Free online CGM to WEBP converter

CGM drawings from CAD, engineering, or technical-documentation systems may need conversion when a website or image viewer accepts WEBP but not CGM. Converting also creates a raster image that is easier to share, although it is no longer editable as vector artwork.

What the CGM format is

CGM (Computer Graphics Metafile) is a graphics format defined for storing vector elements, raster images, and related drawing information. It is used for technical illustrations, engineering diagrams, and other graphics that need precise lines and shapes. CAD, engineering, and technical publishing programs can create or export CGM files; you may also encounter them in legacy documentation.

What the WEBP format is

WEBP is a raster image format used on websites and in applications that support modern web images. It supports lossy and lossless compression, transparency, and animation. Choose it when you need a compact image for web display or sharing, rather than an editable technical drawing.

How to convert CGM to WEBP

Online on 101convert.com

Upload the CGM file on the 101convert.com converter page, choose WEBP, set any needed options, then convert and download the result. Several files can be processed as a batch; the per-file size limit is shown on the page. Before converting, you can set pages, resolution, quality, image size, max width, max height, auto orient, and strip metadata. The conversion runs on the server with LibreOffice, then ImageMagick.

Offline with desktop software

With LibreOffice Draw and ImageMagick, first open the CGM in Draw and export it as a PDF using File → Export As → Export as PDF. Then rasterize the first PDF page as WEBP:

magick -density 300 "input.pdf[0]" -quality 85 output.webp

LibreOffice and ImageMagick are available for Windows, macOS, and Linux. ImageMagick needs PDF-reading support, commonly provided by Ghostscript, and a build with WEBP support. Adjust -density 300 to change raster resolution and -quality 85 to trade file size against lossy image quality.

Quality and compatibility

CGM is often vector-based, so conversion rasterizes its lines and text; increase the resolution if fine details look jagged, and check the result at its intended display size. CGM variants and application-specific fonts or drawing features can render differently, so review labels, line weights, and fills after conversion. The resulting WEBP does not retain CGM layers or vector editability.