Slow websites lose visitors. Studies consistently show that a 1-second delay in page load time can reduce conversions by up to 7%. And more often than not, images are the biggest culprit. Here are the five most common image mistakes that slow websites down — and exactly how to fix each one.
1. Using PNG When JPG Would Do
PNG is a lossless format. It’s excellent for logos, icons, and graphics — but for photographs, it produces files that are 3–10x larger than an equivalent JPG without any noticeable quality difference.
Fix: If you have photographic images on your site stored as PNGs, convert them to JPG. A photo that was 2MB as a PNG might be 200KB as a JPG at 90% quality, with no visible difference to your visitors.
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2. Not Using Modern Formats Like WebP or AVIF
JPG and PNG were designed decades ago. Modern formats like WebP and AVIF offer dramatically better compression — meaning smaller files at the same quality. Google’s PageSpeed Insights now explicitly recommends serving images in next-gen formats.
Fix: Convert your JPGs and PNGs to WebP (for broad compatibility) or AVIF (for maximum savings). A 500KB JPG might become a 200KB WebP with identical visual quality.
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3. Not Compressing Images Before Uploading
Many people upload images straight from their camera or screenshot tool. Camera images can be 4–12MB each. Even if your CMS resizes them, it often doesn’t compress them properly.
Fix: Before uploading any image, adjust the quality setting. For web use, 85–92% quality for JPG or WebP gives excellent results at a fraction of the file size. Our tool lets you adjust quality with a slider before converting.
4. Uploading Images That Are Too Large (Dimensionally)
A 6000×4000 pixel photo uploaded to a blog post that displays at 800×533 pixels is wasting enormous bandwidth. The browser has to download the full-size image even though it’s displayed at a fraction of the size.
Fix: Resize your images to the dimensions they’ll actually be displayed at before uploading. Combine this with format conversion and compression for maximum savings.
5. Using One Image Format for Everything
There’s no single best image format for every situation. Using JPG for logos creates blocky artefacts. Using PNG for photos creates massive files. Using the same format for everything is a guaranteed path to poor performance.
Fix: Match the format to the content:
- Photos and complex images → JPG or WebP
- Logos, icons, graphics → PNG or WebP
- Anything on a modern website → Consider AVIF for maximum compression
The Payoff of Optimising Your Images
Optimised images mean faster load times, better Google PageSpeed scores, improved SEO rankings, and a better user experience — especially on mobile connections. The good news is that converting and compressing images is now trivially easy.
👉 Start optimising your images now — free, private, no signup required. Try it free at SimpleImageConverter.in