Today's ceremonies come as Charlie Hebdo is releasing a special anniversary issue laced with obscene and offensive cartoons, its surviving artists and columnists vaunting their freedom to lampoon everyone from Muslim fundamentalists to children, politicians and Catholic priests.
Victims' families joined Hollande and other dignitaries near the building where Charlie Hebdo staff were holding an editorial meeting when two heavily armed brothers stormed in on January 7, 2015, killing 11 people.
They then paid homage to a police officer killed as he tried to chase down the fleeing gunmen. Spray painted on the sidewalk was a message of support for the Muslim officer, reading "Je suis Ahmed," or "I am Ahmed," in the red, white and blue of the French flag.
After the attacks, people around the world embraced the expression "Je suis Charlie" to express solidarity with the slain journalists, targeted for the paper's caricatures of the Prophet Muhammad.
Hollande then paid homage to four people killed at a kosher supermarket in an attack that revived concerns about anti-Semitism in the country with Europe's largest Jewish community.
The Charlie Hebdo memorial plaque was hastily covered up after authorities discovered a spelling error in the name of slain cartoonist Georges Wolinski. The black covering was later removed, and a new plaque is being prepared after the embarrassing incident.
Hollande will unveil another plaque on Saturday to honor police officer Clarissa Jean-Philippe, who was killed in the southern Paris suburb of Montrouge by one of the attackers on January 8.
The country remains under a state of emergency after the November 13 attacks in Paris that killed 130 people, and extra security was on hand for today's commemorations.
