Output format
90%
Resize
Convert WEBP to AVIF Online Free — Fast Batch Conversion
How to Convert Images Online
1Upload your WebP file
Click upload or drag and drop your WebP file.
2Select AVIF output
Choose AVIF as the output format.
3Download AVIF
Click Convert and download your optimized AVIF file.
Supported Image Formats
WebP
Modern image format by Google. Up to 30% smaller than JPG with the same quality.
AVIF
Next-gen format with excellent compression. Up to 50% smaller than JPG.
HEIC
Apple photo format used by iPhone and iPad. High quality with small file size.
HEIF
High Efficiency Image Format — same as HEIC, used on Apple devices.
PNG
Lossless format that preserves every pixel. Best for screenshots and logos.
JPG
Universal format for photos. Supported everywhere, great balance between quality and file size.
GIF
Classic format for simple animations. Supports transparency and up to 256 colors.
BMP
Uncompressed bitmap format. Maximum quality but very large file size.
TIFF
Professional lossless format used in printing and photography.
PPM
Portable Pixmap format used in Unix/Linux environments.
HDR
High Dynamic Range format storing extended brightness data.
FITS
Flexible Image Transport System used in astronomy and science.
PDF
Portable Document Format. Convert PDF pages to JPG, PNG or WebP images.
AVIF vs WebP vs HEIC vs JPG
Quick comparison to help you choose the right format
AVIF
- Size: Up to 50% smaller than JPG
- Browsers: Chrome, Firefox, Safari
- Transparency: ✓
- Best for: Web performance
WebP
- Size: 25-35% smaller than JPG
- Browsers: All modern browsers
- Transparency: ✓
- Best for: Web compatibility
HEIC
- Size: ~50% smaller than JPG
- Browsers: Safari only
- Transparency: ✓
- Best for: iPhone storage
JPG
- Size: Baseline
- Browsers: All browsers & apps
- Transparency: ✗
- Best for: Universal sharing
Frequently Asked Questions
- How much smaller will my AVIF be compared to WebP?
- For photographs, typically 20–35% smaller at equivalent perceptual quality. Krunkit's 2026 benchmark found AVIF averaging 32% smaller than WebP for photographic content. For flat graphics and simple illustrations, the difference is smaller and WebP may occasionally match AVIF.
- Is AVIF supported by all browsers?
- AVIF is supported by Chrome 85+, Firefox 93+, Safari 16+, and Edge 121+ — covering approximately 95% of global browser traffic as of 2026. The remaining ~5% includes older iOS Safari and legacy browsers. Use the HTML picture element with WebP as fallback for complete coverage.
- Does AVIF support transparency like WebP?
- Yes. AVIF supports full alpha channel transparency, just like WebP. Transparent backgrounds, cutout images, and logos convert cleanly from WebP to AVIF with transparency fully preserved.
- Will converting WebP to AVIF affect quality?
- Minimal quality difference at high quality settings. AVIF uses lossy compression by default, so some image data is re-encoded. Convertify converts at high quality settings to minimize visible differences. The resulting AVIF will be smaller than the original WebP with imperceptible quality loss for most images.
- Can I convert multiple WebP files to AVIF at once?
- Yes. Convertify supports batch conversion — upload up to 10 WebP files and download them all as AVIF simultaneously.
- Should I use AVIF or WebP for my website?
- Use both. Serve AVIF to the ~95% of browsers that support it, with WebP as automatic fallback for the rest, using the HTML picture element or a CDN that negotiates format based on the Accept header. AVIF delivers better compression; WebP ensures compatibility.
- Why is AVIF encoding so slow?
- AVIF uses the AV1 codec, which is computationally intensive. Encoding a single image takes 1–48 seconds versus ~90 ms for WebP, depending on quality settings and encoder. For pre-encoded static files on a website, this is a one-time cost. For real-time pipelines, WebP remains the practical choice.
- Does AVIF support HDR?
- Yes. AVIF supports 10-bit color depth and HDR content, unlike WebP which is limited to 8-bit color. This makes AVIF the better format for high-quality photography and display-ready images on HDR screens.
Why convert WebP to AVIF?
WebP was Google's answer to JPEG in 2010 — achieving 25–35% better compression at equivalent quality. AVIF, finalized in 2019 and built on the AV1 video codec, takes compression further: 20–35% smaller files than WebP for photographs at matched perceptual quality. As of 2026, AVIF is supported by Chrome 85+, Firefox 93+, Safari 16+, and Edge 121+, covering approximately 95% of global browser traffic. Converting WebP to AVIF reduces bandwidth, improves Core Web Vitals LCP scores, and delivers visually superior results at lower quality settings — AVIF at quality 60–70% matches WebP at quality 90% perceptually while producing a significantly smaller file.
WebP vs AVIF: compression and support
| Feature | WebP | AVIF |
|---|---|---|
| Compression vs JPEG | ~30% smaller | ~50% smaller |
| Compression vs each other | Baseline | 20–35% smaller for photos |
| Browser support (2026) | ~97% | ~95% (Chrome, Firefox, Safari, Edge) |
| Encoding speed | ~90 ms/image (fast) | 1–48 seconds/image (slow) |
| Decoding speed | ~12 ms | ~18 ms (slightly slower) |
| HDR / wide-gamut | No | Yes (10-bit color) |
| Lossless mode | Yes | Yes |
| Animation | Fully supported | Supported (varies by browser) |
| Photoshop support | CC 2021+ native | v26.8+ (June 2025) native |
| Best for | Fast encoding, broad compatibility | Maximum compression, web delivery |
Compression benchmarks: how much smaller is AVIF?
Multiple independent studies quantify AVIF's advantage. Krunkit's 2026 benchmark encoding matched-quality images from a 4.1 MB JPEG source found AVIF averaged 32% smaller than WebP for photographs — 1.07 MB average for AVIF versus 1.58 MB for WebP. At low quality, AVIF files were 35% smaller (58 KB vs 89 KB); at high quality, 32% smaller (348 KB vs 512 KB). Daniel Aleksandersen's 600-image DSSIM-normalized study found AVIF achieved 50.3% median savings over JPEG versus WebP's 31.5% — roughly 27 percentage points of additional compression. Netflix's research confirmed AVIF as 'the most compressed image format to date' with dramatically fewer blocking artifacts. Imgix reports that Unsplash achieved a 30% file-size decrease switching from WebP to AVIF, while OneFootball saw 26% faster page loads and 24% faster Time to Interactive.
AVIF encoding speed: the main trade-off
AVIF's compression advantage comes at a cost: encoding is 12–47× slower than WebP at default settings. Encoding a 1920×1080 image takes ~90 ms with WebP versus ~4.2 seconds with AVIF at speed 6 (default), and up to 48 seconds at maximum quality (speed 0). This matters for real-time pipelines — user upload conversion, dynamic thumbnails, edge CDN processing — where WebP's speed is essential. For pre-encoded static assets on a website, AVIF's encoding time is a one-time cost paid at deploy time, not at serve time. The recommended approach: encode AVIF offline for static files, use WebP for anything generated on-the-fly. Among AVIF encoders, SVT-AV1 is roughly 2× faster than libaom and scales aggressively across CPU cores, making it the best choice for bulk conversion.
Browser support and the picture element fallback
AVIF is supported in Chrome 85+ (August 2020), Firefox 93+ (October 2021), Safari 16+ (September 2022), and Edge 121+ (2024) — covering ~95% of global browser traffic. The ~5% gap includes iOS 15 and earlier, legacy browsers, and some embedded environments. The standard implementation uses the HTML picture element to serve AVIF with WebP fallback: provide AVIF as the first source and WebP as the second, with JPEG as the final fallback. Browsers download only the first format they support. This approach lets you serve AVIF to the 95% who can use it while ensuring the remaining 5% receive WebP — which is exactly why having both formats is the production best practice, not a choice between them.
Core Web Vitals: AVIF's impact on LCP
Largest Contentful Paint (LCP) measures how quickly the main visible image loads. AVIF files are typically 30–40% smaller than equivalent WebP files for photographs, directly reducing LCP time. Google PageSpeed Insights explicitly flags images as candidates for next-gen formats — AVIF is the highest-scoring recommendation. For e-commerce sites where product photos are the LCP element, switching hero images from WebP to AVIF can reduce LCP by 200–500 ms on mobile connections, depending on image size and network speed. AVIF does not support progressive rendering (unlike progressive JPEG), so the full file must download before anything displays — this means smaller file size has a direct, linear impact on time-to-first-display, making compression gains more valuable than with progressive formats.
CDN and toolchain support for AVIF in 2026
Cloudinary, Imgix, and Cloudflare Image Resizing all support AVIF auto-delivery based on browser Accept headers. Imgix made AVIF its default for auto=format in December 2021. Cloudflare Polish does not support AVIF (only WebP), but Cloudflare Image Resizing does. BunnyCDN does not support AVIF. On the software side, Photoshop added native AVIF open/edit/save in June 2025 (v26.8); Lightroom added AVIF export in October 2023. GIMP has supported AVIF since 2020. Figma and Sketch do not natively support AVIF. Sharp (Node.js libvips) and ImageMagick (7.0.25+) both handle AVIF encoding, with Sharp's documentation noting that high-effort AVIF encoding can take 30+ seconds for large images.
How Convertify converts WebP to AVIF
Convertify uses a Rust backend with libvips for WebP to AVIF conversion. libvips processes images in streaming pipelines without loading the entire file into memory, keeping conversion fast even for large WebP files. Transparency from WebP's alpha channel is preserved in the AVIF output — both formats support full alpha transparency. Color profiles are maintained. Files are processed server-side over an encrypted HTTPS connection and deleted immediately after download. No account required, no file size limits beyond practical constraints.