How to Compress JPEG Image for Website

JPEG is the most widely used image format on the web — and for good reason. It achieves impressive file size reductions for photographic content. But unoptimised JPEGs straight from a camera or stock photo site can be 5–15 MB. A single uncompressed image can make your entire web page feel sluggish and directly hurt your search rankings.

What JPEG Quality Level Should You Use for Websites?

For web use, a JPEG quality setting of 70–80% is widely regarded as the sweet spot. At 80%, file sizes are typically 3–5× smaller than the original, with no visible quality difference on a standard monitor. At 70%, you get even smaller files — still indistinguishable from the original to the human eye for photographic content.

How to Compress JPEG for Your Website

1. First, resize the image to your actual display width — no larger than 1200px wide for most blogs.
2. Open the Image Compressor at imgresizr.com.
3. Upload your JPG and set quality to 75% as a starting point.
4. Use the live preview to compare compressed vs. original — if you can't see a difference, you're done.
5. Download and upload to your website. Aim for under 150KB per image.

Beyond JPEG — Consider WebP

WebP Gives 25–35% Better Compression

Google's WebP format achieves the same perceived quality as JPEG at significantly smaller file sizes. All major browsers now support WebP, making it an easy win for website performance. Use imgresizr's Convert tool to convert your JPEGs to WebP before uploading.

Serve the Right Size for Each Screen

With responsive images in HTML (srcset and sizes attributes), you can serve a 400px image to mobile users and a 1200px image to desktop users. This prevents mobile visitors from downloading unnecessarily large images, dramatically improving mobile load times.