Aspect Ratio Guide (2026): Picture and Image Ratios in Pixels, With a Chart

Aspect ratio (also called picture ratio or image ratio), in short: it's an image's width compared with its height, written width:height. 1:1 is square (1080×1080), 4:5 is slightly tall (1080×1350), 3:4 is a phone photo (1080×1440), 9:16 is full-screen vertical (1080×1920) and 16:9 is widescreen (1920×1080). To find the ratio of any size, divide the width and height by their greatest common divisor: 1920×1080 ÷ 120 = 16:9. The ratio sets the shape; the pixel count sets the sharpness.

More on this topic: Photo editing how-tos, every guide in one place.

Every platform you post to wants a different shape. Instagram takes 4:5 or 3:4, Stories want 9:16, Pinterest likes 2:3, YouTube and website banners use 16:9, and stores lean on 1:1. Upload the wrong shape and the platform crops it for you, often through the middle of your product. Below: a chart of every common aspect ratio in pixels, how to work out the ratio of any image size, how to turn a ratio into pixels, and how to change a photo's ratio without cutting the product off. To skip the math, the free aspect ratio calculator simplifies any width and height and fills in the missing side when you resize.

What is an aspect ratio?

An aspect ratio is the proportional relationship between an image's width and its height, written as two numbers with a colon, width first. A 1080×1350 image and a 2160×2700 image have the same 4:5 aspect ratio, because both are 4 parts wide to 5 parts tall; one just has more pixels. That's why platform specs list a ratio and a pixel size separately: the ratio decides whether the image gets cropped, and the pixel size decides whether it looks sharp.

Because width comes first, 9:16 is tall (vertical video) and 16:9 is wide (a TV). Mixing them up is the most common reason a Story comes out sideways or squashed. You'll also see ratios written as decimals (1.91:1, or just 1.78) and with an “x” (“3x4”); they mean the same thing.

Common aspect ratios in pixels

This chart covers the ratios behind almost every photo, screen and online placement, with typical pixel sizes for each:

Platform aspect ratios and pixel sizes were checked in October 2026. Marketplaces change their rules, so confirm the current requirements in your seller dashboard before you upload a large batch.

Two notes on the chart. “21:9” is a marketing name: 2560×1080 is really about 2.37:1. And 1.91:1 sizes such as 1200×628 don't divide into whole numbers; platforms accept anything close. Some platforms accept a range rather than one ratio: Instagram feed posts can be anything from 1.91:1 to 4:5, plus 3:4 since 2025. Our platform guides go deeper: Instagram post size, Pinterest pin size and Facebook ad image size.

How do you work out the aspect ratio of an image size?

Divide the width and the height by their greatest common divisor (GCD), the largest number that divides both exactly. What's left is the ratio. If you don't want to find the GCD, divide width by height and match the decimal to the chart below.

1. Write down the size, width first: 1080×1920.
2. Find the largest number that divides both. 1080 and 1920 both divide by 120.
3. Divide each side by it. 1080 ÷ 120 = 9 and 1920 ÷ 120 = 16, so the ratio is 9:16.
4. If the result is awkward (like 683:384 for 1366×768), divide width by height instead: 1.78 is 16:9, so call it 16:9.

Quick decimal reference (width ÷ height): 1:1 = 1.00, 4:5 = 0.80, 3:4 = 0.75, 2:3 = 0.67, 3:5 = 0.60, 9:16 = 0.56, 5:4 = 1.25, 4:3 = 1.33, 3:2 = 1.50, 8:5 = 1.60, 16:9 = 1.78, 1.91:1 = 1.91, 21:9 = 2.33. Or type the size into the aspect ratio calculator, which also matches odd sizes such as 1366×768 to the nearest standard ratio.

How do you convert an aspect ratio to pixels?

Pick the width you need, then multiply it by the second number and divide by the first: height = width × H ÷ W. For 4:5 at 1080 wide, that's 1080 × 5 ÷ 4 = 1350, so the size is 1080×1350. If you know the height instead, width = height × W ÷ H; for 16:9 at 720 tall, 720 × 16 ÷ 9 = 1280.

Round to the nearest whole pixel; one pixel either way doesn't matter. To get an existing photo to one of these sizes, our free image cropper locks the crop box to a ratio and shows the output size in pixels.

What is a 1:1 aspect ratio?

A 1:1 aspect ratio is a square: the width and height are the same. Common 1:1 sizes in pixels are 1080×1080 for Instagram and social posts, 2000×2000 for Amazon and most marketplaces, and 2048×2048 for Shopify. Any size works as long as both sides match, so 500×500 and 4000×4000 are 1:1 too. Square is the safest shape for product images because store grids, thumbnails and search results all show squares. The free square image maker turns any photo into a 1:1 image without cutting anything off, and our 1:1 aspect ratio guide lists the square size for every marketplace and social app.

What is the 4:5 aspect ratio, and how is it different from 5:4?

4:5 is a portrait shape, 4 units wide for every 5 tall; 5:4 is the same shape turned sideways. In pixels, 4:5 is 1080×1350 (or 1600×2000, 2000×2500) and 5:4 is 1350×1080 (or 2000×1600, 2500×2000). 4:5 fills more of a phone screen than a square, which is why Meta recommends it for Facebook and Instagram feed posts and ads. 5:4 is a popular landscape shape for Etsy listing photos (Etsy only asks for at least 2000 pixels wide), and the shape of an 8×10 inch print held sideways.

What is a 3:4 aspect ratio?

3:4 is a portrait shape, 3 units wide for every 4 tall, and it's the default shape of most phone photos held upright (an iPhone photo is 3024×4032). Common 3:4 sizes are 1080×1440 and 1536×2048. Turned sideways it becomes 4:3, such as 4032×3024. Since 2025 Instagram accepts 3:4 feed photos without cropping them and shows the profile grid as 3:4 tiles, so 1080×1440 is a good Instagram size for phone photos. Every 3:4 size, plus 3x4 versus 3:4, is in our 3:4 aspect ratio guide, and every landscape 4:3 size, from 640×480 to 4032×3024, is in our 4:3 aspect ratio guide.

What is a 9:16 aspect ratio?

9:16 is a vertical shape, 9 units wide for every 16 tall: 16:9 turned on its side. The standard size is 1080×1920, used for Stories, Reels, TikTok and YouTube Shorts; 720×1280 and 2160×3840 are also 9:16. Our 9:16 aspect ratio guide lists every size and how to turn a square product photo vertical; for 4:5 sizes, see the 4:5 aspect ratio guide.

What is a 3:2 aspect ratio?

3:2 is the shape of most DSLR and mirrorless camera photos and of 35 mm film: 3 units wide for every 2 tall (1.5:1). Common sizes are 6000×4000 (a 24 MP camera), 3000×2000 and 1500×1000, and a 4×6 inch print is 3:2. Product photos shot on a camera usually need cropping to square or 4:5 for marketplaces and social feeds.

What size is a 16:9 image?

16:9 is widescreen, and the standard sizes are 1280×720 (HD), 1920×1080 (Full HD) and 3840×2160 (4K). It's the shape of TVs, most monitors, YouTube videos and thumbnails, and most website hero banners. Its vertical twin is 9:16, 1080×1920, used by Stories, Reels, TikTok and Shorts. 16:10, also written 8:5, is a little taller than 16:9 (1920×1200 instead of 1920×1080) and is common on laptops. Every 16:9 resolution from 640×360 to 8K, and how to turn a square product photo into one, is in the 16:9 aspect ratio guide.

What are the standard photo print ratios?

Print sizes in inches map to aspect ratios the same way pixels do. If you're cropping a photo for a print, use the matching ratio:

A phone photo is 3:4 and a camera photo 3:2, so a 5×7 or 8×10 print always loses a strip somewhere. The full list of print sizes, including A4 and poster sizes, at 300 and 150 DPI is in photo print sizes in pixels.

What does aspect-ratio mean in CSS?

In CSS, aspect-ratio is a property that gives a box a fixed shape, such as aspect-ratio: 1 / 1 for a square or aspect-ratio: 4 / 5 for a portrait card, with the height worked out from the width. Store themes use it for product grids so every card is the same shape and the page doesn't jump while images load. If your product photos don't match the ratio the theme sets, the theme crops them (with object-fit: cover) or letterboxes them, so match your image ratio to the theme's: usually 1:1 or 4:5.

How do I change an image's aspect ratio without cropping the product?

Change the canvas, not the photo: pad it, blur-fill it, or extend the background with AI. Typing new width and height numbers with the aspect lock off stretches the image, which distorts the product, and buyers notice a squashed bottle immediately.

For square, our free square image maker pads with white, a color or a blur. For any other preset, such as Etsy 5:4 or Instagram 4:5, the free marketplace image resizer pads or crops to the exact pixel size in your browser. Our guide on how to make an image square walks through each option.

Converting with AI

An AI image extender generates new background around the photo to reach the target ratio, so the product stays the same size and nothing is cut. Our AI image extender produces channel sizes such as Instagram 1080×1350, Story/Reel 1080×1920, Pinterest 1000×1500, Etsy 2000×1600, Shopify 2048×2048, Facebook/Google ad 1200×628 and website banner 1920×1080, for 8 credits per size. The product is kept from your photo rather than redrawn. Our AI image extender guide covers which photos extend cleanly.

Which aspect ratio should I shoot in?

Shoot in your phone's default 3:4 (or your camera's 3:2) at full resolution, and leave space around the product. A slightly loose shot can be cropped to 1:1, 4:5 or 2:3 later; a tight shot can't be uncropped without AI. Shooting directly in 1:1 or 16:9 mode on a phone throws away pixels you might need for another channel.

• Leave margin on every side, about 15–20% of the frame.
• Center the product so any crop keeps it intact.
• Shoot at full resolution so crops still have enough pixels.
• Plan the main channel: for a store, compose for square; for TikTok, compose for vertical.

Does aspect ratio affect image quality?

No, the ratio alone doesn't. Quality depends on the number of pixels and how they were captured. But changing the ratio can hurt quality indirectly: cropping removes pixels, so a heavy crop may leave too few for a sharp result, and stretching distorts. If a crop leaves the image smaller than the platform wants, upscale it rather than stretching. AiArter's product photo studio includes upscaling alongside the channel sizes.

Which picture ratio should you use for each job?

Pick the ratio from where the picture will be shown, then pick the pixel size for sharpness. Each ratio below has its own guide with every size in pixels.

Frequently asked questions

What are the different aspect ratios?

The common ones are 1:1 (square), 4:5 and 3:4 (portrait), 2:3 (Pinterest and 4×6 prints), 9:16 (full-screen vertical), 3:2 and 4:3 (camera and phone photos) and 16:9 (widescreen).

What is image ratio?

Another name for aspect ratio: an image's width compared with its height. 1080×1350 has an image ratio of 4:5.

What is an aspect ratio?

An aspect ratio is an image's width compared with its height, written width:height. 1:1 is square, 4:5 and 3:4 are portrait, 16:9 is widescreen and 9:16 is full-screen vertical. Images with the same ratio have the same shape whatever their pixel size.

What aspect ratio is 1080x1920?

1080×1920 is 9:16. Both sides divide by 120, giving 9 and 16. It's the full-screen vertical shape used by Instagram and Facebook Stories and Reels, TikTok and YouTube Shorts.

What aspect ratio is 1920x1080?

1920×1080 is 16:9, the standard widescreen shape of Full HD video, TVs, monitors and YouTube. Both sides divide by 120, giving 16 and 9.

What aspect ratio is 512x768?

512×768 is 2:3. Both sides divide by 256, giving 2 and 3. It's a portrait shape, the same as a 4×6 inch print or a 1000×1500 Pinterest pin.

What is a 1:1 aspect ratio in pixels?

Any size where the width equals the height: 1080×1080 for social posts, 2000×2000 for Amazon and most marketplaces, and 2048×2048 for Shopify are the most common.

What is the 4:5 aspect ratio in pixels?

The standard 4:5 size is 1080×1350 pixels. Larger versions include 1600×2000 and 2000×2500. Turned sideways it's 5:4, such as 1350×1080 or 2000×1600.

What is a 3:4 aspect ratio in pixels?

Common 3:4 sizes are 1080×1440, 1536×2048 and 3024×4032, the default shape of an upright phone photo. Turned sideways it's 4:3, such as 1440×1080.

What is a 3:5 ratio in pixels?

3:5 is 600×1000, 1080×1800 or 1200×2000 pixels as a portrait. A 3×5 inch print at 300 dpi is 900×1500 pixels. Sideways it's 5:3, such as 1800×1080.

What is the 1.91:1 aspect ratio?

1.91:1 is a wide landscape shape, 1.91 times as wide as it is tall. The usual sizes are 1200×628 for Facebook link posts, ads and Open Graph link previews, and 1080×566 for Instagram landscape posts.

What is the 8:5 aspect ratio?

8:5 is the same as 16:10, a widescreen shape slightly taller than 16:9. Common sizes are 1280×800, 1920×1200 and 2560×1600, used by many laptop screens including MacBooks.

How do I calculate aspect ratio?

Divide the width and height by their greatest common divisor; 1920×1080 divides by 120 to give 16:9. To find a missing side, height = width × second number ÷ first number.

What is pixel ratio?

It usually means one of two things. Device pixel ratio is a screen's density, such as 2× or 3× on phones, which is why images should be larger than their display size. Pixel aspect ratio is the shape of each pixel, which is 1:1 (square) for photos and modern screens. Both are explained in what is pixel ratio.

What is picture ratio?

Picture ratio is another name for aspect ratio: the picture's width compared with its height. A 4×6 inch photo is 2:3, an 8×10 is 4:5 and a phone photo is 3:4. Prints and frames are sold by size, so crop to the matching ratio before you print.

What does a high aspect ratio mean?

A high aspect ratio means the image is much wider than it is tall, such as 21:9 or a 5:1 banner. When people talk about tall images, they usually say a tall or vertical ratio, such as 9:16.

What aspect ratio is best for product photos?

1:1 square for store and marketplace listings, 4:5 or 3:4 for Instagram and Facebook feeds, 9:16 for Stories, Reels and TikTok, and 2:3 for Pinterest. Shoot loose so one photo can be cropped or extended to each.

How do I change aspect ratio without cropping?

Pad the photo onto a canvas of the new shape with a solid or blurred fill, or use an AI image extender to generate matching background in the new space. Don't stretch the image, which distorts the product.