diff --git a/AGENTS.md b/AGENTS.md
index 8248fa8..29f8e92 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -2,7 +2,7 @@
 
 ## Overview
 
-Indonesian Telegram bot for group profile enforcement (photo + username), captcha verification, and anti-spam protection. Built with python-telegram-bot v20+, SQLModel, Pydantic, and Logfire.
+Indonesian Telegram bot for multi-group profile enforcement (photo + username), captcha verification, and anti-spam protection. Built with python-telegram-bot v20+, SQLModel, Pydantic, and Logfire.
 
 ## Commands
 
@@ -40,6 +40,7 @@ PythonID/
 │   ├── main.py           # Entry point + handler registration (priority groups!)
 │   ├── config.py         # Pydantic settings (get_settings() cached)
 │   ├── constants.py      # Indonesian templates + URL whitelists (528 lines)
+│   ├── group_config.py   # Multi-group config (GroupConfig, GroupRegistry)
 │   ├── handlers/         # Telegram update handlers
 │   │   ├── captcha.py    # New member verification flow
 │   │   ├── verify.py     # Admin /verify, /unverify commands
@@ -57,7 +58,7 @@ PythonID/
 │   └── database/
 │       ├── models.py     # SQLModel schemas (4 tables)
 │       └── service.py    # DatabaseService singleton (645 lines)
-├── tests/                # pytest-asyncio (18 files, 100% coverage)
+├── tests/                # pytest-asyncio (18 files, 99% coverage)
 └── data/bot.db           # SQLite (auto-created, WAL mode)
 ```
 
@@ -71,17 +72,19 @@ PythonID/
 | Change config | `config.py` | Pydantic BaseSettings with env vars |
 | Add URL whitelist | `constants.py` → `WHITELISTED_URL_DOMAINS` | Suffix-based matching |
 | Add Telegram whitelist | `constants.py` → `WHITELISTED_TELEGRAM_PATHS` | Lowercase, exact path match |
+| Multi-group config | `group_config.py` | GroupConfig model, GroupRegistry, groups.json loading |
 
 ## Code Map (Key Files)
 
 | File | Lines | Role |
 |------|-------|------|
-| `database/service.py` | 645 | **Complexity hotspot** - handles warnings, captcha, probation state |
-| `constants.py` | 528 | Templates + massive whitelists (Indonesian tech community) |
-| `handlers/captcha.py` | 365 | New member join → restrict → verify → unrestrict lifecycle |
-| `handlers/verify.py` | 344 | Admin verification commands + inline button callbacks |
-| `handlers/anti_spam.py` | 327 | Probation enforcement with URL whitelisting |
-| `main.py` | 293 | Entry point, logging, handler registration, JobQueue setup |
+| `group_config.py` | 250 | Multi-group config, registry, JSON loading, .env fallback |
+| `database/service.py` | 671 | **Complexity hotspot** - handles warnings, captcha, probation state |
+| `constants.py` | 530 | Templates + massive whitelists (Indonesian tech community) |
+| `handlers/captcha.py` | 375 | New member join → restrict → verify → unrestrict lifecycle |
+| `handlers/verify.py` | 358 | Admin verification commands + inline button callbacks |
+| `handlers/anti_spam.py` | 326 | Probation enforcement with URL whitelisting |
+| `main.py` | 315 | Entry point, logging, handler registration, JobQueue setup |
 
 ## Architecture Patterns
 
@@ -98,6 +101,13 @@ group=1   # message_handler: Runs LAST, profile compliance check
 - `get_database()` — DatabaseService, lazy init
 - `BotInfoCache` — Class-level cache for bot username/ID
 
+### Multi-Group Support
+- `GroupConfig` — Pydantic model for per-group settings (warning thresholds, captcha, probation)
+- `GroupRegistry` — O(1) lookup by group_id, manages all monitored groups
+- `groups.json` — Per-group config file; falls back to `.env` for single-group mode
+- `get_group_config_for_update()` — Helper to resolve config for incoming Telegram updates
+- Exception-isolated loops — Per-group API calls wrapped in try/except to prevent cross-group failures
+
 ### State Machine (Progressive Restriction)
 ```
 1st violation → Warning with threshold info
@@ -179,3 +189,7 @@ if user.id not in admin_ids:
 - JobQueue auto-restriction job runs every 5 minutes (first run after 5 min delay)
 - Bot uses `allowed_updates=["message", "callback_query", "chat_member"]`
 - Captcha uses both `ChatMemberHandler` (for "Hide Join" groups) and `MessageHandler` fallback
+- Multi-group: handlers use `get_group_config_for_update()` instead of `settings.group_id`
+- Captcha callback data encodes group_id: `captcha_verify_{group_id}_{user_id}` to avoid ambiguity
+- Scheduler iterates all groups with per-group exception isolation
+- DM handler scans all groups in registry for user membership and unrestriction
diff --git a/README.md b/README.md
index 0cf674a..8e0ed41 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,8 @@ A comprehensive Telegram bot for managing group members with profile verificatio
 ## Features
 
 ### Core Monitoring
-- Monitors all messages in a configured group
+- Monitors all messages in one or more configured groups
+- **Multi-group support**: Manage multiple groups from a single bot instance with isolated per-group settings via `groups.json`
 - Checks if users have a public profile picture
 - Checks if users have a username set
 - Sends warnings to a dedicated topic (thread) for non-compliant users
@@ -101,6 +102,49 @@ WARNING_TIME_THRESHOLD_MINUTES=180
 RULES_LINK=https://t.me/yourgroup/rules
 ```
 
+### 6. Multi-Group Configuration (Optional)
+
+To manage multiple groups from a single bot instance, use a `groups.json` configuration file:
+
+```bash
+cp groups.json.example groups.json
+```
+
+Add `GROUPS_CONFIG_PATH=groups.json` to your `.env` file, then edit `groups.json`:
+
+```json
+[
+  {
+    "group_id": -1001234567890,
+    "warning_topic_id": 123,
+    "restrict_failed_users": false,
+    "warning_threshold": 3,
+    "warning_time_threshold_minutes": 180,
+    "captcha_enabled": false,
+    "captcha_timeout_seconds": 120,
+    "new_user_probation_hours": 72,
+    "new_user_violation_threshold": 3,
+    "rules_link": "https://t.me/pythonID/290029/321799"
+  },
+  {
+    "group_id": -1009876543210,
+    "warning_topic_id": 456,
+    "restrict_failed_users": true,
+    "warning_threshold": 5,
+    "warning_time_threshold_minutes": 60,
+    "captcha_enabled": true,
+    "captcha_timeout_seconds": 180,
+    "new_user_probation_hours": 168,
+    "new_user_violation_threshold": 2,
+    "rules_link": "https://t.me/mygroup/rules"
+  }
+]
+```
+
+When `groups.json` is present, per-group settings override the `.env` defaults. Each group can have its own warning thresholds, captcha settings, probation rules, and rules link.
+
+**Backward compatibility**: If no `groups.json` is configured (i.e., `GROUPS_CONFIG_PATH` is not set), the bot falls back to single-group mode using `GROUP_ID`, `WARNING_TOPIC_ID`, and other settings from `.env`.
+
 ## Installation
 
 ```bash
@@ -150,12 +194,12 @@ uv run pytest -v
 ### Test Coverage
 
 The project maintains comprehensive test coverage:
-- **Coverage**: 99% (1,216 statements)
-- **Tests**: 404 total
-- **Pass Rate**: 100% (404/404 passed)
+- **Coverage**: 99% (1,396 statements)
+- **Tests**: 442 total
+- **Pass Rate**: 100% (442/442 passed)
 - **All modules**: 100% coverage including JobQueue scheduler integration, captcha verification, and anti-spam enforcement
-  - Services: `bot_info.py` (100%), `scheduler.py` (100%), `user_checker.py` (100%), `telegram_utils.py` (100%), `captcha_recovery.py` (100%)
-  - Handlers: `anti_spam.py` (100%), `captcha.py` (100%), `check.py` (100%), `dm.py` (100%), `message.py` (100%), `topic_guard.py` (100%), `verify.py` (100%)
+  - Services: `bot_info.py` (100%), `group_config.py` (97%), `scheduler.py` (100%), `user_checker.py` (100%), `telegram_utils.py` (100%), `captcha_recovery.py` (100%)
+  - Handlers: `anti_spam.py` (100%), `captcha.py` (100%), `check.py` (98%), `dm.py` (100%), `message.py` (100%), `topic_guard.py` (100%), `verify.py` (100%)
   - Database: `service.py` (100%), `models.py` (100%)
   - Config: `config.py` (100%)
   - Constants: `constants.py` (100%)
@@ -192,13 +236,16 @@ PythonID/
 │   ├── test_scheduler.py     # JobQueue scheduler tests
 │   ├── test_telegram_utils.py
 │   ├── test_topic_guard.py
+│   ├── test_group_config.py
 │   ├── test_user_checker.py
-│   └── test_verify_handler.py
+│   ├── test_verify_handler.py
+│   └── test_whitelist.py
 └── src/
     └── bot/
         ├── main.py              # Entry point with JobQueue integration
         ├── config.py            # Pydantic settings
         ├── constants.py         # Shared constants
+        ├── group_config.py      # Multi-group configuration (GroupConfig, GroupRegistry)
         ├── handlers/
         │   ├── anti_spam.py     # Anti-spam handler for probation users
         │   ├── captcha.py       # Captcha verification handler
@@ -412,6 +459,7 @@ The bot is organized into clear modules for maintainability:
   - `service.py`: Database operations with SQLite
   - `models.py`: Data models using SQLModel (UserWarning, PhotoVerificationWhitelist, PendingCaptchaValidation, NewUserProbation)
 - **config.py**: Environment configuration using Pydantic
+- **group_config.py**: Multi-group configuration management (GroupConfig model, GroupRegistry for O(1) lookup, groups.json loading with .env fallback)
 - **constants.py**: Centralized message templates and utilities for consistent formatting across handlers
 
 ### Group Message Monitoring
@@ -484,6 +532,7 @@ When a restricted user DMs the bot (or sends `/start`):
 | `LOGFIRE_ENABLED` | Enable Logfire logging integration | `true` |
 | `LOGFIRE_TOKEN` | Logfire API token (optional) | None |
 | `LOG_LEVEL` | Logging level (DEBUG/INFO/WARNING/ERROR) | `INFO` |
+| `GROUPS_CONFIG_PATH` | Path to `groups.json` for multi-group support | None (single-group mode from `.env`) |
 
 ### Restriction Modes