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

Choosing the right image format is one of the most impactful decisions you can make for web performance. The difference between formats can mean 50-90% smaller files with no visible quality loss.

The Four Formats

JPG (JPEG)

The original web photo format, created in 1992. Uses lossy compression — it discards data to reduce file size.

Compression: Good. Typically 10:1 reduction from raw. Transparency: Not supported. Animation: Not supported. Browser support: Universal — every browser, every device, every email client. Best for: Photos and images with many colors when maximum compatibility is needed.

PNG

Created in 1996 as a patent-free alternative to GIF. Supports lossless compression and full transparency.

Compression: Poor for photos (files are large), good for graphics. Transparency: Full alpha channel support. Animation: APNG supported in modern browsers. Browser support: Universal. Best for: Logos, icons, screenshots, graphics with text, any image needing transparency where file size is not critical.

WebP

Google's format from 2010. Supports both lossy and lossless compression, plus transparency.

Compression: 25-30% smaller than JPG at equivalent quality. Transparency: Supported in both lossy and lossless modes. Animation: Supported. Browser support: All modern browsers (Chrome, Firefox, Safari, Edge). No support in IE11 (end of life). Best for: Web images — the default recommendation for most websites today.

AVIF

Based on the AV1 video codec, standardized in 2019. The newest major image format.

Compression: 50% smaller than JPG at equivalent quality. 20% smaller than WebP. Transparency: Supported. Animation: Supported. Browser support: Chrome, Firefox, Safari (since version 16). Growing rapidly. Best for: Maximum compression without quality loss. Future-proofing your image pipeline.

Practical Comparison

Take a typical product photo at 1000x1000:

• ●PNG: ~3 MB (lossless)
• ●JPG at quality 85: ~250 KB
• ●WebP at quality 85: ~180 KB (28% smaller than JPG)
• ●AVIF at quality 85: ~120 KB (52% smaller than JPG)

Decision Guide

For Photos on the Web

Use WebP as your default. If you need maximum compression and your audience uses modern browsers, use AVIF. Fall back to JPG for email attachments and contexts where you cannot control the viewer's software.

For Logos and Graphics

Use PNG for your source files (lossless quality, transparency). Create WebP versions for web delivery.

For Transparency

Use WebP (best compression with transparency) or PNG (maximum compatibility with transparency). JPG does not support transparency at all.

For Email

Use JPG. Email clients have inconsistent format support. JPG is the only safe choice.

For Print

Use PNG or TIFF (not covered here but important for print). Web formats like WebP and AVIF are not widely supported in print workflows.

The Recommended Web Strategy

Serve WebP with a JPG fallback using the HTML picture element:

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

This gives AVIF to browsers that support it, WebP to the rest, and JPG to legacy browsers.

Converting with ImgGPT

ImgGPT's converter handles all four formats. Upload any image and output as PNG, JPG, WebP, or AVIF with adjustable quality settings. Batch-convert your entire image library to modern formats in minutes.

The right format choice, combined with proper compression, can reduce your website's image payload by 80-90%.