WebP vs AVIF in 2026: Which One Should You Actually Use?

Here’s the direct answer: use WebP. AVIF compresses better, but the trade-offs make it impractical for most real-world workflows in 2026.

If you want the full picture — when AVIF actually makes sense and why we think the balance will shift soon — read on.

What each format brings to the table

AVIF is the newer codec, built on top of the AV1 video standard (developed by a consortium that includes Google, Apple, Netflix, Amazon, and Mozilla). On real photographs at equivalent visual quality, AVIF files are typically 20–25% smaller than WebP. That’s a genuine, meaningful advantage.

WebP is the proven format. It encodes roughly 10× faster than AVIF, works in 97%+ of browsers — practically everything — and saves about 25–30% over JPG. It’s been in Photoshop, GIMP, Figma, and every major image CDN for years.

The problem with AVIF: encoding is expensive

A 20–25% size improvement sounds worth it — until you look at what it costs. Encoding a single 12 MP photo:

Format	Default speed	Quality-focused
WebP	~0.3 sec	~1 sec
AVIF	~3 sec	8–90 sec

That’s a 10× to 300× difference. Scale that up to a batch of 1000 photos:

• WebP: about 5 minutes on a 10-core laptop
• AVIF at minimum settings: about 50 minutes

If a server is doing the encoding, you pay for that CPU time. If the user’s browser is doing it — as with SciZone — a 30-second WebP batch turns into an hour-long wait. That’s not a trade-off users will accept for a 20% file size improvement.

Hardware acceleration for AV1 encoding exists on some newer chips, but it’s not widespread enough yet to close this gap.

Compatibility: close, but not the same

Both formats work in all modern browsers. But “modern” has edges:

• Older iOS Safari (before version 16) handles WebP but not AVIF
• In-app browsers — the one Gmail opens when you tap a link, or the one inside Slack — handle WebP reliably but are inconsistent on AVIF
• Various Android WebViews show the same pattern

WebP is at 97%+ global browser support. AVIF is at 94%+. For most sites that gap is acceptable. For anything that needs to work reliably on any device a visitor might use — including a five-year-old phone or a corporate intranet browser — WebP is the safer default.

The “serve both” option

If you want AVIF’s efficiency without giving up compatibility, the standard approach is a <picture> element with a fallback:

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

AVIF-capable browsers get the smaller file. Everyone else gets WebP. The <img> tag catches anything older.

The cost: you now need to encode, store, and serve three versions of every image. For a large content site with thousands of images, that’s real build time and real storage costs. For most projects, WebP alone gets you 95% of the benefit at a fraction of the complexity.

When AVIF is actually worth it

There are situations where AVIF makes sense:

• You’re on a CDN that handles AVIF encoding transparently — Cloudflare Images, imgix, and Next.js managed deployments can convert on-demand without you touching the encoding pipeline
• Your site has so many images that the extra 20% bandwidth saving translates to meaningful money
• Encoding happens on powerful servers where the CPU cost is acceptable

For local batch conversion, browser-based tools, or anyone who wants a pipeline that just works: WebP is the right choice.

What we use at SciZone

WebP, as the default. AVIF encoding is already compiled into our WASM binary — libaom is in there — but we haven’t exposed it to users yet because the encoding time makes large batches impractical. When hardware AV1 encoders are common enough to close the speed gap, we’ll add it. Until then, WebP delivers the better overall experience.

The bottom line

AVIF wins on paper. WebP wins in practice. For the vast majority of workflows in 2026, WebP is the right format: fast to encode, universally compatible, great tooling, and 25–30% smaller than JPG with no compatibility risk.

Ready to start converting: JPG to WebP, HEIC to WebP, or the bulk converter for large batches.