WebP vs JPG vs PNG: Which Image Format Should You Use?
A practical guide to choosing between WebP, JPG, and PNG for websites, apps, and everyday use. Includes file size comparisons and when each format wins.
Choosing the wrong image format can double your page load time or degrade photo quality. Here is a practical breakdown of when to use WebP, JPG, and PNG — and how to convert between them for free.
Quick Reference
| Format | Best For | Transparency | File Size |
|---|---|---|---|
| JPG | Photos, complex images | No | Medium |
| PNG | Screenshots, logos, text | Yes | Large |
| WebP | Web images (everything) | Yes | Smallest |
| AVIF | Next-gen web images | Yes | Smallest |
| HEIC | iPhone photos | No | Small |
JPG (JPEG)
JPG is the universal format for photographs. It uses lossy compression — it discards some visual information to achieve smaller file sizes. The discarded information is chosen to minimize visible quality loss.
Use JPG when:
- Sharing photos via email or messaging apps
- Storing photos where universal compatibility matters
- Working with older software that may not support WebP
Avoid JPG when:
- You need a transparent background (logos, stickers)
- You’re saving screenshots with sharp text (PNG is sharper)
- You’re editing and re-saving multiple times (each save degrades quality)
Typical JPG sizes: a 12MP smartphone photo is ~3–5MB as JPG.
PNG
PNG uses lossless compression — every pixel is preserved exactly. This makes PNG ideal for images with sharp edges, text, or transparency.
Use PNG when:
- You need a transparent background (product cutouts, logos, UI elements)
- The image contains text, diagrams, or screenshots
- Quality must be perfect (design assets, icons)
Avoid PNG when:
- You’re storing photographs (JPG will be 60–80% smaller with near-identical quality)
- File size matters for web performance
Typical PNG sizes: a screenshot of a webpage is 500KB–3MB as PNG, vs 100–400KB as JPG.
WebP
WebP was developed by Google as a modern replacement for both JPG and PNG. It offers:
- 25–35% smaller than JPG at equivalent quality (for photos)
- Supports transparency like PNG but typically at smaller file sizes
- Lossy and lossless modes in one format
Use WebP when:
- Serving images on a website (all modern browsers support it)
- You want the smallest file size without quality loss
- You need transparency but want smaller files than PNG
Compatibility: Chrome, Firefox, Safari 14+, Edge all support WebP. Not supported in older apps, email clients, or Windows before 2021 (without codec).
AVIF
AVIF is the newest format, offering even better compression than WebP — typically 30–50% smaller than JPG at equivalent quality. Based on the AV1 video codec.
Browser support is growing: Chrome 85+, Firefox 93+, Safari 16+. Use AVIF as a <picture> element fallback to JPG for maximum compatibility.
Practical Recommendations
For websites and web apps
Use WebP as your primary format. It balances quality, size, and near-universal browser support. Provide JPG fallbacks using <picture> for older browsers.
<picture>
<source srcset="image.webp" type="image/webp">
<img src="image.jpg" alt="Description">
</picture>For photography and sharing
Use JPG at 80–90% quality. It opens in everything and the file size is manageable.
For logos and design assets
Use PNG if you need transparency. Use SVG if the image is vector-based (logos, icons).
For e-commerce product photos
Use WebP on your website (for speed), PNG with transparent background for marketplace uploads (Amazon, Etsy).
How to Convert Between Formats
OneConvertly can convert between formats for free, directly in your browser:
- PNG to JPG — Convert PNG screenshots or designs to smaller JPG
- WebP to JPG — Convert WebP to universal JPG format
- HEIC to JPG — Convert iPhone HEIC photos to JPG
- AVIF to JPG — Convert next-gen AVIF to JPG
- Compress Image — Compress JPG, PNG, or WebP, with optional WebP output
All conversions happen in your browser — no upload, no account required.
File Size Comparison (Same Image, Different Formats)
For a typical 12MP smartphone photo:
| Format | File Size | Quality |
|---|---|---|
| PNG | ~8MB | Lossless |
| JPG (90%) | ~3MB | Excellent |
| JPG (80%) | ~1.8MB | Very good |
| WebP (90%) | ~2MB | Excellent |
| WebP (80%) | ~1.2MB | Very good |
| AVIF (80%) | ~0.9MB | Very good |
WebP at 80% quality gives you file sizes ~35% smaller than JPG at the same quality level.
Frequently Asked Questions
Should I convert my entire image library to WebP? If you’re serving images on a website, yes — the bandwidth savings are significant. For personal archives, keep originals as JPG/PNG and export WebP only for web use.
Does converting JPG to WebP improve quality? No. Converting from a lossy format (JPG) to another format cannot recover lost quality. You can reduce file size, but you cannot improve quality beyond the original.
Will WebP replace JPG? Gradually, yes. AVIF may eventually replace both. But JPG will remain important for compatibility for many years.
Convert your images for free: WebP to JPG → · PNG to JPG → · Compress Images →