Image aspect ratio calculator
Enter a width and height to get the ratio, or a ratio and one side to get the other. Then crop an image to that exact size right below.
Ratio from width and height
Aspect ratio 16:9 (1.778)
Missing side from a ratio
Height 1350 px → 1080 × 1350
PresetCustom size· 1920 × 1080· ratio locked· change platform or size any time after upload· changeable after upload
How to calculate an aspect ratio
- 1
Divide the width and height by their greatest common divisor: 1920 × 1080 ÷ 120 gives 16:9.
- 2
To find a missing height, divide the width by the ratio: 1080 ÷ (4 ÷ 5) = 1350.
- 3
To find a missing width, multiply the height by the ratio: 720 × (16 ÷ 9) = 1280.
- 4
Or use the calculator above, then enter the result in the tool’s custom size to crop your image.
Why some ratios look odd
Not every platform size reduces to small whole numbers. Instagram’s 1080 × 566 landscape size simplifies to 540:283, so it’s usually written as the decimal 1.91:1. The calculator shows both the exact ratio and the nearest common one.
Aspect ratios of social media formats
Every preset sorted from tallest to widest, so you can see which formats share a ratio.
| Image | Size (px) | Ratio | Format | Max file | Notes |
|---|---|---|---|---|---|
| InstagramStory / ReelStory | 1080 × 1920 | 9:16 | jpg | – | Meta recommends 9:16 to avoid cropping or blank space. Its ad guidance suggests keeping roughly the top 14% and bottom 35% free of text and logos. Source ↗Checked 2026-11-11 |
| YouTubeShorts thumbnailThumbnail | 2160 × 3840 | 9:16 | jpg | 50 MB | YouTube's recommended Shorts thumbnail size (minimum height 640 px). Custom Shorts thumbnails can only be added in YouTube Studio on a computer. Source ↗Checked 2026-11-11 |
| PinterestFull-screen Pin (9:16)Story | 1080 × 1920 | 9:16 | jpg | – | Pinterest's recommended size for full-screen images. Keep text out of the top 270 px, bottom 440 px, left 65 px and right 195 px. Source ↗Checked 2026-11-11 |
| PinterestStandard Pin (2:3)Post | 1000 × 1500 | 2:3 | jpg | 20 MB | Pinterest's recommended size. Pins taller than 2:3 might get cut off in feeds. PNG or JPEG, max 20 MB on desktop (32 MB in the app). Source ↗Checked 2026-11-11 |
| InstagramPortrait post (3:4)Post | 1080 × 1440 | 3:4 | jpg | – | Supported in the app since May 2025 (announced by Instagram head Adam Mosseri). Matches the 3:4 profile grid. Meta's publishing API still limits posts to 4:5, so scheduling tools may not accept it. Source ↗Checked 2026-11-11 |
| InstagramPortrait post (4:5)Post | 1080 × 1350 | 4:5 | jpg | – | The tallest ratio in Instagram's documented 1.91:1 to 4:5 range, and the most widely supported portrait size (including scheduling tools that use Meta's API). Source ↗Checked 2026-11-11 |
| LinkedInPortrait post (4:5)Post | 720 × 900 | 4:5 | jpg | 5 MB | LinkedIn's recommended vertical size (from its single-image ad specs, max 5 MB). Larger 4:5 images such as 1080 × 1350 are also accepted. Source ↗Checked 2026-11-11 |
| InstagramSquare postPost | 1080 × 1080 | 1:1 | jpg | – | Instagram keeps feed photos at full resolution up to 1080 px wide; wider photos are scaled down to 1080 px. Source ↗Checked 2026-11-11 |
| LinkedInSquare postPost | 1200 × 1200 | 1:1 | jpg | 5 MB | LinkedIn's recommended square size (from its single-image ad specs, max 5 MB). Fills more of the mobile feed than landscape. Source ↗Checked 2026-11-11 |
| PinterestSquare Pin (1:1)Post | 1000 × 1000 | 1:1 | jpg | 20 MB | 1:1 is an accepted ratio for carousel and collection Pins. For single Pins, Pinterest recommends 2:3. Source ↗Checked 2026-11-11 |
| EtsyListing photo (square)Product photo | 2000 × 2000 | 1:1 | jpg | – | Meets Etsy's 2000 px recommendation. Leave a border around the product: thumbnails are cropped to square, portrait and landscape. Source ↗Checked 2026-11-11 |
| EtsyListing photo (landscape 4:3)Product photo | 3000 × 2250 | 4:3 | jpg | – | Etsy recommends at least 2000 px in width and height, and a landscape or square first photo. Files over 1 MB may not finish uploading on slow connections. Source ↗Checked 2026-11-11 |
| YouTubeVideo thumbnail (4K)Thumbnail | 3840 × 2160 | 16:9 | jpg | 50 MB | YouTube's recommended thumbnail resolution. JPG or PNG, up to 50 MB when uploading from a computer (2 MB from the mobile app). Minimum width 640 px. Source ↗Checked 2026-11-11 |
| YouTubeVideo thumbnail (HD, mobile upload)Thumbnail | 1280 × 720 | 16:9 | jpg | 2 MB | A lighter 16:9 thumbnail that fits the 2 MB limit for uploads from the YouTube mobile app. Source ↗Checked 2026-11-11 |
| YouTubeChannel bannerBanner | 2560 × 1440 | 16:9 | jpg | 6 MB | Minimum 2048 × 1152, max 6 MB. Text and logos must fit the centred safe area: 1235 × 338 at the minimum size, scaled here to 1544 × 423. Source ↗Checked 2026-11-11 |
| InstagramLandscape postPost | 1080 × 566 | 1.91:1 | jpg | – | The widest ratio the feed accepts (1.91:1). Appears small on phones. Source ↗Checked 2026-11-11 |
| LinkedInLandscape post / link imagePost | 1200 × 627 | 1.91:1 | jpg | 3 MB | LinkedIn's recommended size for custom images on posts with a link. Page images must be PNG or JPEG, max 3 MB. Source ↗Checked 2026-11-11 |
| LinkedInProfile cover image (banner)Banner | 1584 × 396 | 4:1 | jpg | 8 MB | JPG or PNG, under 8 MB. Your profile photo overlaps the lower left, so keep key content to the right. Source ↗Checked 2026-11-11 |
| EtsyBig shop bannerBanner | 1600 × 400 | 4:1 | jpg | – | Etsy's recommended size; the minimum is 1200 × 300. Source ↗Checked 2026-11-11 |
| LinkedInCompany page coverBanner | 1512 × 256 | 5.9:1 | jpg | 3 MB | Minimum and recommended size for LinkedIn Page cover images. PNG or JPEG, max 3 MB. Source ↗Checked 2026-11-11 |
| EtsyMini shop bannerBanner | 1600 × 213 | 7.5:1 | jpg | – | Etsy's recommended size; the minimum is 1200 × 160. Source ↗Checked 2026-11-11 |
Frequently asked questions
What is 16:9 in pixels?
Common 16:9 sizes are 1280 × 720, 1920 × 1080, 2560 × 1440 and 3840 × 2160. Any width divided by 16 and multiplied by 9 gives the matching height.
What aspect ratio is 1080 × 1350?
4:5. It’s the portrait format Instagram uses for tall feed posts; LinkedIn also recommends 4:5 for vertical images.
What is the difference between aspect ratio and resolution?
Aspect ratio is the shape (width relative to height); resolution is the actual number of pixels. 1080 × 1080 and 2000 × 2000 have the same 1:1 ratio but different resolutions.
Does changing the aspect ratio stretch my image?
Not here. The tool crops to the new ratio rather than stretching, so people and objects keep their proportions.