What is the difference between FTP and SFTP

What is the difference between FTP and SFTP?


In today’s digital age, the efficient and secure transfer of files is essential for businesses and individuals alike. Two commonly used protocols for file transfer are FTP (File Transfer Protocol) and SFTP (Secure File Transfer Protocol). While both serve the purpose of transferring files, they have distinct differences in terms of security, functionality, and use cases. In this article, we will explore the critical differences between FTP and SFTP to help you decide which protocol best suits your specific needs.


One of the most significant differences between FTP and SFTP is security. FTP operates in clear text, meaning that data transmitted via FTP is not encrypted, making it vulnerable to interception. This lack of security can pose a significant risk, especially when transferring sensitive or confidential information.

On the other hand, SFTP, as the name suggests, is designed for secure file transfers. It employs encryption protocols such as SSH (Secure Shell) to ensure data is encrypted during transmission. This encryption significantly reduces the risk of data breaches and unauthorized access, making SFTP the preferred choice for secure file transfers.


Authentication is another critical aspect where FTP and SFTP differ. In FTP, user authentication typically relies on usernames and passwords. While standard, this method can be susceptible to brute force attacks and password theft if not correctly configured.

SFTP, on the other hand, offers more robust authentication mechanisms. It often utilizes SSH critical pairs for authentication, which are far more secure than traditional username and password combinations. SSH keys are challenging to crack, providing an added layer of protection to your file transfers.


FTP is widely supported by various operating systems and software applications, making it a versatile choice for file transfer. Its simplicity and widespread use make it an attractive option for many users. However, as mentioned earlier, this ease of use comes at the cost of security.

SFTP, while less universally supported than FTP, is still compatible with a wide range of platforms and clients. The added security features of SFTP may require users to configure their systems properly to ensure compatibility, but the benefits in terms of security outweigh the minor inconvenience.

Firewall Friendliness:

FTP can be challenging to work with in environments protected by firewalls. FTP requires multiple ports for data transfer, often causing firewall-related issues. Passive FTP mode can help mitigate some of these problems, but it requires additional configuration and can be less reliable.

SFTP, on the other hand, typically uses a single port (usually port 22) for both commands and data transfer. It simplifies firewall configurations and makes SFTP more firewall-friendly, ensuring a smoother file transfer process.

Integrity Checks:

Integrity checks are essential to ensure that the transferred files are not corrupted during the transfer process. FTP lacks built-in integrity checks, so you may need to implement additional measures, such as checksums, to verify file integrity.

SFTP, by contrast, automatically performs integrity checks as part of its secure transfer process. It ensures that files remain intact and unaltered during transit, providing peace of mind to users concerned about data integrity.


File TransferFTP and SFTP allow for the transfer of files between a client and a server.Both FTP and SFTP serve the same primary function of transferring files.
Directory ListingBoth protocols provide directory listing capabilities, allowing users to view the contents of remote directories.Directory listing is a common feature in both FTP and SFTP, aiding navigation.
User AuthenticationBoth FTP and SFTP support various user authentication methods, including usernames and passwords.User authentication is a shared feature ensuring secure access to the servers.
Port ConfigurationBoth protocols can be configured to use different ports, allowing users to customize their connections.Port customization is possible in both FTP and SFTP to accommodate network setups.
Cross-PlatformFTP and SFTP are cross-platform solutions compatible with various operating systems and software applications.Both protocols are versatile and work on multiple platforms and client applications.
Table 1: Similarities between FTP and SFTP

Pros and Cons of FTP:

Simplicity: FTP is straightforward to set up and use, making it accessible to beginners.Security Risks: FTP lacks encryption, making data vulnerable to interception and unauthorized access.
Comprehensive Support: FTP enjoys broad support across various operating systems and software applications.Limited Security: FTP’s reliance on usernames and passwords can lead to security vulnerabilities if misconfigured.
Portability: FTP is compatible with numerous devices and platforms, offering flexibility for file transfers.Firewall Challenges: FTP may require complex firewall configurations due to its use of multiple ports.
Speed: In some cases, FTP can provide faster transfer speeds, particularly for large files.Data Integrity: FTP lacks built-in integrity checks, necessitating additional measures to ensure data integrity.
Directory Listing: FTP lets users list remote directories, aiding navigation and file management.Limited Authentication: FTP primarily relies on traditional username and password authentication, which can be less secure.
Table 2: Pros and Cons of FTP

Pros and Cons SFTP:

Enhanced Security: SFTP encrypts data during transmission, safeguarding it against interception and unauthorized access.Complexity: Setting up SFTP can be more complex, requiring SSH keys and additional configuration steps.
Strong Authentication: SFTP offers robust authentication methods, including SSH keys, enhancing user security.Port Customization: While SFTP simplifies firewall setups, it typically uses a fixed port (22), which may only be ideal for some situations.
Firewall-Friendly: SFTP’s single port simplifies firewall configurations, reducing potential issues.Compatibility: While SFTP is widely supported, it may not be as universally compatible as FTP.
Data Integrity: SFTP automatically performs integrity checks, ensuring that transferred files remain intact.Learning Curve: Users unfamiliar with SSH keys may face a learning curve when adopting SFTP.
Secure File Transfers: SFTP is the preferred choice for secure and confidential file transfers, making it suitable for sensitive data.Potential Slower Speeds: Due to encryption overhead, SFTP transfers may sometimes be slower than FTP.
Table 3: Pros and Cons SFTP

Which One is better?

Whether FTP or SFTP is better depends on your specific needs and priorities. Each protocol has its strengths and weaknesses, and the choice should align with your particular requirements:

FTP may be a better choice if:

  • Simplicity: You require a straightforward and easy-to-use file transfer solution.
  • Broad Compatibility: You need a protocol that works across various platforms and software applications.
  • Portability: You want to quickly transfer files between different devices and operating systems.
  • Speed: Speed is critical, especially for large file transfers, and FTP sometimes provides faster speeds.

However, it’s essential to be aware of FTP’s security limitations. If you’re handling sensitive or confidential data, FTP’s lack of encryption and weaker authentication methods can pose significant risks.

SFTP is a better choice if:

  • Security: You prioritize the security and confidentiality of your data during transfer.
  • Strong Authentication: Robust authentication methods like SSH keys are crucial for your user access control.
  • Data Integrity: Ensuring that transferred files remain intact is a top concern.
  • Firewall-Friendly: You want a protocol that simplifies firewall configurations.

SFTP’s enhanced security features make it ideal for scenarios where data protection is critical. However, it may require more configuration and have a slight learning curve, particularly if you’re new to SSH keys and secure file transfers. Ultimately, the “better” choice between FTP and SFTP depends on your specific use case and your willingness to invest in security and configuration. SFTP is generally the recommended option for secure and confidential file transfers, but for less sensitive data and simplicity, FTP may suffice.


In summary, while FTP and SFTP serve the purpose of file transfer, their differences in security, authentication, portability, firewall-friendliness, and integrity checks set them apart. With its simplicity and comprehensive support, FTP may be suitable for non-sensitive data transfers. However, for secure and confidential file transfers, SFTP is a clear choice, offering encryption, robust authentication, and data integrity checks.

Ultimately, the decision between FTP and SFTP depends on your needs and security requirements. Understanding these key differences will help you make an informed choice to ensure your files’ safe and efficient transfer.

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