Free online SKETCH to WEBP converter

Source format overview

Sketch files are design documents created in Sketch, a popular vector-based UI and UX design application used mainly on macOS. A Sketch file usually has the .sketch extension and can contain artboards, symbols, text, shapes, images, and export settings. Designers use it for app interfaces, website mockups, icons, and design systems. Because it is a native design format, it is best suited for editing inside Sketch rather than for direct viewing on all platforms.

Target format overview

WebP is a modern image format developed by Google for the web. It supports lossy and lossless compression, transparency, and in many cases smaller file sizes than JPEG or PNG at similar visual quality. WebP is widely used for web graphics, screenshots, illustrations, and optimized image delivery. Its main advantages are efficient compression and broad support in modern browsers and image tools.

How to convert Sketch to WebP

The most reliable way to convert a Sketch file to WebP is to export the artwork from Sketch and then save it as WebP using a compatible editor or converter. If you only need a quick result, you can also convert the file on 101convert.com for free without installing any software.

1. Open the .sketch file in Sketch.
2. Select the artboard, layer, or page you want to convert.
3. Use File → Export or the export panel to export the design as a raster image such as PNG.
4. Open the exported image in a tool that supports WebP export, such as Photoshop, GIMP, Affinity Photo, or a command-line tool like ImageMagick.
5. Export or save the image as .webp.

If you are using ImageMagick, the conversion can be done from the command line after exporting from Sketch:

magick input.png output.webp

Some workflows may also allow direct batch conversion of exported PNG files to WebP, which is useful when a Sketch document contains multiple artboards or screens.

Quality, compatibility, and limitations

Sketch files are design documents, not final image files, so conversion to WebP usually means exporting the visible artwork rather than preserving editable design data. This is an important limitation: layers, symbols, text editing, and vector structure do not carry over into WebP. The result is a flattened image.

For best quality, export from Sketch at the desired resolution before converting, especially if the design contains text or fine vector details. If transparency is needed, make sure the export format preserves it before creating the WebP file. Lossy WebP can reduce file size significantly, but for UI mockups and screenshots, lossless WebP may preserve sharper edges and text better.

Compatibility is generally good in modern browsers and image viewers, but older software may not open WebP files. If the Sketch document contains multiple artboards, each one typically needs to be exported separately unless you use a batch workflow.