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Dhivyaa NaraayaniDhivyaa Naraayani 

Updation of existing leads

I want to upload the existing leads with modified values of certain fields using a .csv file without duplication. 

How can I do that ?

Dhivyaa - Download the lead records from your org into csv including the fields you want to modify/update and Id of the field. Then using DataLoader (,d.dGc)you can able the update the record based on the Id field which is unique field of the object.

I strongly recommend you to take a look into this trailhead module, which helps you to understand the export/import process in salesforce and then go for activity.

Dhivyaa NaraayaniDhivyaa Naraayani
Thanks a lot, Karanraj :)