Every web developer has faced this question: should this image be a JPEG, PNG, or WebP? The wrong choice can mean files 5–20× larger than necessary. Here's a definitive, data-backed guide.
At a Glance
| Feature | JPEG | PNG | WebP |
|---|---|---|---|
| Compression | Lossy only | Lossless | Both |
| Transparency | ❌ No | ✅ Alpha | ✅ Alpha |
| Animation | ❌ No | ⚠️ APNG | ✅ Yes |
| Browser support | 100% | 100% | 97%+ |
| Photo file size | Baseline | 5–10× larger | 25–35% smaller |
| Graphic file size | Often ok | Baseline | 26% smaller |
| Best for | Email, legacy | Screenshots, logos | Everything web |
When to Use JPEG
JPEG remains the right choice when:
- Email newsletters — email clients have inconsistent WebP support
- Legacy CMS platforms that don't accept WebP uploads
- Social media uploads where the platform re-encodes anyway
For standard web use, JPEG has been effectively superseded by WebP.
When to Use PNG
PNG is ideal when you need:
- Pixel-perfect fidelity — screenshots with text that must remain sharp
- Transparency with hard edges — though WebP handles this too
- Source/archival copies — lossless means no quality degradation over time
Never use PNG for photographs. A photo saved as PNG can be 10–20× larger than the same image as WebP.
When to Use WebP
WebP is the correct default for almost all web images in 2026:
- Photos: 25–35% smaller than JPEG at equivalent visual quality
- Graphics: 26% smaller than PNG with full alpha transparency
- Animations: far smaller than GIF with better quality
With 97%+ global browser support, the compatibility argument against WebP is essentially gone.
Bottom line: If you're building a website today, make WebP your default. Use JPEG only for email and legacy compatibility. Use PNG only for screenshots or archival lossless copies.
Real-World Benchmarks
| Test Image | JPEG (q80) | PNG | WebP (q80) | WebP Saving vs JPEG |
|---|---|---|---|---|
| Landscape photo (1920×1080) | 285 KB | 2.1 MB | 195 KB | -32% |
| Product shot (800×800) | 95 KB | 520 KB | 62 KB | -35% |
| UI screenshot (1440×900) | 180 KB | 210 KB | 125 KB | -31% |
| Logo with transparency | N/A | 45 KB | 28 KB | -38% vs PNG |
🔧 Convert Between Formats — Free
Drop any JPEG, PNG, or WebP image and convert with quality control. Runs entirely in your browser — no upload required.
Open Compress Image →Conclusion
The JPEG vs PNG vs WebP debate has a clear winner for web use: WebP. It combines the best of both worlds — lossy compression like JPEG with transparency like PNG — in a format that's significantly smaller than either. Make it your default and you'll ship faster, lighter pages without sacrificing quality.