The decision was made the week following the attacks that left 130 people dead, the director of the Archives of Paris, Guillaume Nahon, said today.
City teams this month have been carefully gathering the pieces of paper damaged by rain. They have also removed faded flowers and consumed candles and have taken photos of the changing memorials.
Every day, new messages are left by passers-by, including lots of children drawings.
Hundreds of them are now drying out in the rooms of the Archives of Paris. They will be treated against mold and scanned in order to be available to scientists as well as the public on a future website.
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"To Justine, a young girl full of life (...) I will keep in memory these moments of joy and adventure I've spent with you in Santiago de Chile," one letter says, written on a schoolbook page.
Someone wrote: "We'll keep living, laughing, singing together, refusing the Barbary that kills innocent peoples." Archivist Mathilde Pintault said "it is important to keep track of the amount of tributes that have been left and the diversity of these tributes, some from children, from older people, from relatives of the victims, from anonymous people."
Archivist Audrey Ceselli told the AP she works with a "sense of urgency" but tries not to read the highly emotional notes in order to be able to do her job.
The operation is a first for the Archives of Paris. Most of the tributes left following the January attack against satirical newspaper Charlie Hebdo have been lost. The city is now trying to gather some photos taken at the time.
Raphaelle Fontaine, 22 year-old student from southwest of France visiting Paris for a few days, felt the need to come to the Bataclan concert hall, the site of the deadliest attack on November 13, to light a candle.