WebP vs AVIF: Which Image Format Should You Choose?

Both WebP and AVIF promise smaller file sizes than JPEG and PNG. But they're not interchangeable. Here's a practical breakdown of when to use each.

The Quick Answer

• Use WebP if you need broad browser support and fast encoding
• Use AVIF if you need the smallest possible file size and can accept slower encoding
• Use both with the <picture> element for the best of both worlds

File Size Comparison

At equivalent visual quality:

Format	Relative Size	Notes
JPEG	100% (baseline)	Universal support
WebP	~70% of JPEG	Good compression, fast encoding
AVIF	~50% of JPEG	Best compression, slower encoding
PNG	200-500% of JPEG	Lossless only, best for graphics

AVIF consistently produces smaller files than WebP — typically 20-30% smaller at the same visual quality.

Browser Support (2026)

WebP: Supported everywhere. Chrome, Firefox, Safari, Edge, and all mobile browsers. Effectively universal.

AVIF: Supported in Chrome, Firefox, Edge, and Safari 16+. Coverage is above 95% of users globally. Safe to use with a JPEG or WebP fallback.

Encoding Speed

This matters if you're batch processing hundreds of images:

• WebP encoding is fast — comparable to JPEG
• AVIF encoding is significantly slower — 5-10x slower than WebP

In Konvrt's batch processor, you'll notice AVIF batches take noticeably longer. If processing time matters, WebP is the pragmatic choice.

Quality Characteristics

WebP handles photographs well and produces clean results at quality 80+. It can show slight blurring at lower quality settings.

AVIF preserves fine detail better at low quality settings. It's particularly good at maintaining sharp text and edges in mixed-content images.

Both formats support transparency (alpha channel), unlike JPEG.

When to Use WebP

• General-purpose web images
• E-commerce product photos
• Social media content
• When encoding speed matters
• When you need a single format that works everywhere

When to Use AVIF

• Hero images and key visuals where file size is critical
• Photography portfolios where quality at small sizes matters
• Mobile-first sites where bandwidth savings compound
• As a progressive enhancement alongside WebP fallback

Using Both with Picture Element

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

The browser picks the first format it supports. Users with modern browsers get AVIF, older browsers fall back to WebP, and the oldest browsers get JPEG.

Converting with Konvrt

To convert images to either format:

1. Drop your file on the converter
2. Select WebP or AVIF as the output format
3. Adjust quality (start at 80 and compare)
4. Convert and compare file sizes

For bulk conversions, use the batch processor — set your format once and apply it to all files.