In the Constitution which branch of the government can grant pardons?
According to current laws (and this should be in the Constitution as well), the Executive Branch, specifically the President of the United States, is allowed the 'power of pardon' (the ability to grant pardons).
The executive branch. Remember that the executive branch has the president, and the president is the one who pardons people
What articles and section gives the president the power to grant reprieves and pardons for offenses against the US?
A president's power to grant pardons is formally called the Presidential Power to Grant Reprieves and Pardons. This power allows the president to forgive criminal actions and grant permission to cancel the punishments stipulated by the judicial system. This power can be used in all types of criminal actions except for impeachment.
In the United States, it is the executive branch of government that can pardon a convicted criminal. By issuing a pardon, the executive is overruling the decision of the judicial branch (the court system). Federal crimes can be pardoned by the President. Crimes tried and sentenced in state courts can be pardoned by the governor of that state. The only time a federal or state executive cannot grant a pardon is in cases of impeachment.