JPG vs PNG vs WebP vs AVIF: Which Image Format Should You Use?

Choosing the right image format can significantly impact your website's performance and visual quality. With multiple formats available, it's not always clear which one to use.

This guide breaks down the strengths and weaknesses of each format to help you make the right choice.

Quick Decision Guide

Need a quick answer? Here's when to use each format:

• JPEG: Photographs and complex images with many colors
• PNG: Graphics with transparency, logos, screenshots
• WebP: General purpose, best balance of quality and size
• AVIF: Maximum compression when browser support allows
• GIF: Simple animations (consider video for complex ones)
• SVG: Logos, icons, and illustrations that need to scale

Relative File Sizes for the Same Photo

JPEG (JPG)

What It Is

JPEG (Joint Photographic Experts Group) has been the web standard for photographs since the 1990s.

Pros

• Universal support - Works everywhere
• Small file sizes for photographs
• Adjustable quality - Fine-tune the compression
• Good for complex images with many colors and gradients

Cons

• Lossy compression - Quality degrades with each save
• No transparency support
• Visible artifacts at high compression
• Not ideal for text or sharp edges

Best For

• Photographs
• Complex images with gradients
• Images without transparency needs
• Maximum compatibility required

Recommended Quality Settings

• High quality display: 85-95%
• General web use: 75-85%
• Thumbnails: 60-75%

PNG (Portable Network Graphics)

What It Is

PNG was created as a patent-free alternative to GIF, offering lossless compression and transparency.

Pros

• Lossless compression - No quality loss
• Full transparency support (alpha channel)
• Sharp edges preserved perfectly
• Great for screenshots and graphics

Cons

• Large file sizes for photographs
• Overkill for simple images without transparency
• Slower loading than optimized JPEGs

PNG Variants

• PNG-8: 256 colors, smaller files, limited transparency
• PNG-24: Millions of colors, full transparency, larger files

Best For

• Logos and graphics with transparency
• Screenshots and UI elements
• Images with text overlay
• Graphics with solid colors and sharp edges

WebP

What It Is

Developed by Google, WebP combines the best of JPEG and PNG with modern compression. See the official WebP project page and Can I Use's WebP support data for current browser coverage.

Pros

• 25-35% smaller than JPEG at same quality
• Supports transparency like PNG
• Supports animation like GIF
• Both lossy and lossless modes
• Excellent browser support (96%+ globally)

Cons

• Not universal - Some older software doesn't support it
• May need fallbacks for maximum compatibility
• Encoding can be slower than JPEG

Browser Support (2026)

• Chrome: Full support
• Firefox: Full support
• Safari: Full support (iOS 14+, macOS Big Sur+)
• Edge: Full support

Best For

• General web use (photos and graphics)
• When file size matters
• Modern websites without legacy requirements

AVIF

What It Is

AVIF (AV1 Image File Format) is the newest format, offering exceptional compression from video codec technology. Background: MDN's AVIF reference and Can I Use's AVIF browser-support tracker.

Pros

• 50% smaller than JPEG at same quality
• 20% smaller than WebP
• Excellent quality at very low file sizes
• HDR support for wide color gamut
• Transparency and animation supported

Cons

• Limited browser support (~90%, growing)
• Slow encoding compared to other formats
• Not yet universal - needs fallbacks
• Patent concerns (though royalty-free)

Browser Support (2026)

• Chrome: Full support
• Firefox: Full support
• Safari: Partial support (iOS 16+, macOS Ventura+)
• Edge: Full support

Best For

• Cutting-edge performance optimization
• High-quality photography sites
• When maximum compression is needed
• Users comfortable providing fallbacks

Format Comparison Table

| Feature | JPEG | PNG | WebP | AVIF | |---------|------|-----|------|------| | Compression | Lossy | Lossless | Both | Both | | Transparency | ❌ | ✅ | ✅ | ✅ | | Animation | ❌ | ❌ | ✅ | ✅ | | File Size | Medium | Large | Small | Smallest | | Browser Support | 100% | 100% | 96% | 90% | | Best For | Photos | Graphics | General | Maximum compression |

File Size Comparison (Same Visual Quality)

Here's a real example with a 1920×1080 photograph:

| Format | File Size | Reduction vs JPEG | |--------|-----------|-------------------| | JPEG (80%) | 245 KB | — | | PNG | 1.8 MB | -635% (larger) | | WebP | 178 KB | 27% smaller | | AVIF | 125 KB | 49% smaller |

Implementing Multiple Formats

For maximum compatibility and performance, serve multiple formats:

<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Description">
</picture>

The browser automatically chooses the best supported format.

When to Use Each Format: Decision Tree

1. Is it a logo or icon that needs to scale? → SVG
2. Does it need transparency?
   • Yes, simple transparency → PNG-8 or WebP
   • Yes, complex transparency → PNG-24 or WebP
3. Is it a photograph?
   • Maximum compatibility → JPEG
   • Better compression → WebP
   • Cutting-edge → AVIF with fallbacks
4. Is it a simple animation? → WebP or AVIF
5. Is it a complex animation? → Consider video (MP4/WebM)

Converting Between Formats

Our Format Converter makes it easy to convert between JPEG, PNG, WebP, and AVIF. Simply upload your image and choose your target format.

For batch conversions, use our Batch Processing tool to convert your entire image library at once.

Related Reading

• WebP format deep-dive — browser support, quality settings, fallback strategy.
• Compress images without losing quality — once you've picked a format, the compression settings determine the actual file size.
• Image SEO: how format and compression affect rankings — Core Web Vitals impact and Google's image-format preferences.
• How to convert HEIC to JPG — the format gotcha specific to iPhone photos.