Choosing the wrong image format costs you in file size, visual quality, or compatibility — sometimes all three. JPEG, PNG, and WebP each have distinct strengths, and knowing when to use each one is one of the most impactful decisions you can make for a fast website.
The Short Answer
| Use case | Best format |
|---|---|
| Photos on a website | WebP (or JPEG if WebP not possible) |
| Logos and icons with transparency | WebP lossless (or PNG) |
| Screenshots with text | PNG or WebP lossless |
| Photos for email | JPEG |
| Animated images | WebP (or GIF for compatibility) |
JPEG: The Workhorse
JPEG has been the dominant format for photographs since the early 1990s. It uses lossy compression — it discards pixel data to achieve small file sizes.
✓ Strengths
- Universally supported
- Excellent for photos and gradients
- Adjustable compression (quality 1–100)
- Very small files at quality 70–85
✗ Weaknesses
- Quality loss every resave
- No transparency support
- Blocky artifacts below quality 60
- Less efficient than WebP
Typical file size: 1200×800 photo at quality 80 ≈ 80–150KB
PNG: The Precision Format
PNG uses lossless compression — no pixel data is discarded. Perfect for images where sharpness matters at the edge level: text, logos, line art, screenshots.
✓ Strengths
- Pixel-perfect lossless reproduction
- Full transparency (alpha channel)
- No quality loss on resave
✗ Weaknesses
- Large file sizes for photos (3–5× JPEG)
- Not as efficient as WebP lossless
Typical file size: 1200×800 photo as PNG ≈ 800KB–2MB
WebP: The Modern Standard
WebP supports both lossy and lossless compression, transparency, and animation — combining the best of JPEG and PNG in a more efficient format. Global browser support is approximately 97% as of 2025.
WebP is 25–34% smaller than JPEG at equivalent quality. Google’s PageSpeed Insights flags JPEG and PNG images and recommends switching to WebP.
Side-by-Side Comparison (1200×800 photograph)
| Format | File size | Transparency | Quality |
|---|---|---|---|
| JPEG (quality 85) | ~130KB | No | Very good |
| JPEG (quality 70) | ~80KB | No | Good |
| PNG | ~900KB | Yes | Perfect |
| WebP lossy (quality 80) | ~95KB | No | Very good |
| WebP lossless | ~650KB | Yes | Perfect |
How to Convert Between Formats
Convert any image between JPEG, PNG, and WebP using AllMediaTools Image Converter — free, online, no software install. To compress and convert in one step, use AllMediaTools Image Compressor.
Frequently Asked Questions
Should I convert my entire website to WebP?
Yes, for new or overhauled sites. Use the <picture> element with a JPEG fallback for older browser compatibility. Many CDNs including Cloudflare serve WebP automatically based on the browser’s Accept headers.
Does WebP look worse than JPEG?
No — at comparable quality settings, WebP actually looks slightly better. The compression algorithm is more modern, producing fewer “blocky” artifacts around sharp edges.
Can Photoshop open WebP files?
Native WebP support was added in Photoshop 23.2 (2022). GIMP and Affinity Photo support it natively. Older Photoshop versions need Google’s free WebP plugin.
Which format does Google recommend?
Google explicitly recommends WebP in its PageSpeed documentation. PageSpeed Insights flags JPEG and PNG as “serve images in next-gen formats” opportunities.