# Opt-outs

Visitors, developers running your installer, and you as the website owner can each turn attribution off, without breaking the website or the install.

## In the terminal

```sh
# Honoured by every tool that follows Console Do Not Track:
export DO_NOT_TRACK=1
# CLItrail only:
export CLITRAIL_DISABLE=1
```

With either set (to anything but empty, `0` or `false`), the hook exits with status 0 before it runs a command or reads a file. The install itself is unaffected. Downloading the hook at install time, as the one-liner does, still contacts your service before the hook can check these variables; bundling `clitrail.sh` with your package avoids that request. A prepared [handoff command](https://clitrail.com/docs/handoff) also downloads the hook, after your command succeeds.

- **CI.** The hook also exits straight away when it detects CI: `CI` set to anything but `false` or `0`, or `GITHUB_ACTIONS`, `GITLAB_CI`, `BUILDKITE`, `CIRCLECI`, `TF_BUILD` or `JENKINS_URL` set. `CLITRAIL_ALLOW_CI=1` overrides this, for testing your integration.
- **The notice.** In a terminal, the hook prints one line naming the website and how to turn it off. `CLITRAIL_QUIET=1` hides the line; it does not turn the hook off.
- **Check.** `sh clitrail.sh --doctor` shows whether an opt-out or CI was detected.

## In the browser

- **Global Privacy Control.** Visits made with GPC are never shared with ad platforms. See [Global Privacy Control](https://clitrail.com/docs/sdk#global-privacy-control).
- **Your consent choice.** Wire your consent banner to `enabled`; with `false` the SDK reads, stores and sends nothing. See [Consent and opt-out](https://clitrail.com/docs/sdk#consent-and-opt-out).
- **Clearing site data** or private browsing removes the receipt, so the install cannot be matched.

## For website owners

- Limit the identifiers read with the SDK's [`providers` option](https://clitrail.com/docs/sdk#start-it-yourself).
- Turn [reconstruction](https://clitrail.com/docs/reconstruction) off in **Settings → Attribution**.
- Keep destinations in test mode, or remove them: nothing leaves CLItrail without a live destination.
- Shorten the [retention period](https://clitrail.com/docs/retention), export, or delete a website and its data at any time.