The invention discloses a method, a client-side equipment, a server and a system for uploading files and belongs to the field of the network technology. The method comprises the steps of receiving file uploading instructions, sending storage information request information to the server, wherein the storage information request information carries the file eigenvalue of the file, using a file offset address as an uploaded initial file offset address to upload the part, behind the file offset address, of the file when receiving storage information, containing the file offset address, returned by the server according to the file eigenvalue of the file. The method, the client-side equipment, the server and the system for uploading the files can upload files, and can upload the files without logging in the account and verifying compared with the uploading process of the prior art. The uploading on the base enables the client-side equipment to obtain stored storage information of the file on the server. Only an unsaved part on the server needs uploading. Uploading does not need conducting from the self file, so that unnecessary flow loss of users is avoided.