Aspect Ratio Calculator
Calculate image aspect ratios and use social media dimension presets for Instagram, YouTube, and X.
About this tool
Wrong aspect ratios cause platforms to crop your images unpredictably. Calculate exact ratios and use presets for Instagram, YouTube, TikTok, and X before exporting graphics.
How to use the Aspect Ratio Calculator
- 1
Enter width and height in pixels.
- 2
View the simplified aspect ratio (e.g. 16:9).
- 3
Click a social media preset to load standard dimensions.
Ratio vs resolution
Aspect ratio (16:9) is independent of pixel size — 1280×720 and 1920×1080 share the same ratio. Pick ratio first, then export at sufficient resolution.
Vertical 9:16 dominates mobile feeds; horizontal 16:9 suits YouTube and desktop.
Pro tips
- Design in the target ratio from the start — cropping after is lossy.
- Leave safe margins on Stories and Reels for UI overlays.
Social Media Specs & Character Limits
Optimal text formatting, length guidelines, and parameters for all major platforms:
| Platform | Max Length | Ideal Length | Hashtag Policy |
|---|---|---|---|
| Instagram Feed & Reels | 2,200 chars | 125 - 150 chars | 3 - 5 tags (Recomm.) |
| TikTok Posts | 4,000 chars | 100 - 200 chars | 3 - 5 tags (Ideal) |
| YouTube Description | 5,000 chars | 1,500 chars (SEO) | 3 - 10 tags |
| X / Twitter Post | 280 chars | 100 - 140 chars | 1 - 2 tags |
| LinkedIn Articles & Posts | 3,000 chars | 500 - 1,000 chars | 3 - 5 tags |
Frequently Asked Questions
What aspect ratio is Instagram Reels?▼
9:16 vertical (1080×1920 px).
What is YouTube thumbnail size?▼
1280×720 px (16:9 aspect ratio).