What is the best aspect ratio for TikTok and Instagram Reels?

Vertical short-form video on TikTok, Instagram Reels, and YouTube Shorts uses 9:16 aspect ratio with a recommended pixel resolution of 1080×1920.

What is 4:5 aspect ratio on Instagram?

4:5 (1080×1350 pixels) is Instagram's portrait feed format. It occupies the maximum vertical screen space on mobile phones, delivering significantly higher engagement than classic 1:1 square posts.

How do I calculate aspect ratio from two pixel numbers?

Divide both width and height by their greatest common divisor (GCD). For example, 1920 / 120 = 16, and 1080 / 120 = 9, yielding 16:9.

PRECISION RATIO & DIMENSION SOLVER • 100% FREE

Aspect Ratio Calculator

Quickly compute dimensions for 16:9, 9:16, 4:5, 1:1, and 21:9 video and images. Two-way interactive solver with live visual preview and social media dimension cheatsheet.

Two-Way W ↔ H Calculation

Retina 2x & 4x Scaling

Social Media Cheat Sheet

Popular Aspect Ratio Presets

Aspect Ratio (Width : Height)

Width (Pixels)

Height (Pixels)

Scale Multipliers

Visual Scale Preview

1920 × 1080 (16:9)

16:9

Social Media Aspect Ratio & Dimension Cheat Sheet (2026)

Recommended pixel resolutions for maximum sharpness across Instagram, TikTok, YouTube, and X.

Platform & Format	Ratio	Resolution (Pixels)	Purpose & Note
YouTube Video	16:9	1920 × 1080 (1080p)	Standard HD / 4K landscape
TikTok / Reels / Shorts	9:16	1080 × 1920	Full screen vertical video
Instagram Portrait Feed	4:5	1080 × 1350	Maximum screen real estate
Instagram Square	1:1	1080 × 1080	Classic grid photo
Twitter / X In-Stream	16:9	1200 × 675	Landscape timeline media
Facebook Shared Image	1.91:1	1200 × 630	Link previews & timeline
LinkedIn Header	4:1	1584 × 396	Profile background banner

Standard & Ultrawide

Full support for classic 16:9 broadcast, 21:9 ultrawide, and anamorphic 2.39:1 Hollywood aspect ratios.

Mobile Short-Form

Accurate 9:16 and 4:5 ratios tailored for TikTok, Instagram Reels, YouTube Shorts, and Snapchat.

Editor-Ready Copy

1-click copy formatted resolution strings ready to paste into Premiere Pro, Final Cut, DaVinci, or Figma.

How to Calculate Aspect Ratios with PullDL

Complete the task in a few clear steps without unnecessary setup.

Select Preset or Enter Ratio

Pick from standard ratios (16:9, 9:16, 4:5, 1:1, 21:9) or type your custom ratio in the Width:Height fields.

Enter Width or Height

Type in any target pixel dimension. The opposite dimension updates instantaneously without distorting proportion.

Scale & Copy Dimensions

Use 0.5x, 1x, or 2x scaling buttons, then click 'Copy Dimensions' to paste directly into Photoshop, Figma, Premiere Pro, or CapCut.

Frequently Asked Questions

Everything you need to know about PullDL Aspect Ratio Calculator.

YouTube's default widescreen player uses 16:9. Standard resolutions include 1920×1080 (1080p FHD), 2560×1440 (1440p QHD), and 3840×2160 (4K UHD). For YouTube Shorts, use 9:16 (1080×1920).