@doublegram_captcha_bot protects a Telegram group only after it is added and promoted with the correct permissions.
Step by step
- Open @doublegram_captcha_bot in Telegram.
- Press Start or send
/start. - Tap ➕ Add to a group (or use this add-to-group link).
- Select your supergroup (recommended over basic groups).
- When Telegram asks for admin rights, enable at minimum:
- Restrict members — required to mute, unmute, kick, and ban
- Confirm — the Telegram bot posts a ready message when promotion succeeds.
Critical: Without Restrict members, Captcha cannot mute new users or remove timed-out members. The bot will ask you to update permissions.
After a successful add
- The group is registered in the bot's database
- New members are handled automatically
- You can open Admin HQ for broader Doublegram admin tools
Supergroup vs regular group
If you add @doublegram_captcha_bot to a basic Telegram group, the bot warns that functionality may be limited. Convert to a supergroup in Telegram group settings for reliable muting.
If the bot loses admin
- The Telegram bot stops processing new members
- The group is removed from the active protection list
- Re-promote the bot with Restrict members to resume
Troubleshooting
- Nothing happens on join — Check admin list: @doublegram_captcha_bot must be administrator with Restrict members.
- Permission warning — Edit bot admin rights and turn on Restrict members.
- Regular group warning — Upgrade the chat to supergroup.
Quick reference
- Add: Start → Add to a group
- Permission: Restrict members (required)
- Best chat type: supergroup
Related: see what a new member experiences on join in What New Members See When Joining a Telegram Group.