Images are, more often than any other single factor, the reason a web page loads slowly. A page with a handful of unoptimised photos straight off a camera or phone can carry several megabytes of image weight that a visitor has to download before the page even finishes appearing — and unlike a lot of technical performance work, fixing it is genuinely simple and does not require touching any code.
The Image Compressor handles the compression step; getting the dimensions right first is what makes the biggest difference.
The single biggest win: matching dimensions to display size
A photo uploaded straight from a phone is often 3000–4000 pixels wide. If it is displayed on the page at 800 pixels wide, the browser is downloading four to five times more image data than it will ever show — and then shrinking it down in the browser itself, wasting bandwidth and load time for zero visual benefit. Resizing the image to roughly the size it will actually be displayed at, before uploading it to the site, is consistently the largest single improvement you can make.
Steps
- Work out the largest size the image will be shown at on the page (check your site’s design or CMS for the image container width).
- Resize the source image to roughly that width, plus a little extra for high-resolution screens (about 1.5–2× the display width is a reasonable margin).
- Compress the resized image with the Image Compressor at a light-to-medium level.
- Upload the result to your site instead of the original.
Practical size targets
- Hero or banner images: under 200–300 KB, even at a large display width, is achievable with careful compression.
- In-content photos: 80–150 KB is comfortable for most photographic content shown at typical article width.
- Thumbnails and small product images: well under 50 KB is realistic once properly resized to their small display size.
These are working targets, not hard rules — the goal is to notice when an image is far outside these ranges for its actual purpose, and treat that as a signal to resize and compress it properly.
Choosing a format that suits the content
Photographs belong in JPG or WebP, which handle continuous tones efficiently. Logos, icons and flat graphics with sharp edges or transparency belong in PNG, SVG or WebP rather than JPG, which handles hard edges poorly and can introduce visible fuzzing around text and lines. Using the wrong format for the content is a common, easily fixed source of unnecessary weight — a screenshot saved as PNG when JPG would do, or a photo saved as PNG that should be JPG, are both common on sites that have not paid specific attention to this.
Why this matters beyond load time
Page speed affects more than just how a page feels to use. Search engines factor loading performance into ranking, and a large proportion of visitors on a slow mobile connection will abandon a page that takes too long to load its images, whether or not they consciously notice why. Optimising images is one of the few performance improvements that delivers a real, measurable benefit without any risk of breaking something else on the site, which makes it a good place to start if performance has not been looked at before.
Frequently asked questions
Will visitors notice the quality difference?
At a sensible compression level matched to the correct display size, generally no — the image looks the same on screen while loading significantly faster.
Should I use WebP instead of JPG for everything?
WebP is usually smaller than JPG at equivalent quality and is supported by every current browser, so it is a good default for new images if your site supports it.
Do I need to resize every image on an existing site?
Start with the largest or most-viewed images — the homepage, top landing pages — where the improvement is most visible, then work through the rest over time.
Does compressing an image affect its search engine visibility?
Not directly, though faster page load, which compression contributes to, is itself a ranking factor.
Is the tool free and private?
Yes. No sign-up, no watermark, and files are removed from the server automatically about an hour after processing.