Why image weight matters
This free tool compresses your images for the web by resizing them and converting them to WebP, without sending them anywhere. Images are often the heaviest part of a web page. On mobile, a heavy image delays the display of the page, and the main image at the top is often the element measured by the Largest Contentful Paint (LCP), one of the Core Web Vitals. Google PageSpeed Insights flags it under “Improve image delivery”.
The two levers: dimensions and format
Compressing an image well means first giving it the right dimensions, then the right format. Measured with this tool on 3 November 2026: a 7.62 MB camera photo converted to WebP at its full size of 3456 × 4608 px weighs 366.5 KB; resized to 1200 px wide, it weighs 53.0 KB. Resizing divided the weight by almost seven, and the WebP format had already done the rest.
Which width for which image
- Image in an article or a page: 800 to 1200 px, depending on the width of your content column.
- Full-width banner: 1920 px.
- Product card or thumbnail: 400 to 600 px.
- Logo: about twice its displayed width, for sharp rendering on high-resolution screens.
To get an exact format such as 1920 × 600 px, see resize and crop images for the web.
Frequently asked questions
How light should an image be for a website?
There is no official threshold. As a rule of thumb, a content image under 200 KB is reasonable. The examples measured with this tool are well below that: 53.0 KB for a camera photo at 1200 px.
Does compressing images improve SEO?
Indirectly. Lighter images make pages faster, and page experience, which includes the Core Web Vitals, is one of the signals Google takes into account. They also make browsing easier on mobile.
Can I compress a WebP that is already on my site?
Yes. Download it, drop it into the tool, lower the width or the quality, then replace the file on your site.
