Guides › Video aspect ratio guide

Video Aspect Ratio Guide

Video aspect ratio decides the shape of the frame before resolution decides how sharp it is. The best aspect ratio for video depends on where it plays: a 1920×1080 YouTube upload and a 3840×2160 4K upload are both 16:9, while a 1080×1920 Short is 9:16. Choosing the right shape early prevents black bars, awkward crops and wasted screen space when the video reaches its platform.

Best aspect ratio for video by platform

If you only need the recommendation, start here. Pick the row that matches where your video will live, use the common size as your export target, and open the linked calculator to scale it to any resolution while keeping the same shape.

16:9 for standard video

16:9 is the default shape of the modern screen. Televisions, laptops, monitors and the YouTube player are all built around it, so a 16:9 video fills the frame edge to edge with no padding. If you are unsure where a video will end up, 16:9 is the shape that travels furthest without needing a re-crop.

Common 16:9 video sizes

• 1920 × 1080 for Full HD, the standard upload for most channels.
• 3840 × 2160 for 4K, four times the pixels at the identical 16:9 shape.
• 1280 × 720 as a low-bandwidth fallback. Most embeds now ship adaptive renditions, so 1080p is a safe master and 720p only matters when load time outweighs sharpness.

Use the 16:9 aspect ratio calculator to convert between these sizes, or the YouTube aspect ratio calculator if you are exporting specifically for YouTube.

When 16:9 is the safest choice

Reach for 16:9 when the video plays on a horizontal surface or inside a landscape player. It is the right shape for YouTube uploads, smart TVs, desktop monitors, webinars and slide-based presentations, all of which assume a wide frame. Because it matches the display natively, viewers see your full composition with no letterboxing.

When 16:9 is the wrong choice

16:9 fights the phone screen. On TikTok, Instagram Reels and Stories the feed is vertical, so a 16:9 clip either sits in a thin horizontal band with large empty areas above and below, or gets auto-cropped and loses the sides of your shot. For those placements you want a vertical frame instead.

9:16 for vertical video

9:16 is 16:9 turned on its side, matching how people hold a phone. It is the native shape for short-form video, and platforms that expect it give vertical clips the full screen while pushing anything else to the edges. If your video is made to be watched on a phone in a feed, this is the shape to design around.

Common 9:16 video sizes

• 1080 × 1920 for Reels, TikTok and Shorts, the standard high-quality vertical export.
• 720 × 1280 as a smaller but still valid 9:16 export when file size is a concern.

Scale between them with the 9:16 aspect ratio calculator, or use the platform-specific TikTok and Instagram calculators.

Why vertical video needs its own framing

A vertical frame is tall and narrow, which changes how you shoot. Faces, product and action have to be composed for a portrait window rather than a wide one, so wide establishing shots and side-by-side arrangements rarely translate. Plan the vertical composition when you shoot, not as an afterthought in the edit.

Safe-area advice

Platforms overlay the caption, username, buttons and progress bar on top of your video, mostly along the bottom and right edges. Keep faces, key action and any on-screen text away from those edges so the interface does not cover them. Do not simply shrink a 16:9 frame into a vertical canvas unless you add a background or design context to fill the space.

1:1 and 4:5 for feed video

Square and portrait formats sit between full-screen vertical and wide horizontal. They are the practical choices for Instagram and Facebook feed creative, watched in the scrolling feed rather than the full-screen player.

Square feed video

A 1:1 frame such as 1080 × 1080 reads cleanly in grids and carousels, where every tile shares the same square footprint. It also behaves predictably across placements because it looks the same whether the surrounding layout is portrait or landscape. Build square when consistency across a grid matters more than maximum height.

Set up square exports with the 1:1 aspect ratio calculator.

Portrait feed video

A 4:5 frame such as 1080 × 1350 is taller than square, so it takes up more vertical space in the feed and keeps competing posts further down the screen as users scroll. That extra height makes it a strong default for Instagram and Facebook feed video when you want presence without going full 9:16. It is also Instagram's maximum feed height, so going taller gets cropped back toward 4:5 in-feed anyway.

Size 4:5 video with the 4:5 aspect ratio calculator.

21:9 and cinematic formats

Ratios wider than 16:9 look cinematic. 21:9 suits ultrawide monitors and cinematic web sections, for example a hero clip at 2560 × 1080. 2.39:1 is common in feature film work but is not a standard upload target, and it sits between preset pills, so it may need custom width and height inputs in the calculator. Do not use cinematic ratios where platforms expect 16:9 or 9:16 unless the letterboxing is an intentional stylistic choice, because otherwise you are just adding black bars and shrinking your usable frame.

Work out any wide or non-standard shape with the general aspect ratio calculator.

How to convert horizontal video to vertical

Turning a 16:9 master into a vertical clip is a reframing job, not a resize. The methods below range from a quick centre crop to a purpose-built vertical layout.

Crop around the subject

The simplest approach is to crop the 16:9 frame down to a 9:16 window centred on whatever matters most. This works when the subject stays roughly in one place, but you lose everything outside the vertical window, so anything happening at the sides is cut. Check every shot to confirm the important action survives the crop.

Reframe with keyframes

When the subject moves across the frame, animate the crop position with keyframes so the vertical window follows them. This keeps the subject centred through a shot that would otherwise drift out of view. It takes more editing time but produces a vertical version that tracks the action instead of losing it.

Use a blurred background

Placing the full 16:9 clip in the middle of a 9:16 canvas and filling the top and bottom with a blurred, enlarged copy of the same footage keeps the entire original frame visible. It is quick and avoids cropping anything out, though it reads as a repurposed horizontal video rather than a native vertical one. Use it when preserving the whole frame matters more than a purpose-built look.

Build a vertical layout with captions and graphics

The strongest result puts the 16:9 clip in a designed vertical layout, with captions, titles or graphics filling the remaining space above and below. This turns empty canvas into useful information and looks intentional rather than padded. It is the most work but produces vertical video that holds attention in the feed.

Frequently asked questions

What is the best aspect ratio for YouTube?

Use 16:9 for standard YouTube videos and 9:16 for YouTube Shorts.

What is the best aspect ratio for TikTok?

Use 9:16, usually 1080×1920.

Does aspect ratio affect video quality?

The ratio itself does not determine quality, but using the wrong ratio can cause cropping, padding or scaling that reduces visible quality.

Can I upload a square video?

Yes on many platforms, but it may not use as much screen space as the native format.