US President Joe Biden has issued presidential pardons to 39 Americans convicted of non-violent crimes, and commuted the sentences of nearly 1,500 other people.

The White House described it as the most acts of presidential clemency issued in a single day. It has not given the names of the people involved.

The US Constitution decrees that a president has the broad "power to grant reprieves and pardons for offences against the United States, except in cases of impeachment".

Earlier this month, Biden issued a controversial pardon to his son Hunter, which continued a recent trend of presidents pardoning people close to them.

Announcing the move, Biden said those pardoned had "shown successful rehabilitation and have shown commitment to making their communities stronger and safer". Their non-violent convictions included drug offences.

The commuted sentences were for hundreds of people who were placed in home confinement during the Covid-19 pandemic, and who were facing sentences which Biden deemed to be too long under outdated laws.

They have "shown that they deserve a second chance", Biden said.

Giving further details of the move, the White House said those receiving relief included a decorated military veteran and pilot who helped fellow church members, a nurse who helped with the Covid vaccine rollout, and an addiction counsellor.

Biden promised "more steps in the weeks ahead".

The president will leave the White House on 20 January 2025, when his successor Donald Trump is inaugurated.

Biden previously had a record of pardoning fewer people than most presidents in modern US history.

He had issued a few categorical pardons in the past, however. These are pardons given to a sweeping number of people who fall under a category outlined by the president.

In October 2022, Biden issued a full pardon for those who had been convicted of simple possession of marijuana, and later expanded that to include other marijuana-related offenses.

Earlier this year, Biden issued another full pardon to military personnel and veterans who were convicted of an offence based on their sexual orientation.

Trump granted 237 acts of clemency during his first term in the White House, according to the Pew Research Center. These included 143 pardons and 94 commuted sentences.

Many were in a flurry before he left office.

Biden's decision earlier this month to pardon his son, Hunter, continued a trend of presidents on both sides of the US political divide - including Trump - granting clemency to people close to them.

Biden Jr was facing sentencing for two criminal cases.

The move has proven controversial, since the outgoing president previously ruled out doing it. But he claimed the cases against his son were politically motivated.

Biden has also weighed issuing pre-emptive pardons for prominent critics of his successor Trump in a bid to shield them from retribution after the president-elect takes office, but has reportedly been concerned about the precedent it would set.