AVIF and WebP are different image formats, not guaranteed file-size wins

AVIF and WebP are modern raster image formats that can encode images using lossy or lossless approaches, depending on the format and encoder. Their output size and appearance depend on the source image, settings, encoder implementation, and intended display. Neither format will always produce the smallest file or the best-looking result for every image.

Google documents WebP's lossy, lossless, and transparency capabilities in its WebP documentation. The web.dev AVIF guide describes AVIF's web-image capabilities and notes that format support should be considered for the intended audience and delivery path.

Compare files at the quality you need

Use the same source and create candidate outputs with recorded encoder settings. Compare file size and visible details at the dimensions where the image will be used. Look closely at gradients, texture, text, and transparency edges. A useful comparison records the sample images and settings; without that method, a percentage-saving claim should not be generalized.

Consider compatibility and workflow support

Check whether the browsers, content-management system, marketplace, editing tools, and processing pipeline that matter to you accept the format. A smaller file is not useful if the destination cannot use it or if the workflow cannot decode and validate it reliably.

AVIF and WebP input or output availability varies across applications and image-processing runtimes. Preparya's format options are determined by its current server runtime. Check the formats offered in the format-conversion workspace before starting a batch; this guide does not promise that AVIF conversion is available on every deployment.

Choose per image and destination

Keep the source image and compare the final alternatives in context. Retain a compatible fallback when a destination requires one, preserve transparency only when needed, and avoid repeated lossy exports. There is no universal setting that balances size and quality for every photograph, graphic, or product image.

For transparent cutouts, see our PNG and WebP transparency guide. For dimensions, see Preparya's batch image resizer.