Packet Sender is licensed GPL v2 (source code on GitHub ) and thus can be used in commercial environments.

100% Free

No Ads. No bundles.


UDP and TCP. Send or receive.


Any data can be defined.


Windows, Mac, Linux.

Command Line

For automation / scripting

Persistent TCP

Stay connected while sending your data.

Common Uses

Packet Sender was designed to be very easy to use while still providing enough features for power users.

• Test automation

Using its command line tool

• Testing network APIs

Using the built-in TCP and UDP clients

• Malware analysis

using the built-in UDP and TCP servers

• Testing network connectivity/firewalls

by having 2 Packet Senders talk to each other

• Tech support

by sending customers a portable Packet Sender with pre-defined settings and packets

• Quality Assurance

Save and analyze the traffic log.


Windows XP through 10
Mac OS X (x64 Intel)
Linux Desktop (with Qt)
Command Line comes with all versions