Image Aspect Ratio Calculator
Upload your image to instantly calculate simplified ratio, decimal value, orientation, and matching common aspect ratios. 100% private, fast, and supports all image formats.
Drag & drop your image here
or click to browse
JPG, PNG, WebP, GIF, BMP, SVG, HEIC
Introduction
Ever uploaded a photo and wondered if it fits a 16:9 screen or a 4:3 frame? Our Image Aspect Ratio Calculator instantly gives you the simplified ratio, decimal value, orientation, and compares it to common formats. Whether you're a video editor, web designer, or social media manager, this tool helps you calculate aspect ratio online without any software.
How to use this image aspect ratio finder in 3 steps
- Drag & drop your image into the box above, or click to browse.
- Instantly see width, height, simplified ratio (like 16:9), decimal, and orientation.
- Check which common ratio matches your image – highlighted in green.
What is an Image Aspect Ratio Calculator?
It’s a tool that takes the width and height of any image and simplifies the ratio by dividing both by their greatest common divisor. For example, a 1920x1080 image becomes 16:9. It also shows the decimal (1.777) and tells you if the image is landscape, portrait, or square. No math, no guesswork.
Why you need an online ratio calculator
Maybe you’re uploading a video to YouTube and need the correct 16:9 dimensions. Or you’re designing an Instagram post that requires 4:5. Our aspect ratio tool saves time and prevents errors. It’s also great for checking if an image will fit a specific frame without cropping awkwardly.
Manual calculation vs our advanced tool
Manual: Find GCD, simplify, then figure orientation, then compare to common ratios – time-consuming.
Our tool: All that in one second. No math, no errors.
Free vs Paid: Many advanced tools hide features behind paywalls. Ours is 100% free and private.
Why everyone loves this image ratio checker
Your images stay on your device. We never upload or store anything. Processing happens locally in your browser. That’s why it’s secure and private.
Frequently asked questions
1. What is aspect ratio and how do you calculate it?
Aspect ratio is the proportional relationship between width and height. Our calculator uses the greatest common divisor to simplify it – for example, 1920x1080 becomes 16:9.
2. Can I use this tool for video aspect ratios?
Yes! It works perfectly for video frames, social media posts, and any image. You'll get the exact ratio like 16:9, 4:3, 21:9, etc.
3. Do you store my images?
No. Everything runs in your browser. Your images never leave your computer. We value your privacy.
4. What image formats are supported?
We support all common formats: JPG, PNG, WebP, GIF, BMP, SVG, and even HEIC. If it’s an image, we’ll read its dimensions.
5. Can I check aspect ratio on my phone?
Absolutely. The tool is fully responsive. Just open it on your smartphone, tap the drop zone, and select an image.
6. What if my image ratio is not common (like 17:10)?
We still simplify it to the smallest whole numbers. You'll see the exact ratio, and it won't be highlighted among common ratios – but you'll have the precise value.
7. Is there a limit on file size?
No fixed limit. Very large images (100MB+) might take a moment to load, but they still work. It depends on your device’s memory.
8. Why use this instead of Photoshop or other software?
Photoshop is heavy and expensive. Our tool is instant, free, and doesn’t require opening any software. Perfect for quick checks.