How to Convert AVIF to WebP

Before you start

This task changes the file format, not the visible image. AVIF and WebP are both compressed image formats. A converter decodes the AVIF source and writes a new WebP file, so the original AVIF remains unless you explicitly replace or delete it. Keep the source file available in case you want to try different quality settings later.

Check whether your tool runs locally or in a browser-based service. A local converter is preferable for private photos or recordings because the file does not leave the device. Online services are convenient, but upload handling depends on the provider and should be checked before you send personal or sensitive images.

Before converting, note the source file's pixel dimensions and aspect ratio. These values can be checked in most image viewers under properties or image information. You will compare them with the WebP result to confirm that no unintended crop or resize occurred.

Step-by-step instructions

The exact menu names vary by converter, but the basic sequence is the same for desktop tools and browser-based services.

• Open the converter and add the AVIF file. In a desktop tool this is usually an Open or Add Files button. In a web converter it is usually an upload area.
• Select WebP as the output file format.
• Set the quality or compression level if the tool shows this option. Lower quality produces a smaller file and may introduce visible artifacts. Higher quality keeps more detail but increases file size.
• Keep the pixel dimensions unchanged unless you have a specific reason to resize. The default should preserve the source width and height.
• Choose lossy or lossless encoding when the converter offers the choice. Lossless preserves every pixel and usually creates a larger WebP file. Lossy WebP can be much smaller, but the level of visual change depends on the quality setting.
• Enable transparency if the source AVIF has transparent areas and the converter does not preserve it automatically.
• Run the conversion and save the WebP file to a known folder.

If you are using a graphics editor, look for an export or save for web command. WebP may appear under modern image formats or web formats. Some editors call the lossy control quality and the lossless control compression, while others include both options in one export dialog.

Check the output

Open the converted WebP file in an image viewer or browser. Compare its width and height with the source AVIF. The pixel dimensions and aspect ratio should match unless you changed the size intentionally.

Zoom in to the same area of both files to check fine detail, edges and color transitions. Expect some visible difference with lossy compression, especially at lower quality settings. If the image includes transparency, place it on a plain background or checkerboard preview to confirm that transparent areas are still transparent.

File size alone is not a quality check. A much smaller WebP may be heavily compressed, while a larger lossless file may simply contain more image data. Use size together with the visual comparison when deciding whether to adjust the quality setting.

Common problems and next steps

If a converter does not open the AVIF file, the application or browser may not support the source format or the file may have an incorrect extension. Update the tool if possible, or try another AVIF to WebP converter. A file that opens in a browser but not in an older desktop program is often a compatibility issue rather than a damaged image.

If the WebP image looks noticeably worse than the AVIF, repeat the conversion with a higher quality setting or lossless mode. If the output is larger than expected, reduce quality in small steps and compare the result. When transparency is missing, check the export settings and re-export with transparency or alpha channel enabled.

Keep the original AVIF until you have verified the WebP file in its intended use, such as a website, document or chat app. The converted file should replace the source only after the dimensions, transparency and visual quality are acceptable.