WebP to AVIF Converter
Convert a WebP image to the even more efficient AVIF format directly in your browser.
This tool runs entirely in your browser. Your files are never uploaded to a server.
Drop a WebP here or click to upload
What this tool does
Encodes a WebP image as AVIF, a next-generation format based on the AV1 video codec, using a WebAssembly build of the libavif encoder that runs entirely inside your browser.
How to use it
Drop or select one WebP file. The image is drawn to a canvas and its pixels are handed to the WebAssembly AVIF encoder; a ready-to-download AVIF file appears once encoding finishes, typically within a few seconds.
Worked example
Upload product-shot.webp (310 KB) and you get product-shot.avif ready to download, encoded at the tool's default quality setting of 75.
Why convert to AVIF
AVIF generally compresses somewhat better than WebP at equivalent visual quality, so converting can shave off extra file size — though the gain over WebP is usually smaller than converting from JPG or PNG, since WebP is already an efficient format.
What changes technically
Encoding runs a full WebAssembly build of the AV1 image encoder in your browser, which is more computationally demanding than a simple format conversion — large images can take several seconds instead of appearing instantly. Any alpha (transparency) channel in the source WebP is preserved in the AVIF output.
Limitations
Only one file can be converted at a time — there's no batch mode or quality slider yet. Some older devices, email clients and desktop software still don't display AVIF, so keep a WebP or JPG copy if you're unsure the recipient supports it.
Scope, sources and privacy
Encoding uses a WebAssembly build of the open-source libavif library (the reference AVIF codec). The whole process runs locally in your browser; your image is never uploaded to a server.
Frequently Asked Questions
- Is my image uploaded to a server?
- No — the AVIF file is encoded entirely in your browser using WebAssembly. Your original image never leaves your device.
- Is it worth converting WebP to AVIF?
- If your site or app already supports AVIF, it can shave off extra file size compared to WebP at similar quality — but if broad compatibility matters more than a few extra percent of savings, WebP alone is often good enough.
- Does the AVIF keep my WebP's transparency?
- Yes — AVIF supports an alpha channel, so transparent areas in the source WebP are preserved in the output.