The Vermont senator, who lost to Mrs Clinton in the race to be the party's presidential candidate, will call for Democrats to unite behind her in a speech to the Philadelphia convention.
He will say she is a "far superior" candidate to Republican Donald Trump.
But some Sanders supporters protested, vowing never to vote for her.
The four-day convention got under way at 1600 EDT (2000 GMT) with music from Mother Bethel AME Church choir and Boyz II Men.
A few hours earlier, Mr Sanders had implored his supporters to defeat Donald Trump by getting behind Mrs Clinton and her running mate Tim Kaine.
Email scandal
The convention gets under way on Monday with a leaked email scandal threatening to overshadow it.
Wikileaks released emails that show the Democratic National Committee (DNC), which runs the party, was biased against Mr Sanders when he ran against Mrs Clinton in the hard-fought primary contest.
The FBI has confirmed that it is investigating the leak.
Chairwoman Debbie Wasserman Schultz resigned on Sunday as pressure built on the party to address the scandal. The outgoing chair said on Monday she would no longer be speaking at the opening of the convention.
Mrs Clinton's campaign team has said the hackers who accessed the DNC emails were Russians who want Mr Trump to win the election.
One of the emails from a Democratic party official suggested raising Mr Sanders' faith as a means to discredit him. Other emails openly disparaged him and expressed a preference for his rival.
Sanders supporters have long claimed that the party's governing body, which was meant to remain neutral, had favoured the former secretary of state.
Mr Sanders himself said he was not surprised by the emails but he wanted to focus on helping the party beat Donald Trump.
A statement from his campaign said his speech on Monday would "make it clear that Hillary Clinton is by far superior to Donald Trump on every major issue from economics and health care to education and the environment".
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