Convert WebP to AVIF Online — Next-Gen Compression
10-40% smaller files. Faster load times. Better Core Web Vitals.
Drop up to 50 images at once — no install, no sign-up required.
Drop WebP Files Here
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How it works
- 1 · Drop your files
Drag & drop or choose WebP files. No account required on Free—paid plans unlock bigger batches, higher limits, and priority queues.
- 2 · We convert securely
Processed on our dedicated servers. Encrypted in transit & at rest. Metadata stripped by default. We never store filenames—only file types & sizes for accounting. We never train AI models on uploads.
- 3 · Download & auto-delete
Grab your AVIF files in seconds. Files delete automatically after 1 hour. Delete anytime after downloading with one click.
WebP is Google's modern image format offering both lossy and lossless compression modes, plus alpha transparency and animation support—essentially combining the best features of JPEG, PNG, and GIF. Announced in 2010, WebP typically delivers 25-35% smaller files than JPEG at comparable quality using VP8 or VP8L compression. All major browsers now support WebP, making it a practical choice for web optimization.
Learn more: WebP Documentation (Google)
WebP strikes an excellent balance between compression efficiency and ecosystem maturity. It's widely adopted for web delivery, supported across all modern browsers (Chrome 32+, Firefox 65+, Safari 14+, Edge 18+), and offers better compression than JPEG/PNG without the encoding overhead of AVIF.
CMS support: WordPress 5.8+ (July 2021) supports WebP natively. Most modern CMS platforms and CDNs (Cloudflare, Akamai, Fastly) can automatically serve WebP to compatible browsers via content negotiation.
Email limitation: Most email clients (Outlook, Gmail web, Apple Mail) do not support WebP. Always use JPG or PNG for email images, or provide a JPG fallback via <picture> elements in HTML emails.
AVIF (AV1 Image File Format) leverages the AV1 video codec to deliver next-generation compression—typically 50% smaller than JPEG at equivalent quality, with support for HDR, wide color gamut, and both lossy and lossless compression. Standardized by the Alliance for Open Media in 2019, AVIF offers 10-bit and 12-bit color depth plus full alpha transparency. Encoding is slower than JPEG or WebP, but visual quality per byte is exceptional.
Authoritative reference: AVIF Specification (AOMedia)
AVIF is ideal for modern web delivery where cutting-edge compression and HDR support matter. Browser adoption reached critical mass in 2021-2023, with Chrome 85+, Firefox 93+, and Safari 16.4+ now supporting AVIF natively. Encoding is 2-3× slower than WebP, but the compression gains typically justify the extra CPU time for server-side batch processing. For maximum compatibility, serve AVIF with WebP and JPG fallbacks using <picture> elements.
Frequently Asked Questions
Why convert WebP to AVIF?
AVIF offers 10-40% smaller files than WebP at equivalent visual quality. This translates to:
- Faster page loads: Smaller files = quicker downloads
- Lower bandwidth costs: Significant savings at scale
- Better Core Web Vitals: Improved LCP and overall performance scores
- Next-gen compression: AVIF uses the AV1 codec, more efficient than WebP's VP8/VP9
Will my file size decrease?
Yes! AVIF files are typically 10-40% smaller than WebP at equivalent visual quality.
Examples:
- 1 MB WebP → 600-900 KB AVIF
- 5 MB WebP → 3-4.5 MB AVIF
The savings depend on image content—photos with complex textures see the largest reductions.
What happens to transparency in my WebP?
Transparency is fully preserved. AVIF supports alpha channels just like WebP.
- WebP with transparency → AVIF with transparency
- WebP without transparency → AVIF without transparency (smaller file)
AVIF actually supports even higher bit-depth transparency (10-bit/12-bit) than WebP's 8-bit alpha.
Is the quality loss noticeable?
Minimal to none. We use AVIF quality 80 (CRF 28), which is perceptually equivalent to the WebP source for most images.
- Optimized for web viewing where file size matters
- Quality loss is imperceptible at normal viewing distances
- Color accuracy and detail preserved
What about browser support for AVIF?
AVIF has 93%+ global browser support (as of 2024):
- Supported: Chrome 85+, Firefox 93+, Safari 16.4+, Edge 121+
- Not supported: IE11, older Safari, some older mobile browsers
Use the <picture> element with AVIF as the primary source and WebP/JPG as fallbacks for maximum compatibility.
When should I keep WebP instead?
WebP may be better when:
- Maximum compatibility needed: WebP has 97%+ browser support vs AVIF's 93%
- Encoding speed matters: WebP encodes faster than AVIF
- Animation required: WebP animation is more widely supported
For most modern web use cases, AVIF's superior compression outweighs these trade-offs.
What happens to animated WebP files?
Animated WebP becomes animated AVIF. All frames are converted with AV1 compression for excellent file size reduction.
Note: Due to current AVIF encoder limitations, animation metadata may not be fully preserved:
- Frames: All frames are preserved in original order
- Loop count: Output always loops infinitely (finite loop counts not preserved)
- Frame timing: Individual frame delays may not be preserved
For full animation metadata preservation, consider keeping animated content as WebP, or use WebP to GIF which preserves all timing information.
What are the limits for this converter?
| Tier | Max File Size | Max Files/Batch | Parallel Processing |
|---|---|---|---|
| Free | 25 MB | 50 files | 3 at once |
| Pro | 200 MB | 200 files | 6 at once |
| Business | 1024 MB | 1000 files | 10 at once |
Note: File size limits are specific to this converter. Batch and parallel processing limits apply to all images converters site-wide. See all converter limits →
How are credits calculated for this conversion?
Cost: 1 credit each
How it works:
- Files up to 25 MB: 1 credit (minimum)
- 26-50 MB: 2 credits
- 51-75 MB: 3 credits
- 76-100 MB: 4 credits
- Over 1000 MB: 40 credits (maximum cap)
Example: A 5 MB image = 1 credit. A 95 MB image = 4 credits.
Why per-megabyte? Larger files require more resources (processing, bandwidth, storage).
What are my daily and monthly credit limits?
Credit allocations vary by account tier:
| Tier | Daily Limit | Monthly Limit |
|---|---|---|
| Free | 50 credits/day | — |
| Pro | — | 10,000 credits/month |
| Business | — | 30,000 credits/month |
Daily credits (Free tier, including guests) reset every day at midnight UTC. Monthly credits (Pro & Business) reset on your billing cycle date.
Note: With 1 credit each, images under 25 MB cost 1 credit each. Pro users can convert 10,000 images per month.
Answers at a Glance
Quick answers to common questions.
- Are my files secure?
- How long do you keep my files?
- What metadata do you keep?
- What happens after I drop a file?
- Why are conversions so fast?
- How do you measure performance?
- What are the exact limits for each plan?
- Can I process files in bulk?
- Why did my file fail to convert?
- Do you use my files to train AI?
What's New in WebP to AVIF
Latest improvements to this converter
Initial launch of WebP to AVIF converter with cutting-edge AV1 compression for 20-40% additional file size reduction.
Choose Your Plan
Limits shown for WebP to AVIF conversion. One subscription unlocks the entire Tools.FAST Network. Plans cover Convert.FAST, Compress.FAST, PDF.FAST (soon), and all future tools.
Free
For occasional personal use
- 25 MB per file
- 50 files per batch
- 3 parallel conversions
- 50 credits/day
- Standard priority
- Email support
No sign-up required. Create an account for your own credit pool.
Pro
For independent work
- 200 MB per file
- 200 files per batch
- 6 parallel conversions
- 10,000 credits/month across Tools.FAST
- High priority
- Email & chat support
- One subscription for the entire Tools.FAST network
Business
For production scale
- 1 GB per file
- 1000 files per batch
- 10 parallel conversions
- 30,000 credits/month across Tools.FAST
- Add seats to invite team members
- Highest priority
- Priority email & chat support
- One subscription for the entire Tools.FAST network
How Credits Work
- Usually 1 credit per conversion. Exact cost shown before you start.
- Credits refresh monthly on your billing cycle.
- Unused credits roll over, capped at your plan's monthly amount.
- One subscription, all sites. Works across Convert.FAST, Compress.FAST, and future tools.