Image Size Checker
Free, no sign-up: enter a URL and we load up to 40 images from the page and show each one’s file size, real format (from the file’s contents, not its extension), pixel dimensions versus the size set in HTML, lazy loading and alt — then tell you what to compress, resize or convert to WebP/AVIF. Check your own files in the “My files” tab, right in your browser with no upload.
Rendered size on screen
A server cannot see the size a browser actually draws an image at. Open your page, press F12 → Console and paste the line below to get a table of intrinsic size, rendered size and how many times too large each image is.
console.table([...document.images].filter(i=>i.naturalWidth).map(i=>({src:(i.currentSrc||i.src).split('/').pop().slice(0,60),intrinsic:i.naturalWidth+'×'+i.naturalHeight,rendered:i.clientWidth+'×'+i.clientHeight,dpr:devicePixelRatio,xTooBig:+(i.naturalWidth/Math.max(1,i.clientWidth*devicePixelRatio)).toFixed(1)})).sort((a,b)=>b.xTooBig-a.xTooBig))
Datos clave
Check image sizes on a page: enter an address and see, for each picture, the format from its contents, pixel size, weight, srcset, lazy loading, alt and an estimate of possible savings. Free. You can also check your own files right in the browser. Images from CSS and JavaScript are not counted.
- Precio
- Gratis
- Registro
- No necesario
- Procesamiento
- URL mode runs on our server: the page and up to 40 images are fetched through SSRF protection and not stored; “My files” runs only in your browser
- Entrada
- A page URL (<img> images, up to 8 MB per file) or your own image files
- Límites
- URL mode: 6 checks a minute; 15 a day without an account, 45 with one, unlimited with Pro; “My files” is unlimited
- Resultado
- For each image: format from file contents, pixels, file size, HTML size, srcset, lazy loading, alt and tips; total weight and estimated savings
- Última actualización
Free Image Size Checker
Images are usually the heaviest part of a page, and the problem is rarely how many there are — it is a 4000 px photo shown in a 400 px slot, or a PNG where WebP would do. The tool downloads up to 40 images from a page and shows each one’s real format (from the file contents), pixel dimensions, file size and the size set in HTML, flags lazy loading, srcset and alt, and explains what to fix: resize, compress, convert to WebP or AVIF, replace a GIF with video, add width and height. In the “My files” tab you can check the size and weight of your own images right in your browser without uploading anything.
Cómo usar
- Enter a page URL or open the “My files” tab
- Sort images by weight and start with the heaviest
- Resize and compress, then check the page again
FAQ
PromoPilot frente a alternativas: comparación
Comparamos solo lo que está confirmado en las páginas de cada servicio. Donde no pudimos confirmar un dato, la celda muestra "—".
| Parámetro | PromoPilot | PageSpeed Insights | Squoosh |
|---|---|---|---|
| All images of a page by address | ✓ | ✓ | — |
| Your own files without uploading | ✓ | — | ✓ |
| Notes | format from contents, srcset, lazy loading, alt, savings estimate | Renders the page and its Lighthouse audits count wasted image bytes precisely (sizing, format, compression). | Google’s in-browser app for compressing and converting a single image with a quality preview (WebP, AVIF and more). |
Desplaza la tabla hacia los lados
Dónde somos más débiles: no Core Web Vitals or rendering; only <img> tags and at most 40 images are counted.
Cuándo elegir PromoPilot: When you want a quick overview of every image on a page — real format, pixels, weight and what is excessive — without signing up, or need to check your files before uploading them.
Comprobado el: . "—" significa que no está confirmado en la página oficial; las condiciones y los precios cambian, así que consulta los sitios de cada servicio.