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Free for Windows 10 and 11

The free LAN messenger that needs no server.

Chat, call and send files to everyone on your local network. Install it on each PC and they find each other in seconds — no server to set up, no account to create, and nothing ever leaves your building.

Get it from Microsoft Questions?

Free · No ads · No subscription · No per-seat licence

TRIBAND LAN Messenger showing a voice call in progress alongside the chat history and a completed file transfer
Getting Started

Working in under a minute

  1. 01

    Install on every PC

    Get it free from the Microsoft Store on each computer that should be able to chat.

  2. 02

    Allow private networks

    Windows asks once for firewall access. It is only ever requested for private and domain networks.

  3. 03

    Start talking

    Everyone running it on the network appears automatically. Pick a name and send the first message.

Why It Is Different

Your office chat, without the cloud

Built for offices, workshops, studios, clinics, schools and sites that have a network but would rather their conversations and files never touched the internet.

Works when nothing else does

The internet going down does not affect it. Nothing is hosted or synced, and no cloud service can fail, change its pricing or close your account.

Nothing to set up

No server component, no administrator console, no IP addresses to type. Computers discover each other over the local network.

Send anything, at any size

Files and whole folders go straight to the other PC at full network speed. Every transfer is SHA-256 verified, and an interrupted one resumes rather than restarts.

Talk and share your screen

Call anyone on the network and share your screen while you talk. Audio and screen travel directly between the two computers.

Private by construction

Traffic is encrypted with TLS 1.2 or 1.3 with certificate pinning. History is stored only on your own PC, with no telemetry, analytics or advertising.

Ready for a whole office

Group chats, a broadcast channel for announcements, polls, and contact folders to keep a long list of colleagues organised.

Screenshots

What it looks like

A private conversation with read receipts and a received file
Conversations with read receipts, and files delivered in the chat.
The transfers view showing a 340 MB file received and verified
A 340 MB transfer, received and SHA-256 verified.
  • Group chats
  • Broadcast channel for announcements
  • Polls with live results
  • Search across your whole history
  • Offline outbox — delivers when someone returns
  • Reactions, edit and delete
  • Paste screenshots straight into a chat
  • Add a PC by IP address across subnets
  • Optional start-up PIN
  • Light and dark themes
Compared

How it compares

Most LAN messengers are paid per seat, and several need a server installed somewhere on the network. Cloud chat tools need the internet and an account for every person.

TRIBAND LAN Messenger Typical paid LAN messenger Cloud chat
PriceFreePer-seat licencePer-user subscription
Server to installNoneOftenHosted by the vendor
Works without internetYesYesNo
AccountsNoneSometimesRequired
Where messages are keptYour own PCsVariesThe vendor’s servers
Questions

Frequently asked

Anything else? Email contact@triband.in, or read the privacy policy.

Yes. It is free to install on as many computers as you like. There is no subscription, no per-seat licence and no advertising.

Yes. It never connects to the internet. Computers talk to each other directly over your local network, so it keeps working when the internet is down.

No. There is no server component of any kind. Install it on each computer and they find each other automatically within a few seconds.

It only finds other computers running TRIBAND LAN Messenger on the same network, so install it on a second PC and both will appear. If the computers are on different subnets or VLANs, or on Wi-Fi with client isolation, add the other one by its IP address with the + button above the user list.

Traffic between computers is encrypted with TLS 1.2 or 1.3 with certificate pinning, file transfers are verified with SHA-256 at both ends, and message history is stored only on your own PC. There is no telemetry and no third party.

UDP 45820 for discovery, and TCP 45821, 45822 and 45825 for messages, file transfers and calls. All are configurable in Settings. Windows Firewall access is requested for private and domain networks only, never public.

Windows 10 version 1809 or later and Windows 11, 64-bit. Everything it needs is included; no runtime has to be installed first.

For managed deployment, email contact@triband.in.
Try It Now

Install it on two PCs and see for yourself

It takes under a minute, it costs nothing, and you will know straight away whether it suits your office.

Get it from Microsoft