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Check Image Dimensions on Any Website — Free Online Tool
Bishop81 · 2026-06-03 · via Hacker News: Show HN

Enter a URL to instantly check the dimensions of every image on the page — natural file size, rendered size, and visibility, all in one report.

How It Works

  1. Enter the full URL of any website (including https://)
  2. Our service will scan the page and render all JavaScript
  3. We'll analyze every image on the page, including background images
  4. View detailed information about each image's dimensions and properties

Natural Dimensions

See the original size of each image file

Rendered Size

Compare with how images appear on the page

Complete Analysis

Includes HTML and CSS background images

Enter a URL to analyze

Note: For best results, enter the complete URL including the protocol (https://).

This tool respects website robots.txt files and privacy policies. Some images may not be accessible due to CORS restrictions.

Image Optimization Guides

References and walkthroughs for getting images right on the modern web.

Best Image Sizes for Websites

Recommended dimensions for hero, blog, thumbnail, OG, and favicon images.

Shopify Image Sizes

Product, collection, slideshow, and logo sizes for Shopify stores.

WordPress Featured Image Size

Featured image, default sizes, WebP support, and storage tips for WordPress.

Open Graph Image Size

Per-platform OG image dimensions, required tags, and testing tools.

Hero Image Size

Above-the-fold dimensions, mobile art direction, and Core Web Vitals impact.

Squarespace Image Sizes

Banner, gallery, product, and blog header sizes for Squarespace 7.1.

Webflow Image Dimensions

Hero, CMS, slider, and Ecommerce sizes for Webflow projects.

E-Commerce Product Image Dimensions

Cross-platform product image sizes — Shopify, WooCommerce, BigCommerce, Magento.

Email Header Image Size

Per-client header image dimensions for Gmail, Outlook, and Apple Mail.

Find Oversized Images on Your Website

Why oversized images hurt performance and how to spot them.

Natural vs Rendered Image Dimensions

The difference between an image's file size and how it's displayed.

Image Formats Compared: WebP vs PNG vs JPEG

When to use each format, with file size and quality comparisons.

Image Optimization Checklist

A practical checklist for making site images smaller and faster.

How to Check Image Dimensions on a Website

Three ways to inspect image sizes on any page — devtools, source, and tools.

More Tools

Other free utilities for working with images and dimensions. Converters run entirely in your browser — files never leave your device.

Image Dimensions Analyzer v1.1.0·Affiliate Disclosure

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