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Aspect Ratio Calculator & Image Resizer by ZipCraft

ZipCraft's free aspect ratio calculator: upload any image to see its exact ratio and resolution in the unit you choose (px, cm, mm, inches or points) — then resize it to any ratio for any platform with crop, pad or stretch. Nothing is uploaded.

Aspect ratio in your own unit

Aspect ratios are unit-independent — 1920×1080 px, 50.8×28.6 cm and 20×11.25 in are the same 16:9 shape. Pick the unit you work in and every resolution on this page switches to it instantly.

1 · Upload your image
Drop an image here or click to browse

or paste from clipboard with Ctrl / ⌘ + V

PNG · JPEG · WebP · AVIF · SVG · GIF · BMP
Platform specs

Every major platform's accepted ratios

Click any asset to load its exact ratio and resolution into the tool above. Specs are verified against official help centers — but always check the platform's own docs before a paid campaign.

YouTube

Long-form video, Shorts, thumbnails & channel art

Video thumbnail
16:9
1280 × 720 px

Minimum 1280×720. Recommended 1920×1080 for sharpness on big screens. Max 2 MB.

Channel banner
16:9
2560 × 1440 px

Keep your logo & name inside the 1546×423 safe zone — it gets cropped differently on TV, desktop & mobile.

Channel logo / avatar
1:1
800 × 800 px

Shown tiny in comments, so keep it simple.

Short cover
9:16
1080 × 1920 px

YouTube Shorts and Shorts feed thumbnails.

Instagram

Feed posts, Stories, Reels & profile

Feed post (recommended)
4:5
1080 × 1350 px

4:5 takes up the most screen space in the feed and now fills the full rectangular profile grid.

Feed square
1:1
1080 × 1080 px

Classic safe square. Fits into the 4:5 grid.

Feed landscape
1.91:1
1080 × 566 px

Wide posts accepted between 4:5 and 1.91:1.

Story
9:16
1080 × 1920 px

Full-screen vertical. Keep key content clear of the top & bottom UI.

Reel cover
9:16
1080 × 1920 px

Reels are 9:16 vertical video.

Profile icon
1:1
320 × 320 px

Circled — keep the subject centered.

Facebook

Pages, feed posts, covers & Stories

Feed photo
1.91:1
1200 × 630 px

The recommended feed size. Also used for link previews.

Square post
1:1
1200 × 1200 px

Square images are safe across every Facebook surface.

Portrait post
4:5
1080 × 1350 px

Taller posts grab more scroll space.

Page cover photo
851:315
851 × 315 px

Displayed at 851×315 (≈2.7:1) on desktop.

Story
9:16
1080 × 1920 px

Full-screen vertical.

Profile photo
1:1
320 × 320 px

Displays around 170×170 on desktop.

TikTok

Short video built for 9:16 vertical

Video / photo post
9:16
1080 × 1920 px

Native 9:16. Other ratios get cropped or letterboxed — keep the bottom ~25% clear of UI overlays.

Square video
1:1
1080 × 1080 px

Supported, but 9:16 is what performs.

Profile photo
1:1
200 × 200 px

Minimum 200×200.

Discord

Server icons, banners & profile

Server icon
1:1
512 × 512 px

Displayed as a circle — keep the design centered.

Server banner
16:9
960 × 540 px

At least 960×540 (Boosted servers). Upload 1920×1080 for sharpness.

Invite background
16:9
1920 × 1080 px

Appears behind desktop invite links.

Profile banner
5:2
600 × 240 px

Personal profile banner.

User avatar
1:1
128 × 128 px

Upload larger for crispness at any zoom.

X (Twitter)

Posts, headers & link previews

In-feed post image
16:9
1600 × 900 px

Landscape images render large in the feed.

Header photo
3:1
1500 × 500 px

Wide banner. Text is hidden behind the avatar zone on mobile.

Link preview
1.91:1
1200 × 630 px

Card shown when a link is shared.

Profile photo
1:1
400 × 400 px

Circled.

LinkedIn

Feed posts, banners & share cards

Feed / share image
1.91:1
1200 × 627 px

Standard card size for organic posts and articles.

Company banner
4:1
1584 × 396 px

Wide cover for pages.

Profile photo
1:1
400 × 400 px

Circled.

Pinterest

Vertical pins that fill the feed

Standard pin / video pin
2:3
1000 × 1500 px

Tall vertical pins perform best. 9:16 and 1:1 also work.

Profile photo
1:1
165 × 165 px

Displays as a circle.

Snapchat

Full-screen vertical snaps & Stories

Snap / Story
9:16
1080 × 1920 px

Native 9:16 full-screen. Keep content clear of the top & bottom UI.

Profile / Bitmoji avatar
1:1
320 × 320 px

Circled.

Twitch

Offline banners, panels & avatars

Offline banner
16:9
1920 × 1080 px

Shown when you are offline.

Panel
1:1
320 × 320 px

Panels under the stream.

Profile avatar
1:1
300 × 300 px

Circled.

WhatsApp

Profile, Status & business catalogs

Profile photo
1:1
640 × 640 px

Upload high-res so it stays sharp on HD phones.

Status
9:16
1080 × 1920 px

Full-screen status images.

Reddit

Posts, community banners & avatars

Post image
16:9
1200 × 675 px

Landscape images render best in the feed.

Community banner
125:6
4000 × 192 px

Very wide top banner (old & new Reddit render differently).

Community / user avatar
1:1
256 × 256 px

Circled.

How to use

How to convert and resize an image to any aspect ratio

ZipCraft is an aspect ratio converter and image resizer in one: detect the ratio, pick a target, then crop, pad or stretch to the exact size — all locally in your browser.

1

Upload

Drop, click or paste any image — PNG, JPEG, WebP, AVIF or SVG. It never leaves your device.

2

Check the exact ratio

ZipCraft reads the real pixels and shows the precise simplified ratio (e.g. 1920×1080 → 16:9), decimal and resolution.

3

Pick a target

Choose a preset ratio, click a platform asset above (YouTube thumbnail, Instagram post, Discord icon…) or type a custom ratio.

4

Choose a method

Crop to frame your subject, pad to keep the whole image, or stretch for abstract work.

5

Export

Download as PNG, JPEG or WebP at the exact target resolution.

Reference

Common aspect ratios at a glance

Same ratio, different sizes: each row lists the shape plus the pixel size you will usually meet in the wild.

RatioDecimalExample resolutionUsed for
16:91.7781920 × 1080YouTube, TV, monitors, video thumbnails
9:160.5631080 × 1920Shorts, Reels, TikTok, Stories
1:11.0001080 × 1080Square posts, profile photos, avatars
4:51.2501080 × 1350Instagram & Facebook feed posts
3:21.5003000 × 2000DSLR & mirrorless photos, prints
4:31.3331024 × 768Legacy TV, tablets, presentations
21:92.3332560 × 1080Ultrawide monitors, cinematic video
2:12.0001600 × 800Banners & hero images
1.91:11.9101200 × 630Link previews (Open Graph, X/Facebook cards)
5:41.2501600 × 1280Print, large-format
2:30.6671000 × 1500Pinterest pins
5:22.500600 × 240Discord profile banner
16:9

What is a 16:9 aspect ratio?

16:9 is the widescreen standard behind almost all modern video. 1920×1080 (Full HD), 1280×720 (HD) and 3840×2160 (4K) are all 16:9 — the same shape at different sizes. It is the default ratio for YouTube videos and thumbnails, TVs, monitors, presentations and phone screens.

To check whether a size is 16:9, divide the width by the height — if the result is 1.778 (16 ÷ 9), it is 16:9. Switch the preferred unit dropdown above to px, cm, mm, inches or points to see the exact 16:9 resolution in your own unit, or upload an image to ZipCraft and it will detect the exact ratio and resize it to 16:9 by crop, pad or stretch.

Passport photos

Aspect ratio of passport size photos (by country)

Passport photos are specified in cm, mm or inches, and each country's official size has a distinct aspect ratio. Switch the preferred unit dropdown above to cm or mm and the tool will show every resolution in those units — here are the most common official dimensions.

Country / typeOfficial sizeAspect ratioPixels at 300 DPI
United States2 × 2 in (51 × 51 mm)1:1600 × 600 px
India2 × 2 in (51 × 51 mm)1:1600 × 600 px
United Kingdom45 × 35 mm9:7531 × 413 px
Bangladesh45 × 35 mm9:7531 × 413 px
Schengen (EU visa)35 × 45 mm7:9413 × 531 px
Australia35 × 45 mm7:9413 × 531 px
Philippines35 × 45 mm7:9413 × 531 px
Canada50 × 70 mm5:7591 × 827 px

"Pixels at 300 DPI" is the export size that prints at exactly the official dimensions. Switch the preferred unit dropdown above to cm or mm and every resolution on the page updates to that unit.

FAQ

Frequently asked questions

What is an aspect ratio?
An aspect ratio is the proportional relationship between an image's width and height, written as two numbers separated by a colon — for example 16:9. A 1920×1080 video and a 1280×720 video both have a 16:9 ratio: the shape is identical, only the size differs. It is calculated by dividing width by height and reducing the result to the simplest whole numbers using the greatest common divisor.
How do I find the exact aspect ratio of an image?
Upload the image to the ZipCraft aspect ratio calculator (PNG, JPEG, WebP, AVIF or SVG) and it reads the real pixel dimensions and reduces them to the exact simplified ratio — 1920×1080 becomes 16:9. It also shows the decimal value and whether the ratio matches a standard format. Everything runs in your browser and the image never leaves your device.
What's the difference between crop, pad (fill) and stretch?
Crop keeps only the selected area and removes the rest — nothing is distorted. Pad / Fill keeps the entire image and adds new area (a solid color, transparent space or a blurred extension) to reach the target ratio. Stretch resizes the whole image to the target ratio at full size, which can distort faces and shapes. Choose crop when you can afford to lose edges, pad when you must keep everything, and avoid stretch for photos of people or text.
What is the best aspect ratio for social media in 2026?
It depends on the placement. Use 9:16 (1080×1920) for TikTok, Instagram Reels, YouTube Shorts and Stories; 4:5 (1080×1350) for Instagram and Facebook feed posts; and 16:9 (1920×1080) for YouTube long-form video. When one file must work everywhere, 1:1 (1080×1080) is the safest fallback.
What aspect ratio is Instagram?
Instagram supports several ratios at once. Feed posts look best at 4:5 (1080×1350), square posts are 1:1 (1080×1080), landscape posts go up to 1.91:1 (1080×566), and Stories and Reels are 9:16 (1080×1920).
What aspect ratio should I use for TikTok?
TikTok is built around 9:16 vertical video at 1080×1920. Posting any other ratio results in black bars or cropping. Keep the bottom ~25% of the frame clear of the interface overlay so your content isn't hidden behind the UI.
What is the aspect ratio of a YouTube thumbnail?
YouTube thumbnails are 16:9. The minimum size is 1280×720, and YouTube recommends uploading 1920×1080 so thumbnails stay sharp on large displays. The file must be under 2 MB.
Is 1080×1920 the same as 9:16?
Yes. 1080×1920 simplifies to 9:16 (divide both numbers by 120). The two represent the same aspect ratio — just different ways of writing it.
Why does my image look stretched after I change the ratio?
A stretched look means the image was resized to the target ratio without preserving proportions — the stretch method. Use crop or pad instead, or lock the ratio and change only one dimension so the other is calculated automatically.
Can I change the aspect ratio of an image without losing quality?
Yes. Padding changes the ratio without removing any original pixels, so the image content stays at full quality. Cropping keeps quality on the retained area but removes edges. Stretching always introduces distortion, so avoid it for recognizable subjects. Work from the highest-resolution source you have and export at the target dimensions without unnecessary upscaling.
How do I calculate an aspect ratio from width and height?
Divide the width by the height to get a decimal (1920 ÷ 1080 = 1.778), then reduce the two numbers to the simplest whole numbers using the greatest common divisor — 1920:1080 simplifies to 16:9. You can also pick the 16:9 preset (or any preset or platform asset above), or type the exact resolution you need into the Output width and height fields — they stay perfectly locked to the ratio and update in px, cm, inches, mm or points.
How do I calculate an aspect ratio in cm, mm or inches?
Exactly the same way as pixels — an aspect ratio is unit-independent. 6×4 inches, 15.2×10.2 cm and 1800×1200 px are all 3:2. Use the preferred unit dropdown at the top of the tool to switch between px, cm, mm, inches and points — the ratio stays the same while every resolution shown updates to that unit instantly.
What is the aspect ratio of a passport size photo?
It depends on the country. The US and India use 2×2 inches (51×51 mm) which is 1:1; the UK and Bangladesh use 45×35 mm which is 9:7; Schengen/EU, Australia and the Philippines use 35×45 mm which is 7:9; Canada uses 50×70 mm which is 5:7. See the passport photo table on this page and use the preferred unit dropdown to switch between cm, mm and inches for any size.
What is a 16:9 aspect ratio and which resolutions are 16:9?
16:9 is the widescreen ratio where the width is 16 units for every 9 units of height (1.778:1). 1920×1080, 1280×720, 3840×2160 (4K) and 2560×1440 are all 16:9. It is the standard for YouTube, TV, monitors and most video.
How do I convert an aspect ratio without cropping my image?
Use the Pad / Fill method: ZipCraft keeps the entire image and adds a solid color, transparent area or a blurred extension around it to reach the target ratio. Nothing is removed, so no part of the photo is lost. Choose "Pad / Fill" in step 4 of the tool and pick a background.
How do I resize an image to a specific aspect ratio?
Upload the image, pick the target ratio (a preset, a platform asset, a custom ratio), choose crop, pad or stretch, set the resolution you need in the Output width and height fields, then export. Everything runs locally — your photo never leaves your device.