What is WebP?
WebP is a modern image format developed by Google and released in 2010. It was designed from the ground up to replace both JPEG and PNG for web use — and it does exactly that.
Today, WebP is supported by 97%+ of all browsers worldwide, including Chrome, Firefox, Safari (since 2020), and Edge. There is no good reason not to use it.
WebP vs JPEG vs PNG — The Numbers
Here's how WebP compares to the formats you're probably using right now:
| Format | Type | Transparency | Avg. File Size | Best For |
|---|---|---|---|---|
| JPEG | Lossy | ❌ No | Baseline | Photos |
| PNG | Lossless | ✅ Yes | 2–3× larger than JPEG | Graphics, logos |
| WebP (lossy) | Lossy | ✅ Yes | 25–35% smaller than JPEG | Everything |
| WebP (lossless) | Lossless | ✅ Yes | 26% smaller than PNG | Graphics, logos |
The data comes from Google's own benchmarks. In practice, a 500 KB JPEG photo converted to WebP at 80% quality typically comes out at 150–250 KB — with zero visible quality difference.
Why File Size Matters So Much
Every kilobyte saved on images directly improves:
- Page load speed — images are typically 50–70% of a page's total weight
- Core Web Vitals — specifically LCP (Largest Contentful Paint), which Google uses as a ranking signal
- Mobile experience — on 4G connections, a 2 MB page feels slow. A 600 KB page feels instant
- Bandwidth costs — if you serve millions of images, smaller files mean lower CDN bills
WebP Supports Everything You Need
One of the biggest misconceptions about WebP is that it only supports lossy compression like JPEG. That's wrong. WebP has two modes:
- Lossy WebP — like a smarter JPEG. 25–35% smaller at the same visual quality. Perfect for photos and hero images.
- Lossless WebP — like a better PNG. 26% smaller with pixel-perfect reproduction. Perfect for logos, icons, and screenshots with text.
WebP also supports transparency (alpha channel) in both modes — something JPEG can't do at all.
What Quality Setting Should I Use?
WebP quality works differently from JPEG. A WebP at 80% quality is visually indistinguishable from the original for almost all images, while being 3–5× smaller than the equivalent PNG.
- 90–95% — Near-lossless. Use for product photography or anything where fine detail matters.
- 80–85% — Recommended for most web images. Invisible quality loss, huge size savings.
- 65–75% — Good for thumbnails, preview images, and non-critical graphics.
- Below 65% — Noticeable compression artifacts. Avoid unless file size is absolutely critical.
Browser Support — Is WebP Safe to Use?
Yes. As of 2025, WebP is fully supported across all major browsers:
- Chrome — since version 23 (2012)
- Firefox — since version 65 (2019)
- Safari — since version 14 (2020)
- Edge — since version 18 (2018)
- Samsung Internet, Opera, and all modern mobile browsers
The only browsers that don't support WebP are Internet Explorer (which Microsoft officially retired in 2022) and very old mobile browsers. For virtually all real-world traffic, WebP is completely safe.
How to Convert Your Images to WebP — Free
You don't need Photoshop, Squoosh, or TinyPNG. Colgenz has a free WebP Converter that runs entirely in your browser. Your images never leave your device.
- Go to colgenz.com/tools/webp-converter
- Drop your JPG or PNG files (supports batch conversion)
- Choose your quality preset — High (85%) is the recommended starting point
- Click Convert and download your WebP files
You can also use the All-in-One Image Tool to convert, resize, and compress in one step.
WebP for Different Use Cases
Hero images and banners
Use lossy WebP at 80–85%. A 1920×1080 hero image that was 800 KB as JPEG will typically be 200–350 KB as WebP. That's a massive win for LCP score.
Product images (e-commerce)
Use lossy WebP at 85–90%. Customers need to see fine details, so don't go too aggressive. Still expect 30–40% savings over JPEG.
Logos and icons
Use lossless WebP. You get the transparency of PNG with 20–30% smaller file size. Or consider SVG if the logo is vector-based.
Blog post images and thumbnails
Use lossy WebP at 75–80%. These are secondary images where perfect quality isn't critical. 50–70% size savings are common.
Background textures and patterns
Use lossy WebP at 70–80%. Textures are rarely examined closely, so you can push compression harder.
AVIF — What About the Next Format?
AVIF is the next-generation format after WebP, offering even smaller file sizes (roughly 20–30% smaller than WebP at the same quality). However, as of 2025:
- AVIF is supported by ~90% of browsers — not quite universal yet
- Encoding is significantly slower (minutes vs seconds for large batches)
- Safari support for encoding is still inconsistent
The recommendation: use WebP now. WebP gives you 90% of the benefit with 100% browser support and instant conversion. Revisit AVIF in 2026 when support matures.
Summary — Why WebP Wins
- ✅ 25–35% smaller than JPEG at the same quality
- ✅ 26% smaller than PNG for lossless images
- ✅ Supports transparency (unlike JPEG)
- ✅ Supported by 97%+ of browsers worldwide
- ✅ Works for photos, graphics, logos, and thumbnails
- ✅ Directly improves Google Core Web Vitals (LCP)
- ✅ Free to convert — no software needed
If your site is still serving JPEG and PNG images, switching to WebP is one of the highest-impact performance improvements you can make. It takes minutes, it's free, and the results are immediate.