LinkedIn videos between 30 and 90 seconds. Professional, clean visual styles work best on LinkedIn. Avoid flashy transitions and prioritize clear, informative content with a business-appropriate aesthetic.

How do I add text overlays to AI-generated social media videos?

After generating your AI video, import it into any video editing tool to add text overlays. Free options include CapCut, InShot, and the native editors in TikTok and Instagram. Keep text in the safe zone away from platform UI elements. Use high-contrast colors for readability. Add text during editing rather than in the AI prompt, as AI text generation in video is not yet reliable enough for clear, readable text overlays.