AVIF to WebP Converter
Convert AVIF images to WebP for the browsers and platforms that support WebP but not AVIF yet — transparency and quality preserved.
What Is AVIF?
AVIF (AV1 Image File Format) is a modern image format built on the AV1 video codec, developed by the Alliance for Open Media (AOMedia). It delivers roughly 50% smaller files than JPEG at comparable visual quality, and supports transparency, HDR, wide color gamut, and up to 12-bit color depth.
Browser support for AVIF is now strong — over 93% of browsers in use today can display it — but adoption across the wider web is still under 1% of sites, well behind the older, more established WebP format.
Why Convert to WebP?
WebP has been around for longer and has broader real-world support across content management systems, CDNs, image-optimization pipelines, and older browser versions that don't yet handle AVIF. If a platform you're publishing to accepts WebP but not AVIF, or you want a format with a longer compatibility track record while still keeping most of the file-size savings over JPEG or PNG, WebP is the practical middle ground.
How This Tool Works
This converter runs entirely in your browser using a real libavif decoder compiled to WebAssembly — the same underlying decode technology browsers use natively. Your AVIF file is decoded and re-encoded as a WebP entirely on your device, with any transparency preserved; it's never uploaded to any server. Larger or higher-resolution images take a little longer to process since AVIF decoding is more computationally intensive than older formats.
AVIF vs WebP — When to Use Each
| Feature | AVIF | WebP |
|---|---|---|
| File size | Generally smaller | Small, but usually larger than AVIF |
| Compression | Lossy or lossless | Lossy or lossless |
| Transparency | Supported | Supported |
| Animation | Supported | Supported |
| Color depth | Up to 12-bit | 8-bit |
| Compatibility | ~93% of browsers, ~1% of websites actually use it | Broader real-world adoption, longer track record |
| Encoder/tooling maturity | Newer, still maturing | Mature, widely integrated into CMS/CDN pipelines |
Keep AVIF When
- Serving images on your own website to modern browsers
- Maximum compression and HDR/wide-color support matter most
- You control both the encoder and the viewing environment
Convert to WebP When
- Publishing to a platform, CMS, or CDN that supports WebP but not AVIF
- You want broader real-world compatibility than AVIF currently has
- Your image-optimization pipeline is already built around WebP
Common Scenarios for AVIF to WebP Conversion
Publishing to a CMS or CDN Built Around WebP
Many content platforms, image-optimization services, and CDNs added WebP support years before AVIF and still don't accept AVIF uploads directly. Converting first lets you publish without waiting on the platform to catch up.
Targeting Broader Browser Support
While modern browsers handle AVIF well, WebP has a longer track record across older browser versions and embedded/in-app webviews. If you need the widest practical reach while still keeping most of the compression benefit over JPEG or PNG, WebP is the safer bet.
Keeping an Existing WebP-Based Workflow
If your site's build pipeline, responsive image tags, or asset optimizer already standardize on WebP, converting incoming AVIF assets to match keeps everything consistent instead of mixing two next-gen formats.
Preserving Transparency and Animation
Both formats support transparency and animation, so converting between them doesn't lose either — useful when a downstream tool only accepts WebP for animated or transparent assets.
Reducing Storage for Format-Agnostic Archives
If you're archiving assets and want a format with broader tooling support for future edits, converting to WebP keeps compression high while staying compatible with more editors than AVIF currently is. For compressing existing images further, Image Compressor can fine-tune the result afterward.
Other Ways to Convert AVIF to WebP
You can also convert AVIF to WebP using an image editor like GIMP or Photoshop, both of which support WebP export. FileCast is useful when you don't have an image editor installed.
Frequently Asked Questions
Is it safe to convert my images here?
Yes. This tool decodes and re-encodes your AVIF file entirely in your browser, using a WebAssembly build of the same libavif decoder browsers use natively. Your image is never uploaded to a server — when you close the tab, all data is gone.
Does converting to WebP reduce image quality?
Slightly. WebP is used here in lossy mode at a quality setting tuned for a good balance of size and visual fidelity, so there's a small amount of re-compression on top of whatever quality loss the AVIF encoding already introduced.
Is transparency preserved?
Yes. WebP supports an alpha channel, so any transparency in your original AVIF image carries over to the converted file.
Will the file size increase after conversion?
Often, yes, though usually less than converting to JPG or PNG would. AVIF is typically the more efficient of the two formats, so expect some increase, but WebP still compresses well compared to older formats.
Why does conversion take a moment for some files?
AVIF decoding is more computationally intensive than older formats. Larger or higher-resolution images take longer to process. Everything still happens on your device — there's no upload involved, just more work for your browser to do.