Account Switcher with Cookies (Forge / Fabric / Lunar / Localts)

A fork of In-Game Account Switcher with support for Forge, Fabric, Lunar Fabric, and Localts cookie alt files. Switch Minecraft accounts in-game without restarting, and add Microsoft accounts by importing cookie files exported from Localts or standard Netscape cookie dumps.

• Localts import — single-line M.C… Microsoft refresh tokens (Localts export format) are detected and exchanged for a full Minecraft session.
• Netscape cookie import — tab-separated browser cookie exports with __Host-MSAAUTH / __Host-MSAAUTHP still work via Xbox SISU.
• Checker dump import — one .txt with many Source: / Netscape / -------- blocks becomes one account per block. Dead alts fail individually.
• Bulk Import — drop files in .minecraft/config/cookieias/import and import them from the account manager.
• Live session swap — logging into a cookie alt actually becomes that account.
• HttpOnly Netscape cookies — #HttpOnly_ lines are kept (__Host-MSAAUTH, MSPAuth, WLSSID, …).
• Token login — import Minecraft access tokens from files or paste.
• Multi-file cookie import — the file picker can select several alt files at once.
• Lunar Client support — keyboard shortcut (O by default) and Mod Menu entry work on Lunar's custom main menu where the vanilla title button does not appear.
• Direct Play bypass buttons — Singleplayer world list and Multiplayer direct-connect (server IP) shortcuts on the account switcher screen, to bypass Lunar's account-check gate.
• No encryption prompt on cookie import — cookie imports skip the Crypt selection screen and are stored unencrypted.

If you need cookie alts on Lunar Client 1.8.9, check out my injectable tool here https://github.com/naczo5/lunar-cookies

Fabric (Lunar): Fabric API (required), Mod Menu (recommended)

1. Install Forge for 1.8.9.
2. Copy forge-1.8\build\libs\CookieIAS-3.3+1.8.9-forge.jar into the instance's mods folder.
3. Open the account switcher from its title-screen button or press O.

1. Use a Fabric or Lunar Fabric profile matching one of the supported versions above.
2. Copy the matching jar from build\libs\ into the profile mods folder, or install via the Lunar launcher mod browser.
3. Ensure Fabric API is present for that Minecraft version.

See docs/LUNAR.md for Lunar Fabric setup and troubleshooting.

1. Open the account switcher — press O (default keybind, changeable under Controls → In-Game Account Switcher) on the main menu, or open Mod Menu → In-Game Account Switcher.
2. Add → Import Cookie.
3. Choose how to supply the file:
   • File Path — path to your .txt alt file, e.g. C:\alts\myaccount.txt, or click ... to open the OS file picker (multiple files are allowed)
   • Paste — paste the full cookie file into the multi-line text box, or leave it empty and click Import to use the clipboard

If import fails, check latest.log in your instance folder and search for IAS/Cookie.

Place personal alt files in a local cookies/ folder (gitignored) — never commit them.

Q: The mod button doesn't show on the main menu. A: Press O or use Mod Menu (Fabric profiles). On 1.8.9, use the title-screen button or O.

Q: Cookie import says expired or invalid.
A: Localts tokens and session cookies expire or get revoked. Export a fresh alt from Localts and import again.

Q: Will Check Hypixel IP-ban my main?
A: Banned no-rank accounts can IP-ban the connecting IP. By default the checker will not join unranked/unknown-rank alts from your machine. Ranked (VIP+) alts still do a local join. To check no-rank alts, use a proxy in config/cookieias/ias.json:

"hypixelCheckProxy": "",
"liquidProxyHost": "",
"liquidProxyPort": 1080,
"liquidProxyUsername": "",
"liquidProxyPassword": "",
"liquidProxyType": "socks5",
"liquidProxyRoute": "",
"hypixelApiKey": ""

hypixelCheckProxy is a generic SOCKS5 or HTTP proxy (socks5://user:pass@host:1080). The liquidProxy* fields are optional LiquidProxy credentials. hypixelApiKey is optional and only used to read package rank before joining. If Hypixel returns an IP/network block, remaining accounts are not joined.

Q: Can I use normal Microsoft login instead of cookies?
A: Yes. Add → Microsoft still works and lets you choose password or hardware encryption.

Q: Where is this fork hosted?
A: GitHub — naczo5/Account-Switcher-with-Cookies. Upstream IAS: Modrinth, CurseForge.

Q: Is this mod open source?
A: Yes, under GNU LGPLv3, same as upstream IAS.

# 26.3 Fabric / Lunar Fabric
$env:GRADLE_OPTS = "-Dru.vidtu.ias.only=26.3-fabric"
.\gradlew.bat :26.3-fabric:jar

# 26.2 Fabric / Lunar Fabric
$env:GRADLE_OPTS = "-Dru.vidtu.ias.only=26.2-fabric"
.\gradlew.bat :26.2-fabric:jar

# 1.21.11 Fabric
$env:GRADLE_OPTS = "-Dru.vidtu.ias.only=1.21.11-fabric"
.\gradlew.bat :1.21.11-fabric:remapJar

# 1.8.9 Forge (standalone module — requires JDK 8)
cd forge-1.8
.\gradlew.bat build
cd ..

Built jars appear in build\libs\.

• Originally by VidTu, The_Fireplace, and IAS contributors.
• Cookie authentication fork, Localts integration, Hypixel checks, and 1.8.9 Forge backports by naczo5.
• Checker-dump import, live session swap, Hypixel IP-ban protection, and optional LiquidProxy by antlmao1337.
• Profile management, skin updating, and multi-file selection features by Articuling / xCheezie.
• Hypixel ban-check logic adapted from mcchecker by cooldood-dev.

Microsoft authentication flow references: minecraft.wiki/Microsoft_authentication.