French president Nicolas Sarkozy's office has called for all charges against her and a French-Iranian embassy employee to be dropped.
Ms Reiss had been originally arrested in Tehran on 1 July, following her involvement in post-election street protest campaigns.
President Sarkozy has thanked the European Union and the country’s allies, for their help in getting Ms Reiss freed from her imprisonment in Iran.
French Foreign Minister Bernard Kouchner has announced on television that a verdict for Ms Reiss’s case is expected in about eight days.
