Free tools
Small tools for file transfer work
Free, no sign-up. Check why a server won't connect, or make the SSH key your partner asked for.
SFTP & FTP connection tester
Check that an SFTP, FTP or FTPS server answers: DNS, TCP, SSH banner and algorithms, or FTP banner and TLS certificate, step by step.
Open the toolSSH key generator
Create an Ed25519 or RSA 4096 key pair in your browser, in OpenSSH format. The private key never leaves your device.
Open the tool
Testing a plain FTP or FTPS server? Use the FTP connection tester.