| iwc | Wavelet Bitmap Image |
| iwi | Call of Duty Skin Data |
| izx | ZX Spectrum Icon |
| j | JPEG Bitmap Image |
| j2c | JPEG 2000 Code-stream Data |
| j2k | JPEG 2000 Code-stream Data |
| j2p | JPIP Indexed File |
| j6i | Ricoh Digital Camera Image |
| jb2 | JBIG2 Bitmap Image |
| jbg | JBIG Bitmap Image |
| jbig | JBIG2 Bitmap Image |
| jbig | JBIG Bitmap Image |
| jbig2 | JBIG2 Bitmap Image |
| jbr | Corel Paint Shop Pro Brush |
| jdr | JpgfDraw Drawing Binary |
| jff | JPEG Bitmap Image |
| jfi | JPEG Bitmap Image |
| jfif | JPEG Bitmap Image |
| jfx | J2 jConnect Fax File |
| jif | JPEG Bitmap Image |
| jig | Puzzle Image |
| jip | JIP Analysis Toolkit Image |
| jj | C64 Doodle Compressed Image |
| jls | Lossless JPEG Image |
| jmg | Laservision Graphic |
| jng | Jpeg Network Graphics |
| jp2 | JPEG 2000 Bitmap Image |
| jp4 | Elphel Project JP4 File |
| jpc | JPEG 2000 Code-stream Data |
| jpe | JPEG Bitmap Image |
| jpeg | JPEG Bitmap Image |
| jpeg2000 | JPEG 2000 Bitmap Image |
| jpf | JPEG 2000 Bitmap Image |
| jpg | JPEG Bitmap Image |
| jpg-large | Google Chrome Saved Twitter Picture |
