SFTP vs SCP: Which File Transfer Method Should You Use?

When it comes to transferring files securely between your local machine and a remote server, SFTP and SCP are the two most common options. Both run over SSH and encrypt your data in transit, but they differ significantly in features, performance, and use cases. In this article, we break down the differences to help you choose the right tool for the job.

SCP: Simple and Fast

SCP (Secure Copy Protocol) is the simpler of the two. It copies files between hosts using SSH for encryption and authentication. The syntax is straightforward: scp file.txt user@remote:/path/. SCP excels at one-off file transfers where speed matters. It uses a more efficient transfer algorithm that can be faster than SFTP for large files on high-latency networks. However, SCP has significant limitations: it cannot resume interrupted transfers, list remote directories, or delete files on the remote server.

SFTP: Feature-Rich and Interactive

SFTP (SSH File Transfer Protocol) is a full-featured file transfer protocol built on top of SSH. Unlike SCP, SFTP provides an interactive session where you can browse remote directories, rename files, set permissions, and resume interrupted transfers. The command sftp user@remote drops you into an interactive shell with commands like ls, cd, put, and get. SFTP is the better choice for ongoing file management tasks and is the protocol used by most graphical SFTP clients and tools like SSH Bridge's built-in file manager.

Performance Comparison

In controlled benchmarks, SCP can be 10-20% faster than SFTP for large file transfers due to its simpler protocol overhead. However, SFTP supports parallel transfers and pipelining, which can close or eliminate this gap in practice. For transferring many small files, SFTP's ability to batch operations makes it more efficient overall. The performance difference is rarely significant enough to be the deciding factor for most use cases.

Which Should You Use?

Use SCP when you need a quick, one-line command to copy a file and do not need any interactive features. Use SFTP when you need to browse remote file systems, manage files interactively, resume interrupted transfers, or integrate with a graphical client. For most modern workflows, SFTP is the recommended choice due to its versatility and feature set. Note that OpenSSH has deprecated SCP's underlying protocol in favor of SFTP, so the industry is clearly moving toward SFTP as the standard. SSH Bridge supports both protocols, giving you the flexibility to choose the right tool for each situation.