This is a question that comes up once in a while. Let us take the time to provide a thorough analysis. In Islam, Halal means ‘lawful’ or ‘permitted’ and refers to all matters of life, not just food. In the same way, haram means ‘unlawful’ or ‘prohibited’ and refers to all matters of life, not just food. So it is proper to refer to pure foods, marriage to a cousin, having marital relations during the nights of Ramadan, etc. as being Halal. In the same light, it is proper to refer to pork, marriage to your sister or brother, hunting while in the Sacred Precincts or in Pilgrim garb (for Haj or Umrah), shameful deeds, etc. as being haram.
When it comes to meat and poultry, Muslims also use the term Zabiha (Dhabiha) to refer to meat from a Halal animal slaughtered by a Muslim in the prescribed Islamic way. (Meat from haram animals does not become Halal, even if it is slaughtered in the prescribed Islamic way. And a Muslim would never slaughter a haram animal.)
Kosher is a term
Islam prohibits all intoxicants, including alcohols, liquors and wines, whereas Judaism regards alcohol and wines as Kosher. Hence Kosher foods may contain alcohol. If they do, they are haram.
Gelatin is considered Kosher by many Jews regardless of its source of origin. For Muslims, if gelatin is prepared from swine it is haram. Even if gelatin is prepared from cows that are not Zabiha, many scholars consider it haram.
Kosher practice does not require Jews to pronounce the name of God on the animals while slaughtering, but Muslims must pronounce the name of ALLAH on all animals while slaughtering.
There may be other differences between Halal and Kosher that make the Kosher questionable for Muslims to consume.
These differences may seem minor to some. However, indulging in haram is a very serious offense against ALLAH and the punishment may be severe. Consuming alcohol or pork is a clear violation of ALLAH’s commandments and should not be taken lightly. The pronouncement of the name of ALLAH at the time of slaughter is also a major act of worship and obedience. Remembering and pronouncing the name of ALLAH is very dear to Muslims and it is required at the time of slaughter.
And ALLAH, Subhanahu wa ta’ala, knows best.