After a slow start to vaccinations, French health authorities reported that a million people had received coronavirus inoculations by Saturday.
But stubbornly high new rates for infections, hospitalisations and Covid deaths fuelled fears France may need another full lockdown, which would be the third, inflicting yet more devastation on businesses and daily lives.
Starting Sunday, arrivals to France from European Union countries by air or sea must be able to produce a negative PCR test result obtained in the previous 72 hours.
The requirement had already applied to non-EU arrivals since mid-January.
EU travellers entering France by land, including cross-border workers, will not need a negative test.
Some 62,000 people currently arrive in French airports and sea ports from other EU countries every week, according to Transport Minister Jean-Baptiste Djebbari.
Paris's main international airport Roissy-Charles-de-Gaulle has set up testing centres in a terminal dedicated to intra-EU flights to allow arriving passengers who failed to obtain a test in their country of origin to get one before passing immigration.
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