What is the correct aspect ratio for vertical video?

9:16 (1080x1920 pixels) is the standard vertical video format used by TikTok, YouTube Shorts, Instagram Reels, and Snapchat. FluxNote exports in this format by default.

Can I use the same vertical video on all platforms?

Mostly yes, but each platform has slightly different safe zones for UI elements. Test on each platform and make minor text placement adjustments if needed.

Is horizontal video dead?

No. Horizontal (16:9) is still the standard for YouTube long-form, TV, and desktop viewing. But for mobile-first platforms, vertical is essential. Create both formats when possible.

Guide

Vertical VideoShort FormAI

Vertical Videos with AI [Step-by-Step]

Vertical video dominates mobile content consumption. Learn how to create professional 9:16 videos with AI that are optimized for TikTok, YouTube Shorts, and Instagram Reels.

By the FluxNote Editorial Team · Last updated: March 4, 2026

Vertical Videos with AI [Step-by-Step] visual guide

Step-by-Step Guide

Design for vertical from the start

Plan content in 9:16 format from the beginning. Never crop horizontal to vertical.

Generate with AI in vertical format

FluxNote creates content in 9:16 by default with proper framing and text placement.

Optimize text placement

Keep text in the center 60% of the frame. Avoid top and bottom edges where platform UI overlaps.

Test on each platform

Preview how your video looks on TikTok, Shorts, and Reels. Adjust for platform-specific safe zones.

Publish native versions

Upload natively to each platform for best algorithm performance. Make platform-specific adjustments.

Why vertical video is the standard for mobile

Over 75% of all video is consumed on mobile devices, and people hold their phones vertically 94% of the time. Vertical (9:16) video fills the entire screen, creating a more immersive experience than letterboxed horizontal content.

Every major platform now prioritizes vertical video: TikTok, YouTube Shorts, Instagram Reels, Snapchat, and even Facebook. Creating in vertical format is no longer optional, it is essential.

AI tools are optimized for vertical video creation from the start. FluxNote generates content in 9:16 by default, with proper framing, text placement, and safe zones for each platform.

Step-by-step guide

Step 1: Plan for vertical from the start.

Do not create horizontal and crop later. Design your content for 9:16 from the beginning. Step 2: Generate your content with AI. Use FluxNote to create scripts, voiceover, and footage already formatted for vertical video. Step 3: Optimize text placement. Keep subtitles and text in the center of the frame. Avoid the top 15% and bottom 20% where platform UI elements overlap. Step 4: Test on each platform. Preview how your video looks on TikTok, Shorts, and Reels. Each has slightly different safe zones. Step 5: Export and publish platform-specific versions. Make small adjustments for each platform if needed. Publish natively for best algorithm performance.

Tips for best results

Center your text and key visuals in the middle 60% of the frame
Design for thumb-stop, the first frame must be compelling even as a tiny thumbnail
Use large font sizes, at least 40px for subtitles on mobile screens
Avoid horizontal b-roll, it looks cramped and unprofessional in vertical format
Test on your own phone before publishing to verify readability and framing

Common mistakes to avoid

Cropping horizontal video into vertical, it always looks bad
Text in platform safe zones, TikTok, Shorts, and Reels all overlay UI at edges
Tiny font sizes, text must be readable on a phone screen
Important visuals at the edges, keep everything important in the center
Same version for every platform, each platform has different safe zones and UI

Pro Tips

Always design for vertical from the start, never crop horizontal footage
Keep text and key visuals in the center 60% of the frame
Use font sizes of at least 40px for mobile readability
Test on your own phone before publishing to verify everything looks right
Upload natively to each platform instead of using cross-posting tools

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