📊 Dimensions · File Size · Format · Aspect Ratio

Image Size Checker — Free Online Tool

Instantly check image dimensions (pixels), file size in KB or MB, aspect ratio, megapixels and format. Drop multiple images to compare. 100% private.

100% Free No Signup Private — No Upload to Server Works on Mobile

How It Works

Upload Your Image(s)

Drop one or multiple image files. Everything is processed locally — your images never leave your device.

View All Details

See width, height, file size in KB/MB, format, megapixels, and aspect ratio in one clear panel.

Take Action

If the file is too large, use our compress or resize tools linked directly from the results.

Frequently Asked Questions

How do I check the size of an image in KB?

Drop your image into the tool above. The file size in KB and MB is shown instantly in the results panel.

What does image resolution mean?

Resolution refers to the number of pixels in an image, expressed as width × height (e.g. 1920×1080). More pixels means more detail but a larger file size.

What is aspect ratio?

Aspect ratio is the proportional relationship between width and height. A 1920×1080 image has a 16:9 aspect ratio. A 1000×1000 image has a 1:1 (square) aspect ratio.

What are megapixels?

One megapixel equals one million pixels. A 4000×3000 image contains 12 megapixels. Higher megapixels means more detail and larger file size.

Can I check multiple images at once?

Yes. Select multiple files at once and the tool will display results for each image separately.

Free Image Size Checker

Before uploading an image to a website, job application form, or social media platform, it is important to know the exact dimensions and file size. Different platforms have different requirements — LinkedIn, NHS job portals, passport photo applications, and ecommerce platforms all specify size limits. Our free checker tells you everything you need to know instantly.

Check Image Size for Job Applications

Many UK job portals including NHS Jobs, Civil Service Jobs, and local council application systems require profile photos to be under 100KB or within specific pixel dimensions. Use this checker to verify your image meets requirements before uploading — and use our Compress to 100KB tool if the file is too large.

Image Size Requirements for Social Media (USA)

LinkedIn profile photos should be 400×400 to 7680×4320 pixels, under 8MB. Twitter/X profile photos are displayed at 400×400. Instagram posts are 1080×1080 for square or 1080×1350 for portrait. Use this checker to verify your images match these specifications before posting.