Aspect Ratio Calculator
Calculate exact simplified aspect ratios and find target scaling dimensions.
Drop your image here
Drag & drop single photo for Studio Mode, or multiple photos for 1-Click Batch Processing
Your images stay on your device
Processing happens 100% locally in your browser. Files are never uploaded to any cloud server.
How to use this tool
Upload Image or Enter Dimensions
Drop an image to auto-detect ratio or enter custom width and height.
Calculate Scaled Dimensions
Enter target width to compute matching height, or vice versa.
Why use Image Toolkit?
GCD Ratio Simplifier
Accurately reduces complex dimensions to simplified fractions (e.g. 1920x1080 -> 16:9).
Live Ratio Preview Box
Interactive visual container reflecting proportional dimensions in real-time.
How Aspect Ratio Calculator Works in Your Browser
Unlike conventional online conversion websites that upload your files to remote cloud servers, Lumino processes your media 100% client-side inside your browser sandbox using modern WebAssembly (WASM), WebGPU, and the HTML5 Canvas 2D API.
This means your sensitive photos, identity cards, passport scans, and proprietary design files are processed directly on your local device hardware (RAM/GPU) and are never transmitted across the internet.
Everything You Need to Know
Clear answers on privacy, security, file limits, and image quality.
Related Image Tools
Image Dimension Checker
Inspect exact image width, height, aspect ratio, megapixels, and print DPI sizes.
Image Resizer
Change image dimensions quickly and accurately by pixel or percentage.
Image Cropper
Crop photos to custom dimensions or standard aspect ratios (1:1, 16:9, 4:3, 9:16).