| .I18 | Unknown Developer | Raster Image Files | Pixel Power Collage | XnView MP | XnSoft |
| .I3D | SideFX | Raster Image Files | Houdini Image 3D File | Side Effects Houdini | SideFX |
| .IC1 | Atari Corporation | Raster Image Files | Low Resolution Imagic Graphics File | Lemkesoft GraphicConverter | Lemkesoft |
| .IC2 | Atari Corporation | Raster Image Files | Medium Resolution Imagic Graphics File | Lemkesoft GraphicConverter | Lemkesoft |
| .IC3 | Atari Corporation | Raster Image Files | High Resolution Imagic Graphics File | Lemkesoft GraphicConverter | Lemkesoft |
| .ICB | Avid Technology | Raster Image Files | Targa ICB Bitmap Image | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ICN | Microsoft Corporation | Raster Image Files | Windows Icon File | Adobe Photoshop | Adobe Systems Incorporated |
| .ICON | The GIMP Development Team | Raster Image Files | Icon Image File | GIMP | The GIMP Development Team |
| .ICPR | Aha-Soft | Raster Image Files | IconUtils Project File | Aha-Soft IconUtils | Aha-Soft |
| .ICS | IronCAD, LLC | Raster Image Files | IronCAD 3D CAD Drawing File | IronCAD | IronCAD, LLC |
| .IEF | Unknown Developer | Raster Image Files | Bitmap Image Exchange File | Unknown Software | Unknown Developer |
| .IF9 | Unknown Developer | Raster Image Files | Pixel Power Collage | XnView MP | XnSoft |
| .IFL | Autodesk, Inc. | Raster Image Files | 3ds Max Image File List | Autodesk 3ds Max | Autodesk, Inc. |
| .ILBM | Electronic Arts | Raster Image Files | Interleaved Bitmap Image | IrfanView | Open Source |
| .ILD | Open Source | Raster Image Files | XWE Data | XWE | Open Source |
| .IM1 | Sun Microsystems | Raster Image Files | Sun Raster Image File | GIMP | The GIMP Development Team |
| .IM5 | Thermo Fisher Scientific Inc. | Raster Image Files | Visilog Image File | Visilog | Thermo Fisher Scientific Inc. |
| .IM8 | Sun Microsystems | Raster Image Files | Sun Raster Graphic File | GIMP | The GIMP Development Team |
| .IMG | Unknown Developer | Raster Image Files | Disk Image Data File | IsoBuster | Smart Projects |
| .IMJ | AccuSoft Corporation | Raster Image Files | JFIF Bitmap Image | ImagXpress | AccuSoft Corporation |
| .IMQ | NASA | Raster Image Files | NASA Planetary Image File | PDS Tools Package | NASA |
| .INB | LucasArts Entertainment Company, LLC | Raster Image Files | Rebel Assault Backup | Star Wars: Rebel Assault | LucasArts Entertainment Company, LLC |
| .INFO | GNU Project | Raster Image Files | Texinfo Document | GNU Emacs | GNU Project |
| .INK | Mimio | Raster Image Files | Mimio Ink Data File | MimioStudio | Mimio |
| .IPC | IncrediTools | Raster Image Files | IncrediFlash Tools Image File | IncrediFlash | IncrediTools |
| .IPX | Minds-Eye-View | Raster Image Files | IPIX Image | Minds-Eye-View IPIX Interactive Studio | Minds-Eye-View |
| .IRIS | Silicon Graphics, Inc. | Raster Image Files | Silicon Graphics Iris Image | XnView MP | XnSoft |
| .ITC2 | Apple | Raster Image Files | iTunes Cover Flow Data File 2 | Apple iTunes | Apple |
| .ITG | Intergraph Corporation | Raster Image Files | Intergraph Format Bitmap Graphics | XnView MP | XnSoft |
| .ITHMB | Apple | Raster Image Files | iPod And iPhone Photo Thumbnails File | Dec Software iThmb Converter | Dec Software |
| .IVR | RealNetworks | Raster Image Files | Internet Video Recording | RealNetworks RealTimes | RealNetworks |
| .IVUE | HSC Software (Harvard Systems Corporation) | Raster Image Files | Live Picture IVUE Image | Live Picture | HSC Software (Harvard Systems Corporation) |
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