PixelForgeImage Data Studio
Launch Studio
SEO Toolkit

Check Image Size for Web

Analyze if images are web-optimized.

Drop images to check if they’re web-optimized

Supports JPG, PNG, WebP, HEIC, TIFF and more · Max 40 MB MB

What is Check Image Size for Web?

Analyze if images are web-optimized. Audit whether an image is too heavy or too large for production use. Catch hero images that bloat LCP before you deploy a page. A diagnostic panel with size, dimensions, format, and concrete fixes.

All processing happens locally in your browser. Your images are never uploaded to any server.

Key Features

  • Byte size, dimensions and estimated load time per connection
  • Compares against web-vitals thresholds (200KB, 1080px)
  • Suggests ideal output format and quality

Common Use Cases

  • Auditing whether images on a web page meet recommended size and dimension limits
  • Checking if product photos are optimized before uploading to an e-commerce platform
  • Comparing original vs optimized image sizes to measure compression savings
User Guide

How to use this tool

The Check Image Size for Web tool inspects your images against modern performance best practices and reports a composite health score. It is a fast way to audit an entire folder of image assets before pushing them to production, without opening DevTools or running Lighthouse for each one.

How to use it

Drop one or many images onto the upload zone. Each file is analyzed for dimensions, byte size, format, and aspect ratio. Warnings appear when an image exceeds 500 KB, is wider than 2560 px, sits in an outdated format (JPG/PNG rather than WebP/AVIF), or has an unusual aspect ratio.

A per-image score (0–00) plus an overall average lets you triage the largest offenders first. Green scores above 80 are production-ready; yellow scores between 50–0 need attention; red scores below 50 will hurt page performance.

  • File-size, dimensions, format and ratio checks
  • Per-image and overall performance scores
  • Actionable warnings to guide optimization
  • Bulk analysis for entire folders

What the score means

The scoring model derives from real-world Core Web Vitals data: images larger than 500 KB tend to dominate LCP, images wider than 2560 px waste bandwidth, and non-WebP formats miss 25–0% of potential compression gains. A high average score usually correlates with a well-optimized site.

After running the audit, feed the low-scoring images through the Image Compressor or Optimize for Web tools to bring them into a healthy range.

Frequently Asked Questions

What KB target should I aim for?

Keep hero/LCP images under 200KB and thumbnails under 60KB for best mobile performance.

Does it check for color profiles?

Yes — we flag embedded ICC profiles and sRGB deviations.

What metrics does it check?

File size (KB/MB), pixel dimensions, aspect ratio, format, estimated load time on 3G/4G, and whether the image exceeds common web performance thresholds.

What are the recommended limits?

Aim for under 200KB for content images, max width of 1920px, and use WebP/AVIF formats. The tool flags any image exceeding these thresholds.

Does it actually check my website?

No. You upload individual images and the tool analyzes them locally. It does not crawl your website or make network requests.

Is this tool free to use?

Yes. This tool is completely free with no sign-up, no watermarks, and no daily limits. All processing runs locally in your browser.

What is a good average score?

Aim for 85+ across your image library. Anything above 80 is production-ready.

Are the thresholds configurable?

Not currently. The defaults reflect industry-standard best practices.

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