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| JAR | Java ARchive (a compressed file for applets and related files) |
| JAS | Graphic (Generic) |
| JAVA | Source code (Java) |
| JBD | Datafile (SigmaScan) |
| JBF | Image browser file (Paint Shop Pro) |
| JBX | Project file (Project Scheduler 4.0) |
| JFF | JPEG image |
| JIF | JPEG image |
| JFIF | JPEG image |
| JMP | Discovery chart-to-statistics (SAS JMP) |
| JMS | Graphical representation of a Interactive Voice Response call flow (Voxtron TeleButler) |
| JN1 | Jill of the Jungle data (Epic MegaGames) |
| JNB | Workbook file (Sigma Plot 5) |
| JOB | Vector graphics file created by conversion of a IMG file (QuestVision) |
| JOR | Journal (Microsoft SQL Server) |
| JOU | Journal backup (VAX Edt editor) |
| JPC | Graphic (Japan PIC) |
| JPE | JPEG image |
| JPEG | JPEG compressed bitmap |
| JPG | JPEG bitmap |
| JS | JavaScript source code |
| JSD | Jet Suite document (eFAX) |
| JSP | A HTML page containing a reference to a Java servlet |
| JTF | JPEG bitmap |
| JTF | Fax document (Hayes JT Fax) |
| JTF | Bitmap graphic (JPEG Tagged Interchange Format) |
| JTK | Java ToolKit file (Sun Microsystems) |
| JW | Text document (JustWrite) |
| JWL | Library (JustWrite) |
| JZZ | Spreadsheet (Jazz) |
| J62 | Ricoh camera file |