BYTETOOLS

Image Size Checker

Check image dimensions, file size, aspect ratio and megapixels online for one or many images at once. Fast, free and fully private in your browser.

Drop one or more images to check their sizeJPG, PNG, WebP, GIF, AVIF, SVG and more

What is the Image Size Checker?

The Image Size Checker instantly reports the pixel dimensions (width × height), file size, aspect ratio and megapixels of any image.

  • Checks multiple images at once in a comparison table
  • Shows width, height, file size, aspect ratio and megapixels
  • Aspect ratio simplified to familiar forms like 16:9 or 4:3
  • Supports JPG, PNG, WebP, GIF, AVIF, SVG and more
  • Instant results with no upload — 100% private
  • Free, no sign-up, works offline as a PWA

How to use the Image Size Checker

  1. 1

    Drop one or more images into the upload area (or click to browse).

  2. 2

    Read each file's dimensions, file size, aspect ratio and megapixels in the table.

  3. 3

    Compare multiple images at a glance to spot outliers.

  4. 4

    Click Clear to start over with a new batch.

About the Image Size Checker

The Image Size Checker instantly reports the pixel dimensions (width × height), file size, aspect ratio and megapixels of any image. Drop in several files at once and compare them side by side in a clean table — perfect for auditing a folder of assets before upload.

Web developers use it to verify banner and thumbnail dimensions, designers use it to confirm export sizes, and marketers use it to check that social media images match platform requirements like 1200×630 for Open Graph or 1080×1080 for Instagram.

All measurements are taken locally in your browser using JavaScript. Your images are never uploaded to any server, so checking confidential mockups and client assets is completely safe.

Frequently asked questions

How do I check the size of an image?

Drop the image into this checker and it immediately shows the pixel dimensions, file size in KB or MB, aspect ratio and megapixels. You can drop a whole batch of images to compare them in one table.

What is the difference between image size and file size?

Image size means pixel dimensions, such as 1920×1080, which determine how large the picture displays. File size is the storage space it occupies, like 350 KB, which depends on format and compression. Two images with identical dimensions can have very different file sizes.

How is aspect ratio calculated?

Aspect ratio is width divided by height, reduced to the smallest whole numbers — 1920×1080 reduces to 16:9. It tells you the image's shape independent of its resolution, which matters when fitting images into fixed layouts.

What image sizes do social media platforms need?

Common targets are 1200×630 for Facebook/Open Graph link previews, 1080×1080 or 1080×1350 for Instagram posts, 1600×900 for X (Twitter) and 1280×720 for YouTube thumbnails. Use this checker to confirm your exports before uploading.

How many megapixels do I need for printing?

At the standard 300 DPI, a 6×4 inch print needs about 2.2 MP, an 8×10 needs 7.2 MP, and an A4 page needs roughly 8.7 MP. The checker shows each image's megapixels so you can match it to your print size.

Guides for Image Size Checker

Related tools