CGM is a Computer Graphics Metafile - a vector graphics format standardised in the 1980s and still used for technical illustration in aviation and engineering. CGM is so entrenched in aerospace documentation that it remains a required illustration format in standards like S1000D decades after its debut. Analyser handles .CGM alongside related formats such as .TGA, .QOI, .PPM and more. In Analyser's format library, .CGM sits in the Images category.

How do I open a .CGM file?

Drop a .CGM file onto Analyser at https://lab.valjdakosta.com/ and it is identified directly in your browser - no upload, no account and no software to install. Decode and preview extra still-image formats in pure JavaScript - Truevision TGA, QOI, Netpbm (PPM/PGM/PBM), PCX, farbfeld, WBMP, XBM/XPM, Sun Raster and SGI are fully rendered - and read header metadata from codec-heavy formats: Radiance HDR, DirectDraw Surface (DDS) game textures, OpenEXR, JPEG 2000, JPEG XR, EPS/PostScript, Windows WMF/EMF metafiles, Apple ICNS icons, CUR/ANI cursors, MNG and Lottie animations.

Can I open a .CGM file online for free?

Yes. Analyser is a free online .CGM identifier that runs entirely in your browser - your .CGM file never leaves your device, so there is nothing to upload and no software to install. It even works offline once installed.

.CGM file - what it is and how to identify it online

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Home › Formats › .CGMID

What is a .CGM file?

CGM is a Computer Graphics Metafile - a vector graphics format standardised in the 1980s and still used for technical illustration in aviation and engineering.

Did you know: CGM is so entrenched in aerospace documentation that it remains a required illustration format in standards like S1000D decades after its debut.
Analyser handles .CGM alongside related formats such as .TGA, .QOI, .PPM and more.
In Analyser's format library, .CGM sits in the Images category.
What Analyser reads: Decode and preview extra still-image formats in pure JavaScript - Truevision TGA, QOI, Netpbm (PPM/PGM/PBM), PCX, farbfeld, WBMP, XBM/XPM, Sun Raster and SGI are fully rendered - and read header metadata from codec-heavy formats: Radiance HDR, DirectDraw Surface (DDS) game textures, OpenEXR, JPEG 2000, JPEG XR, EPS/PostScript, Windows WMF/EMF metafiles, Apple ICNS icons, CUR/ANI cursors, MNG and Lottie animations.
Depth of analysis: .CGM is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
Open a .CGM file: Drag a .CGM file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
Related formats: .TGA · .QOI · .PPM · .PGM · .PBM · .PNM · .PAM · .PCX · .FF · .FARBFELD · .WBMP · .XBM · .XPM · .RAS · .SGI · .BW · .HDR · .DDS and more. See all supported file types.