FTP vs SFTP vs FTPS: Choosing the Best Method for Secure Transfers
Compare FTP, SFTP, and FTPS to choose the right file transfer protocol for your website. See how each method differs in encryption, authentication, ports, firewall compatibility, and cPanel support, and why SFTP or FTPS is recommended for protecting files and login credentials.
Secure Transfers
Transferring files between computers and servers is essential for web developers, system administrators, and IT professionals. Not all file transfer protocols are equal: some offer no security, while others encrypt every byte of data. This guide compares FTP, SFTP, and FTPS so you can choose the best option for your setup.
What Are FTP, SFTP, and FTPS?
FTP is the original protocol for transfers over TCP/IP. It is simple and fast, but it does not encrypt usernames, passwords, or file contents. Data is sent in plain text and can be intercepted on insecure networks.
FTPS is FTP with SSL/TLS encryption. It works like FTP but protects login credentials and file contents. It supports explicit and implicit modes using TLS or SSL certificates.
SFTP is not FTP over SSH. It is a separate protocol that runs over SSH. It encrypts commands and data and supports directory listings and remote file management.
Protocol Comparison
The choice depends on security needs, network environment, and compatibility.
Security
- FTP: clear text, insecure for sensitive transfers.
- FTPS: SSL/TLS encrypts credentials and files.
- SFTP: SSH encrypts data and control channels.
Ports
- FTP: port 21 plus dynamic data ports.
- FTPS: 21 explicit or 990 implicit, plus data ports.
- SFTP: single port 22, simpler firewalls.
Support
- FTP: widely supported, outdated for modern use.
- FTPS: good for legacy FTP systems that need encryption.
- SFTP: common on Unix/Linux and modern secure workflows.
Key Differences at a Glance
| Feature | FTP | FTPS | SFTP |
|---|---|---|---|
| Encryption | No | SSL/TLS | SSH |
| Default Port | 21 | 21 / 990 | 22 |
| Data + Commands | Separate channels | Separate channels | Single encrypted channel |
| Firewall Friendly | No | Complex | Yes |
| Authentication | User/Pass | User/Pass + certificates | User/Pass + SSH keys |
Why this matters: Unencrypted FTP exposes usernames, passwords, and file contents. On public or cloud networks that can lead to credential theft. FTPS and SFTP encrypt data in transit. In regulated industries, encrypted transfer is often required under frameworks such as HIPAA, GDPR, or PCI-DSS.
When to Choose Each Protocol
Use only on controlled internal networks when encryption is not required and content sensitivity is low.
- Legacy systems that expect plain FTP
- Non-sensitive internal backups
- Sites behind a secure VPN
Use when you need encryption but must stay compatible with existing FTP clients or services.
- Partners with legacy FTP infrastructure
- Windows environments with SSL/TLS support
- Transfers that require SSL/TLS certificates
Often the preferred choice for secure, modern, firewall-friendly transfers.
- Linux/Unix cloud servers
- Automated backups and scripts
- SSH key authentication
How to Use These Protocols
Most modern clients (FileZilla, WinSCP, Cyberduck) support all three. To connect:
- Select the protocol in the client’s connection settings.
- Enter the host, username, and password.
- For FTPS, confirm the server has a valid SSL/TLS certificate.
- For SFTP, confirm SSH access is enabled (port 22) and consider SSH keys.
Always test the connection first so firewall rules and certificates are confirmed before you transfer files.
Summary
Plain FTP is simple but insecure. FTPS adds encryption to legacy FTP workflows. SFTP offers a single encrypted channel that is usually the best fit for modern servers. Match the protocol to your security requirements, compatibility needs, and network setup. Securing FTP Transfers · Using SFTP with cPanel · Uploading Files with FTP
Frequently Asked Questions
Is SFTP just FTP running over SSH?
No. SFTP is a separate SSH file-transfer protocol, not encrypted FTP. It uses one channel, usually port 22, and needs SSH access. FTPS is the version that keeps the FTP model and adds SSL/TLS. In an FTP client, pick SFTP or FTP with TLS as different protocol options. A short background piece is what FTP is.
Which protocol should I use with a new cPanel FTP account?
Use explicit FTPS when the host supports TLS for that extra login. A separately created FTP user generally cannot log in with SFTP. SFTP is for the primary cPanel account or another SSH-enabled system user after SSH is turned on. If SFTP fails with name@yourdomain.com, switch the client to FTP with TLS on port 21. Account setup is covered in creating an FTP account.
What is the difference between explicit and implicit FTPS?
Explicit FTPS starts on port 21 and upgrades the session to TLS after connect, which is what most cPanel servers expect. Implicit FTPS wraps the connection from the first packet and often uses port 990. If the client is set to implicit and the server only offers explicit, the login fails. Choose “FTP - File Transfer Protocol” with “Require explicit FTP over TLS” unless your host documents port 990.
Why does FTPS stall on a firewall when SFTP connects?
FTPS still uses a control port plus separate data ports, so firewalls and NAT devices can block the directory listing. SFTP stays on a single SSH port, usually 22, which is easier to allow. Enable Passive mode for FTPS first. If listings still fail, ask the host which data ports FTPS uses, or use SFTP when SSH is available. More hardening tips are in securing FTP transfers.
Is plain FTP faster than SFTP or FTPS?
FTP can feel slightly quicker because it skips encryption, but the difference is rarely worth the risk on a public network. Passwords and file contents travel in clear text. For website files, themes, and backups, use FTPS or SFTP. Any extra time from TLS or SSH is small compared with the cost of a leaked login. Encryption terms are outlined in encryption basics.
Can Windows File Explorer use SFTP or FTPS?
File Explorer can map a basic FTP location, but it is a poor choice for FTPS controls and it does not provide a full SFTP client. Use FileZilla, WinSCP, or Cyberduck when you need TLS, SSH keys, a transfer queue, or resume. Save the protocol in Site Manager so you do not fall back to plain FTP by habit. Client options are compared in choosing an FTP client.
Why does my client warn about the FTPS certificate?
The certificate is often issued for the server hostname, not your domain. Connecting to ftp.yourdomain.com can trigger a name mismatch even when the host is legitimate. Use the hostname shown in cPanel or the welcome email, then verify the certificate details before you accept it. Do not ignore a warning on a network you do not trust. SFTP setup steps are in using SFTP with cPanel.
Which protocol is better for automated backups?
SFTP is usually easier to script because it uses one port and can authenticate with SSH keys. FTPS works when the extra cPanel FTP user has no SSH access, as long as the script supports TLS and Passive mode. Avoid unattended plain FTP. Store credentials outside the web root and test a manual run first. Related guides are listed on the blog index.
FTP Learning Resources and How To Instructions
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