# Instance Settings
URL: https://usememos.com/docs/admin/instance-settings

Instance settings control authentication, storage, and memo policies. Admins can update these settings in the app or via the Instance Settings API.

Common areas include:

* General access controls: user registration, password auth, username and nickname changes, week start day, and custom instance profile.
* Storage settings: database, local filesystem, or S3-compatible attachment storage, file path templates, and upload limits.
* Memo-related settings: content length limits, double-click editing, and allowed reaction values.
* Tag metadata: per-tag color and blur rules using exact names or anchored regular expression patterns.
* Notification settings: SMTP email delivery, sender details, reply-to address, and the email test endpoint.
* AI settings: instance-level OpenAI or Gemini providers and speech-to-text transcription defaults.

## Sensitive settings [#sensitive-settings]

Storage, notification, and AI settings can contain credentials. API responses do not return stored S3 secrets, SMTP passwords, or AI provider API keys in plaintext. When updating those settings, submit a new secret only when you intend to replace it.

## Related API [#related-api]

* [Get Instance Setting](/docs/api/latest/instanceservice/GetInstanceSetting)
* [Batch Get Instance Settings](/docs/api/latest/instanceservice/BatchGetInstanceSettings)
* [Update Instance Setting](/docs/api/latest/instanceservice/UpdateInstanceSetting)
* [Test Instance Email Setting](/docs/api/latest/instanceservice/TestInstanceEmailSetting)