How to Run Multiple Roblox Accounts on One PC with a Multi Instance Setup

Video: Multi Roblox on ONE PC (2026) | How to Run Multiple Roblox Accounts at Once — Full Setup Guide

Oct 15, 2026 · based on the channel Gamesmer

Running multiple Roblox accounts on one PC means launching several separate Roblox clients at the same time, each logged into a different account, so your main and alt sessions stay online simultaneously. The setup shown by the Gamesmer channel uses a browser extension plus the RBX Multi tool, which you get from the official Multi Roblox page, and it takes only a few minutes on Windows. Once installed, you start your first Roblox session as usual and then open a second session with another account.

What multiple Roblox accounts on one PC actually means

A standard Roblox install refuses to open twice: the client detects the running process and focuses the existing window instead of starting a new one. Multi instance tools solve this by launching independent Roblox clients from separate installation paths, so each window keeps its own login session, its own cookies, and its own game state.

That matters for a few common workflows:

• Alt account farming in games where progress is tied to time online, such as Pet Simulator 99 or Grow a Garden-style loops.
• Testing your own experiences as a player while your main account stays in a live server.
• Trading, group management, and inventory work that requires two accounts visible at once.
• Recording or streaming with a second account parked in the same server.

The tool does not merge accounts and does not bypass Roblox login — you still sign into each account normally, one per window.

Preparing your PC before installing a multi instance tool

Before you install anything, close every running Roblox process, including the background RobloxPlayerBeta and the Microsoft Store version if you have it, because two clients fighting over the same files is the most common cause of a failed first launch. Also make sure you are signed into Windows with an account that can run scripts, since the installer uses PowerShell.

A short checklist:

1. Update Windows and your GPU drivers so each extra Roblox window has a stable renderer.
2. Close Roblox completely and confirm no Roblox entries remain in Task Manager.
3. Keep at least a few gigabytes of free disk space, because each instance may copy client files.
4. Note your Roblox account credentials for the main and the alt account you plan to run.
5. Disable aggressive antivirus real-time scanning temporarily if it blocks the installer, then re-enable it.

On low-end machines, plan for lower graphics settings per window: two Roblox clients roughly double CPU and RAM load, and the GPU has to render two scenes.

Step by step: installing the browser extension and RBX Multi

The setup splits into two parts — a browser extension that handles the account side, and the RBX Multi tool that handles the client side. Install them in that order.

1. Open your browser and add the extension linked in the tutorial. It is the piece that lets you manage and switch between the accounts you will use for each Roblox instance.
2. Complete the extension setup: pin it to the toolbar and sign in or add the accounts you want available for launching.
3. Open the Multi Roblox page at https://rbxmulti.s.gy/ and download the RBX Multi tool.
4. Run the installer through PowerShell as shown on screen. Windows may warn about running a script downloaded from the internet; the video walks through confirming the prompt.
5. Wait for the tool to finish setting up its own Roblox client files. Do not launch Roblox manually during this stage.
6. When the tool reports it is ready, you will have a launch interface that starts one Roblox session per account.

If PowerShell refuses to run the script, the usual fix is the execution policy: allow scripts for the current user, or run the installer from an elevated PowerShell window.

Launching two Roblox sessions with different accounts

With the tool installed, the workflow is deliberately simple: pick an account, launch a session, then repeat with the second account. The tutorial demonstrates joining the same game from both windows.

1. Choose your main account in the extension or tool interface and hit launch. Roblox opens in its own window and signs in as that account.
2. Join the game you want to play, or leave the account idle in the lobby if you are farming time-based progress.
3. Switch back to the launcher, select the alt account, and start a second session.
4. A second Roblox window appears, logged into the alt account. Join the same experience from this window.
5. Arrange the windows side by side so you can watch both sessions, and lower graphics quality in each if the frame rate drops.

This is the same pattern people describe as playing Roblox on two accounts at the same time, multiboxing Roblox, or running a Roblox account manager: one launcher, multiple isolated clients, one account each.

Common problems and how to fix them

The most frequent complaint about multi instance setups is that the second window never appears, or that it opens already logged into the first account. Both usually trace back to the same causes.

• Only one window opens: Roblox is still running from a normal install. Close every Roblox process and launch only through the multi instance tool.
• Both windows share one account: the sessions are not isolated. Reinstall the tool so it creates separate client folders, and log in manually in the second window.
• The tool stops working after a Roblox update: client updates can break the launch method. Check for an updated build of the tool before assuming it is broken.
• Antivirus deletes or quarantines files: add an exclusion for the tool folder, then reinstall.
• Very low frame rate with two windows: cap the frame rate, drop render distance and shadows, and close background apps. On weaker hardware, two instances may simply be too much.
• Account flagged or logged out repeatedly: avoid launching many sessions from the same network at once, and keep each account's activity reasonable.

Treat any third-party launcher as software you are trusting with your Roblox session: use accounts you can afford to lose, keep your password unique, and enable two-step verification on the account itself.

Useful links

• Multi Roblox tool download and setup page: https://rbxmulti.s.gy/
• Gamesmer Discord community for troubleshooting and updates: https://discord.gg/QqRNtmeUv

Final thoughts on running multiple Roblox accounts

Multi instance setups are the practical answer to running multiple Roblox accounts on one PC: a browser extension handles account selection, and the RBX Multi tool launches isolated Roblox clients so each window stays logged in separately. The whole process — extension, PowerShell install, first session, second session — fits into a few minutes, and the video from the Gamesmer channel demonstrates each screen so you can follow along without guessing. Keep expectations realistic: two clients cost real CPU, RAM, and GPU headroom, and Roblox updates can temporarily break any third-party launcher. If you want the exact build shown in the walkthrough, start from the Multi Roblox download page and join the Discord if a step fails.

Source: Multi Roblox on ONE PC (2026) | How to Run Multiple Roblox Accounts at Once — Full Setup Guide · Markdown version