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WebP vs AVIF: Which Modern Image Format Should You Use?

By PixNimbus Editorial · Reviewed & edited by Franklin Brown ·July 4, 2026

The Short Answer

Use both. Serve AVIF to browsers that support it and WebP to everyone else, and let the delivery layer decide per request. But to understand why that is the right default - and when you might deliberately pick just one - it helps to know how the two formats actually differ.

What Each Format Is Good At

WebP, from Google, has been broadly supported since around 2020. It compresses noticeably better than JPEG (commonly 25-35% smaller at the same visual quality), supports transparency and animation, and encodes fast. Its ubiquity is its superpower: every current browser reads it, so a single WebP file is a safe universal upgrade over JPEG and PNG.

AVIF, derived from the AV1 video codec, is the harder compressor. At the same quality it frequently lands 20-40% smaller than WebP, handles gradients and flat color regions with fewer artifacts, and supports wide color gamut and HDR. The trade-offs: encoding is slower and more CPU-intensive, and while support is now strong across modern browsers, it arrived later than WebP.

When to Prefer One Over the Other

• Photographs and rich gradients - AVIF usually wins clearly. Skies, skin tones, and soft gradients that make WebP band tend to stay clean in AVIF.
• Maximum compatibility with zero fallback logic - WebP. If you must ship exactly one file and cannot negotiate, WebP is decoded by the widest set of browsers today.
• Large batches encoded on a schedule - WebP’s faster encode can matter when you are processing thousands of images and encode time is a real cost.
• Small UI assets, icons, simple graphics - the difference is often negligible; pick whichever your pipeline already produces.

The Best Move: Don’t Choose Per File

Hard-coding one format per image means either shipping AVIF that some visitor cannot read, or leaving compression on the table by defaulting everyone to WebP. Content negotiation removes the dilemma. When you host on PixNimbus and request format=auto, the CDN reads the browser’s Accept header and serves AVIF when the browser advertises it, WebP when it does not, and the original as a final fallback. One <img src>, best format per visitor, no <picture> gymnastics.

Quality Settings Matter More Than the Format

A poorly chosen quality value wipes out the format’s advantage. Both WebP and AVIF are tuned with a q value from 1 to 100. For most web photography, quality 70-80 is the sweet spot: files shrink dramatically with no loss the eye can catch at display size. Push to 85-95 for hero imagery you want pristine; drop to 40-60 for thumbnails where size is king. With PixNimbus you set this straight in the URL - ?format=avif&q=72 - and can compare variants instantly.

Try It Yourself

The fastest way to build intuition is to encode the same photo both ways and look. The Quick Image Compressor re-encodes to WebP in your browser with a live size readout, and the Image CDN lets you flip between AVIF, WebP, and JPEG on a hosted image by changing one query parameter. Compare the numbers and the pixels on your own images, and the right default - auto negotiation with a sensible quality - will be obvious.

Our articles are drafted with AI assistance and reviewed, fact-checked, and edited by a human editor before publishing.