| god | Atari Falcon GodPaint Image |
| goe | GOES Satellite Bitmap Image |
| gp4 | CALS Compressed Bitmap |
| gr9 | Atari 8-bit Graphics 9 Image |
| grb | HP-48 Graphic Object |
| grd | Adobe Photoshop Gradient File |
| grl | MATLAB Image |
| gro | HP-48 Graphic Object |
| gro2 | HP-49 Graphic Object |
| gro4 | HP-49 Graphic Object |
| grob | HP-48 Graphic Object |
| gry | Grayscale Image |
| gtx | Genetica Texture |
| gun | C64 GunPaint Image |
| gx1 | Show Partner Graphics Data |
| gx2 | Show Partner Graphics Data |
| hald | Hald CLUT Image |
| ham6 | Commodore Amiga Hold-And-Modify 6 Bitmap |
| ham8 | Commodore Amiga Hold-And-Modify 8 Bitmap |
| hbm | C64 Hires Bitmap Image |
| hc | High Resolution Continuous-tone TIFF Image |
| hcg | Catia Highly Compressed Graphics |
| hdp | Microsoft HD Photo |
| hdr | HDRi Image |
| hdr | Apollo HDRU Image |
| hdri | HDRi Image |
| hdru | Apollo HDRU Image |
| hed | Hi-Eddi Image |
| heic | HEIF Image |
| heif | HEIF Image |
| hfc | Commodore 64 Hires FLI Image |
| hg1 | HP Graphic Language Document |
| hg2 | HP Graphic Language Document |
| hgb | Amstrad CPC HinterGrundBild Bitmap |
| hgl | HP Graphic Language Document |