Relay Capital

Gmail conversation references

How to Find a Gmail Thread ID

Use a Gmail thread ID when you need to point to the full conversation rather than one exact message.

Short answer

Open the Gmail conversation and click the thread-level ID button from Gmail Message ID & Thread ID Copier. The extension copies a gmail-thread-id: locator when Gmail exposes a usable thread ID.

Gmail open thread with ID button for copying a thread locator

When to use a thread ID

Thread IDs are useful for AI assistants, support investigations, CRM timelines, and legal or diligence review where the surrounding replies matter as much as the individual email.

Message ID or thread ID?

  • Use a message ID when one exact email is the evidence.
  • Use a thread ID when the whole conversation is the evidence.
  • Use a thread URL fallback only when Gmail does not expose a stable API thread ID.

Open the Gmail Message ID & Thread ID Copier page