> For the complete documentation index, see [llms.txt](https://guide.form.gov.sg/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.form.gov.sg/user-guides/advanced-guide/restricted-access.md).
# Restricted Access
**Can I restrict a form to certain users?**
The unique form link acts as a password. You can circulate the form link only to users that you intend to gather responses from. As long as you do not add the form link to public channels (e.g. website), it will not be indexed by search engines. If the form link ends up widely circulated with non-authorised users, you may then filter such non-authorised submissions after export.
See 3 other ways to restrict access to your form below.
{% tabs %}
{% tab title="Authentication" %}
You can use authentication to restrict your form responses and ensure that form responses are legitimate:
* [SingPass](/user-guides/advanced-guide/singpass-and-myinfo.md)/sgID
* 1 Submission per NRIC/FIN/UEN
* Whitelisted NRICs/FIN/UEN
* [Verified Emails](/user-guides/advanced-guide/email-confirmations-pdf-and-verification.md) (Including restricting form to certain email domains)
* [Verified SMSes](/user-guides/advanced-guide/verified-smses.md)
{% endtab %}
{% tab title="Response limit" %}
You may also limit number of responses your form can receive.
**Step 1: Click on settings**
**Step 2: Enable response limit**
**Step 3: Set a response limit**
When maximum number of responses have been reached, this will deactivate your form. You can still reactivate your form again if you need to receive more responses
{% endtab %}
{% endtabs %}
These methods are not mutually exclusive and may be combined. It depends on how many layers of restriction the form requires.
---
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