What is a WebP file?
WebP was created by Google to replace both JPG and PNG on the web. It supports lossy and lossless compression, transparency, and even animation in a single format. In lossy mode WebP files are typically 25–35% smaller than a JPG of comparable visual quality, which directly improves page-load speed and Core Web Vitals.
In short, WebP is Google's modern web format — smaller than JPG and PNG. It is best for website images of every kind — product photos, hero images, thumbnails — where smaller files mean faster pages. Its main limitations are not accepted by some older software, printing services, and government/upload forms that still expect JPG or PNG.
Why convert WebP to AVIF?
AVIF is built on the AV1 video codec and delivers the strongest compression of any mainstream image format — files are often about half the size of an equivalent JPG and noticeably smaller than WebP at the same visual quality. It supports transparency, HDR, and wide color gamuts.
Converting from WebP to AVIF makes sense when you need performance-critical websites where every kilobyte counts, and modern image pipelines that can serve fallbacks. AVIF is supported by all current versions of Chrome, Firefox, Safari, and Edge.
Both formats support transparency, and this converter preserves the alpha channel — transparent areas in your WebP stay transparent in the AVIF.
How to convert WebP to AVIF
Drag and drop one or more WebP files into the box above (or click to browse). Adjust the quality slider if you want smaller files or higher fidelity, then press Convert. Each file is decoded and re-encoded as AVIF on your own device in a second or two, and you can download results individually or grab everything as a ZIP.
Unlike most online converters, FileLark never uploads your files to a server. The conversion runs entirely inside your browser using modern web technology, which means it works offline once the page has loaded, there are no file size queues or daily upload limits, and your images can never be stored, scanned, or leaked — they simply never leave your device.