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How to Shrink Image Size by 90% — The Complete WebP Guide

The most common reason a website is slow is heavy images. A single smartphone photo can be 5–10 MB, and when several of them load together, the page slows noticeably. Fortunately, there's a way to cut file size dramatically while keeping almost all of the quality: WebP conversion.

Why reduce file size?

• Speed: lighter images load faster and reduce visitor bounce.
• SEO: Google factors loading speed (Core Web Vitals) into search rankings.
• Cost & storage: you save on storage space and bandwidth.

What is WebP?

WebP is an image format created by Google that produces 25–35% smaller files than JPEG at the same quality, and much smaller than PNG. It also supports transparency, so it can replace PNG. Most modern browsers — Chrome, Edge, Safari, Firefox, and more — support WebP today.

Three ways to reduce size

① Change the format (most effective)

Simply changing JPEG/PNG to WebP greatly reduces file size. The savings are especially dramatic for photos saved as PNG.

② Reduce the dimensions (resolution)

You don't need to upload a 4000px original to the web as-is. For blog body images, 1600px on the long side is usually plenty. Reducing resolution reduces size too.

③ Adjust the quality (compression)

Lowering quality to around 80% is nearly invisible to the eye but greatly reduces size. Use 75–85% for photos, and a bit higher for logos and illustrations.

Convert it for real

You can handle all three at once in the Image Converter.

1. Drag your images in (multiple at once is fine).
2. Choose WebP as the output format.
3. Set quality to 80% and max size to 1600px.
4. Press Convert and the savings vs. the original appear instantly.
5. Save each one, or download them all as a single ZIP.

All conversion happens in your browser, so your images are never sent to a server. You can process sensitive photos with confidence.

Frequently asked questions

Are there places that can't open WebP?

Very old browsers or some legacy programs may not support WebP. In that case, convert to JPEG. If compatibility matters most, choose JPEG; if size matters most, WebP is the answer.

Can I convert many images at once?

Yes. Upload multiple images at once for batch conversion and download them as a single ZIP file.