Find Aspect Ratio

Find Image Aspect Ratio — Free Online Tool

Quickly find the aspect ratio of any image directly in your browser. This tool reveals the exact width, height, aspect ratio, and decimal aspect ratio instantly after you upload a picture. All processing happens locally on your device, so your images are never uploaded or shared.

How to Use

1. Upload a JPG or PNG image.
2. The image details automatically appear in the right-side panel:
   • Width (px)
   • Height (px)
   • Aspect Ratio (e.g., 16:9, 4:3, 1:1)
   • Decimal Aspect Ratio (e.g., 1.78, 1.33, 1.0)
3. Review the displayed information or use it for design, resizing, editing, or export workflows.

Note: This tool displays information only. If you want to resize or crop images, use the dedicated tools on the site.

Why Check Aspect Ratio?

Aspect ratios matter when preparing images for:

• Social media posts
• Video thumbnails
• Website banners
• Printing and framing
• UI/UX placement
• Cropping or resizing in editing software

Knowing the correct aspect ratio helps maintain composition, avoid stretching, and match platform-specific requirements.

Key Features

• Instant results: Upload an image and get details immediately.
• Accurate calculations: Shows both classic ratio (e.g., 21:9) and decimal ratio for precision use.
• Secure: 100% browser-based. Your images never leave your device.
• Format support: Works with JPEG and PNG.
• No quality loss: Since no editing occurs, your original file stays untouched.
• Browser tested: Optimized for Chrome and Safari.

Tips for Best Results

• Use the decimal aspect ratio when creating videos or responsive web layouts.
• The classic ratio is handy for printing, social media, and photography work.
• If you upload screenshots, remember that odd resolutions (like 1536×864) may give less common ratios.
• Combine this tool with resizing tools if you want to generate a specific aspect ratio output.

How It Works (Briefly)

Once you upload an image, the tool reads its pixel dimensions directly in your browser.
The aspect ratio is computed by dividing width and height by their greatest common divisor (GCD), giving a simplified ratio such as 16:9 or 4:5.
The decimal ratio is simply width ÷ height, rounded to two decimals.
Everything runs locally — no uploads, no servers, no data stored.

Frequently Asked Questions

Is my image uploaded anywhere?

No. All processing stays completely on your device. Nothing is uploaded or stored online.

Which image formats are supported?

The tool supports JPEG and PNG images.

Does this tool modify my image?

No. It only reads the image’s dimensions and calculates its aspect ratio. The file remains unchanged.

Why does my image show a strange decimal ratio?

Some images (especially mobile screenshots) have non-standard resolutions, which produce less common aspect ratios. The tool calculates them accurately.

Which browsers are recommended?

This tool is optimized for Google Chrome and Apple Safari. It may also work on other modern browsers.

Quick Steps (TL;DR)

• Upload PNG or JPG
• Instantly view width, height, ratio, decimal ratio
• No uploads — everything is processed locally
• Works best on Chrome and Safari