Simple MTU Test for Windows

What this tool does for your Windows network

Simple MTU Test is a lightweight Windows utility that helps you discover the best Maximum Transmission Unit (MTU) for a given connection. By checking how different packet sizes travel across the network, it identifies MTU values that avoid fragmentation and reduce latency for both standard and large-packet transfers.

How the test is performed

• The program sends ping requests using a range of packet sizes and monitors which sizes pass without being fragmented.
• It reports the largest packet size that succeeds, giving you a recommended MTU to set on your interface.
• The utility can test support for jumbo frames, so you can determine if larger-than-standard MTUs will improve throughput on your link.

Reasons to use it

• Reduces packet fragmentation, which can improve speed and reliability.
• Simplifies diagnosis when connections suffer slowdowns or intermittent failures tied to incorrect MTU settings.
• Quick and easy to run thanks to an uncluttered interface — suitable for fast troubleshooting.

Who benefits from this utility

Network administrators, support technicians, and experienced home users who want to tune network performance or troubleshoot packet-size related issues will find it especially useful. Its simplicity makes it accessible, while the results provide actionable configuration changes.

Availability and cost

Simple MTU Test is free to use on Windows systems, making it a convenient addition to any diagnostic toolbox without licensing concerns.

Alternative option

Auslogics Registry Defrag (Free) — while not an MTU diagnostic tool, it’s a recommended free utility for system maintenance and registry optimization if you’re also looking to keep Windows running smoothly alongside network tuning.