The FTP protocol defines two ways of transferring files: ASCII (Text) and Binary.
A binary transfer creates a byte-for-byte identical copy of the transferred file.An ASCII transfer is intended for files which contain only plain text, and will attempt to convert the line endings from those of the sending system to those of the receiving system.By default, Transmit runs in Automatic mode, which means that Transmit will make a decision about whether to use ASCII or binary for each file based on its file type extension. For example, an "html" file would be sent in ASCII mode and a "png" file would be sent in binary mode.Leave Transmit in automatic mode unless you know of a specific reason that a different mode should be used.To change transfer modes:Choose Tranfer > Mode
Choose ASCII (Text), Binary, or Auto
That transfer mode will be used for all subsequent transfers.
In automatic mode, Transmit assumes all files should be sent in binary mode unless they are specifically listed as known ASCII file types.To add or remove a file type from the list of known ASCII file types:Choose Transmit > Preferences...
Click Transfers
Click + or - in the ASCII File Extensions section to add or remove ASCII types