The website link on your TikTok profile is where a tagged link to your own site goes on organic TikTok. Tag it utm_source=tiktok and utm_medium=social, and let utm_campaign say what the link is promoting this month. TikTok only lets an account add that link at 1,000 followers, or with a Verified Business Account.
The interactive UTM builder loads with this page, pre-filled for TikTok, and runs entirely in your browser.
With a medium of social, Organic Social is the only GA4 rule this link can match, even though Google's channel descriptions name TikTok as a video site.
Where to put it
Check the account qualifies for a profile link (see above).
In the TikTok app, tap Profile, then Edit profile, then Add next to Links, and paste the tagged URL.
Link straight to the page. TikTok opens profile links in its in-app browser and recommends direct links that reach the site in a few steps.
Link to websites only. TikTok no longer supports profile links that open or log people into other social apps; those apps' ordinary websites are still fine.
An account with 800 followers has no profile link to tag yet. TikTok holds the website link back until 1,000 followers or a Verified Business Account, and that link is where a tagged URL to your site goes. The link TikTok documents for videos is a TikTok Shop product link, and it opens a Product Details Page inside TikTok rather than your site. So until an account qualifies, TikTok documents no place for a tagged link at all.
Keep the path short. Taps on a profile link open in TikTok's in-app browser. TikTok says its safety measures limit how far people can browse through chains of external links there, and may show a prompt to open the page in the phone's own browser instead. Its advice is direct links that reach the intended site in a few steps. A short link that forwards to a tracking link that forwards to your page is exactly the kind of chain that warning is about. Run your link through the redirect checker, count the hops, and check the last URL in the chain still has every utm_ value on it. What is an in-app browser covers why these browsers behave differently.
Google's own pages disagree about TikTok. GA4's channel descriptions give TikTok as an example of a video site, alongside YouTube and Vimeo. The source list GA4's rules actually check files tiktok under social. With utm_medium=social the disagreement never comes up, because only the Organic Social rule can match. Tag the medium video and the tag matches both Organic Social and Organic Video, which is an ambiguity you don't need. Keep social.
One link, changed on purpose. A profile link serves every video you post, so it can't say which video sent the tap. Name utm_campaign after the offer, change it when the destination changes, and read spikes in GA4 against your posting dates.
Ads get their own tags. Keep this tag for the profile link and tag ad URLs with a paid medium in the TikTok ads UTM builder. The source stays tiktok on both, so filtering by source still shows every TikTok visit, and the channel column splits organic from paid.
Questions
Should a TikTok bio link use utm_medium=social or cpc?
social. cpc is a paid medium, and with tiktok as the source GA4 would put an unpaid profile tap in Paid Social. Save cpc or paid_social for ad URLs.
How many followers do I need to add a link to my TikTok profile?
1,000. The other route is a Verified Business Account. Once the account qualifies, the link goes in through Profile, Edit profile, then Add next to Links.
Can I add a link to a TikTok video?
TikTok documents product links for videos. With a TikTok Shop, in the countries where it's available (Indonesia, Malaysia, the Philippines, Singapore, Thailand, the UK, the US and Vietnam), you tap Add Link, then Products, when posting. After an extra review the link opens a Product Details Page in TikTok, so there's no URL of yours to tag.