# Force Variants {% embed url="" %}

The Force Variant feature lets you send users to a specific variant directly using a URL parameter. This is useful when you want a controlled group of users (like ad traffic) to always see the same version of a test. *** ### Common use cases * A/B testing multiple ad campaigns with fixed landing page content * Running a demo or client presentation that always shows a specific variant * QA and debugging specific variant setups *** ### How it works To force a variant, Optibase uses a special URL parameter: ``` optibaseVariants=test_id:variant_id ``` When a user visits a page with this parameter in the URL, Optibase will: * Bypass random variant selection * Show the specified variant * Maintain this variant for the user for the duration of the session *** ### How to generate a Force Variant URL 1. Go to the Variants tab inside your test in the Optibase dashboard 2. Click the Preview / Force icon next to the variant you want to force 3. A modal will appear with two options: * Preview: Opens the URL for manual testing * Force: Generates a link with the variant forced via query param 4. Enter the URL where the test will run 5. Click Copy to copy the full forced URL Example URL: ``` https://example.com?optibaseVariants=header_text:variant_b ``` When users visit this link, they will be shown variant\_b of the header\_text test. *** ### Forcing multiple variants You can force multiple variants from different tests by chaining them using a semicolon: ``` optibaseVariants=header_text:variant_b;footer_cta:variant_a ``` Each test\_id:variant\_id pair should be separated with ;. *** ### Notes * Force Variant overrides random selection but only applies during that session * This does not affect test data or variant assignment for other users * Users who receive a forced variant still count as Tested Users and trigger conversions as normal