Watermelon+ was launched at the Cannes film festival as more than 100 people were killed in Israeli strikes on Gaza on Thursday. At least 80 died on Wednesday.
"Unless we get (Palestinian) voices out there, nothing's going to change," said Badie Ali, one of two US-born Palestinian brothers who founded the website, where Hadid is creative director.
A model and activist, her father, property developer Mohamed Anwar Hadid, is Palestinian.
Showing "neglected or silenced" Palestinian perspectives was particularly important in the United States, an ally of Israel, Ali insisted.
The platform offers around 60 films, including several set in Gaza.
They span from Emmy-awarded documentary "Five Broken Cameras" to "The Wanted 18", a comic true story about West Bank villagers hiding cows inside their houses from Israeli troops during the First Intifada.
Co-founder Hamza Ali said the aim was to humanise Palestinians.
"It's dehumanisation and erasure that contribute to the politics," he said.
"We're more than our suffering. We're a warm, hospitable, creative, funny people."
The Israeli genocidal war on Gaza has killed more than 53,000 people and wounded 120,000, mostly women and children, and an aid blockade has left more than two million on the verge of starvation.
*This story was edited by Ahram Online.
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