Download Odin Tool (All Versions)
Odin_v1.85.zip (recommended for Gingerbread/Ice Cream Sandwich firmwares)
Odin_v3.09.zip (recommended for JellyBean/KitKat firmwares)
Odin3_v3.10.7.zip (recommended for Lollipop firmwares)
Odin3 v3.11.1.zip (latest version recommended for flashing Marshmallow firmware)
Odin3 v3.11.2.zip (New UI)
Note: If you have been following some tutorial to flash the stock firmware or firmware component/s, please use the Odin version recommended in the guide.