Convert 9:16, 16:9, and 1:1 dimensions
— for TikTok, Reels, and Shorts.
Type any width × height. We instantly give you the right dimensions for every platform — with crop preview included.
No signup, no upload — math runs in your browser.
Calculator
FREESource dimensions
Target aspect ratio
Resulting dimensions
608×1080
Crop: 656px from left/right, 0px from top/bottom.
Crop preview
Amber area = what's kept at 9:16. Dark shading = cropped away.
Platform export dimensions
Based on your source (1920×1080) cropped to each platform's preferred ratio.
TikTok
9:16 · Primary format
Instagram Reels
9:16 · Primary format
YouTube Shorts
9:16 · Primary format
Instagram Feed (4:5)
4:5 · Portrait feed post
Instagram Square
1:1 · Square feed post
YouTube / Desktop
16:9 · Landscape standard
Math runs entirely on your device.
How Aspect Ratio Calculator works
Enter your source dimensions
Type any width × height. We instantly reduce to the canonical ratio.
Pick a target platform or aspect ratio
TikTok, Reels, Shorts, square, widescreen — or set a custom ratio.
Generate at the right size in Lumigen
Click "Use in Lumigen" to start a new project pre-sized for your target.
Everything you need to create
stunning videos.
From avatars and voiceovers to captions and exports — all in one place.
Tech Enthusiast
EN · JP
Outdoor Adventurer
EN · DE
Industry Consultant
ES · FR
Senior Executive
EN · ZH
AI Avatars
Choose from 50+ realistic AI avatars. Each speaks naturally with perfect lip-sync, available in 30+ languages.
Get started One tool. Every feature.
Zero learning curve.
Tell us a bit more (Optional)
Create a 60-second TikTok video about the most surprising facts about the Roman Empire, ending with a call to follow
AI Script Generator
Write or generate your video script automatically. Pick a style and let the AI do the rest — or edit it yourself.
Charlotte
Swedish, Female
Lily
British, Female
James
American, Male
50+ Unique Voices
Pick from male and female voices across 30+ languages. Preview any voice before generating.
Realistic AI Avatars
Choose from 50+ hyper-realistic avatars with perfect lip-sync. No green screen needed.
Select a style or pick a template
Video Styles & Templates
TikTok shorts, YouTube docs, product demos — all with dedicated templates optimized for each platform and format.
Anime
Neon
Pixar
Ghibli
Watercolor26+ AI Visual Styles
From cinematic realism to anime, neon, Ghibli, and pixel art — pick a style and every scene is generated to match it.
1920 × 1080
High-Quality — Forever Yours
Export crisp 1080p or 4K videos. Download once and keep forever — even if you cancel.
Works with every platform you use
Export optimized for every platform
Every video format, powered by AI.
From product demos to viral social ads — generate studio-quality videos for any use case in minutes, no editing skills required.
Product Demos
Turn features into 60-second videos that sell
TikTok Shorts
Viral-ready vertical videos that stop the scroll
YouTube Shorts
Short-form content that grows your channel fast
Social Ads
High-converting creatives for every platform
See what you can create.
TikTok stories, YouTube docs, product demos — all generated in under 5 minutes.
Rainy Night in Tokyo
AI Avatar Product Demo
Why Bitcoin Is Digital Gold
Rich Mindset Breakdown
Multi-Scene Showcase
Sync & Dance Duo
More free tools
Stop calculating crops.Generate at the perfect size.
Lumigen generates 1080×1920 vertical video natively for TikTok, Reels, and Shorts — no resize, no awkward letterboxing, no aspect math. Multi-aspect export from a single render in under 5 minutes.
Cancel anytime · Free trial included