Does Signal train on your data?
Signal's own policy says it cannot decrypt or access the content of your messages or calls. Not a promise not to train on them — a statement that they are not readable to Signal at all.
Your content is not readable to them
"Signal cannot decrypt or otherwise access the content of your messages or calls."
- 1 Aug 2026
- 5 Oct 2026
- All accounts
- global
- Internet Archive copy
- F043C519…54F1
How we read it: Signal's policy contains no training, machine-learning or AI language anywhere: searched on 1 August 2026 for train, training, fine-tune, machine learning, artificial intelligence, AI model and large language model, with no match in a training sense. That absence is why this read UNCLEAR until the A rule was written, and it is the wrong question to ask of a service that cannot read the content: the same document says three separate times that Signal cannot reach it. What Signal does hold is stated plainly there and sits outside this grade's scope — the phone number you register, and "randomly generated authentication tokens, keys, push tokens" held on its servers to route messages.
What each plan can refuse
The same questions, asked of every plan we could identify. Every cell comes from a quoted clause or a documented search - see the evidence above.
- Nothing to opt out of
- Not stated
- 5 / 100
- Not stated
- No
How to opt out of Signal AI training
Plan by plan, from what Signal's own policy says about refusing. Where it publishes the steps, they're listed here with the limits they carry. Where there's nothing to switch off, or nothing graded, this says so instead of inventing a menu path.
All accounts
There is nothing to opt out of. Signal's own policy says it can't reach the content, so training on it isn't something a setting controls.
What this policy has done since we started watching
The record starts here. Signal's policy was first captured on 1 Aug 2026, and there's no earlier copy to compare it against, so this verdict has no history behind it yet. From now on every re-read is diffed against that copy, and anything that moves appears here.
Everything we read
Vendor response
We haven't yet written to Signal about this verdict, and they haven't disputed, clarified or announced a change to any clause quoted above. When either happens it's published here, word for word.
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