If you post AI-assisted video, the question is no longer whether to disclose it but how, because each platform now answers that differently. YouTube hides the control in the upload flow, TikTok wants a toggle or an on-screen mark, and Meta leans on automatic detection. Get the mechanics wrong on one platform and you risk a label you cannot remove, reduced reach, or a monetization strike. This guide maps the rule for each, side by side, and pairs with our hub on AI content compliance in 2026.
Why the rules tightened in 2026
The common driver is the EU AI Act. Article 50 requires that AI-generated or manipulated media be marked in a machine-readable way and, where it could mislead, disclosed. The headline date is 2 August 2026, though a May 2026 grace period gives systems already on the market until 2 December to meet the marking requirement. The reach is what matters for creators outside Europe: the rule targets platforms serving EU users, so global platforms apply it everywhere rather than running a separate EU version. Penalties scale to roughly 3% of global turnover, which is why every major platform tightened its uploader rules in the same window.
Detection got better at the same time. Google's SynthID watermark is now carried by OpenAI, ElevenLabs, and others, and TikTok has read C2PA Content Credentials since early 2025. So the platforms are no longer guessing. That changes the smart move from "hope it slips through" to "disclose before they detect."
YouTube: a checkbox in the upload flow
YouTube puts disclosure in an "altered content" step during upload. It asks whether your video makes a real person appear to say or do something they did not, alters footage of a real event, or shows a realistic scene that did not occur. An AI voiceover, a deepfake, or a synthetic-but-realistic scene means you select Yes. Using AI only for ideas, a script, or captions does not trigger it.
Two things make YouTube stricter than it looks. First, its detection can apply a synthetic-content label itself, and you cannot remove that one. Second, repeated failure to disclose risks suspension from the Partner Program, which pulls ad revenue from the whole channel, not one video. Separately, the "inauthentic content" policy demonetizes mass-produced or template-driven uploads regardless of AI; a January 2026 wave wiped 16 channels with 35 million combined subscribers. We break the platform down further in the new YouTube algorithm and AI rules and, for voice specifically, in how to disclose AI voice without losing monetization.
TikTok: a toggle, or mark it yourself
TikTok asks for a visible label whenever AI generates or significantly alters a realistic depiction of a person, place, or event. You have two ways to comply. Flip the "AI-generated content" toggle when you publish, and TikTok shows a "Disclosed by creator as AI-generated" label in the corner. Or mark it yourself with on-screen text, a watermark, a sticker, or a line in the description. As elsewhere, AI used only for scripts or captions is exempt.
TikTok is the furthest ahead on automatic detection. It began reading C2PA Content Credentials in January 2025, the first major platform to do so, and has since auto-labeled more than 1.3 billion videos using credentials, invisible watermarks, and detection models. If the system catches undisclosed AI, it may label the video for you, throttle its reach, or remove it. Content that follows the rules stays eligible to earn.
Instagram and Facebook: detection first
Meta runs the most automated approach across Instagram and Facebook. It detects AI images and video by reading metadata, a C2PA manifest or, for its own tools, the IPTC Digital Source Type field in the file, then applies an "AI info" label. There are two flavors: the per-post "AI info" tag, and an account-level "AI Creator" label for accounts that regularly post AI content. You can also apply labels manually.
The teeth are on the advertising side. For organic posts the labeling is largely automatic and light-touch, but advertisers are required to use a disclosure control in Meta Ads Manager whenever creative is AI-generated or manipulated. If you run paid social, that control is not optional.
The rules side by side
| What forces a label | How you disclose | Auto-detection | Main risk | |
|---|---|---|---|---|
| YouTube | AI voice, deepfake, realistic synthetic scene | "Altered content" = Yes at upload | Yes — can auto-label, unremovable | Partner Program suspension |
| TikTok | AI generating/altering realistic people, places, events | Toggle, or on-screen mark | Yes — C2PA since 2025, 1.3B+ labeled | Reduced reach or removal |
| Meta (IG/FB) | AI images/video (detected via metadata) | Mostly automatic; manual option; required for ads | Yes — reads C2PA / IPTC metadata | Ad disclosure is mandatory |
The pattern: the trigger is always "realistic and could mislead," the exemption is always "AI for ideas or scripts," and every platform now detects rather than trusts.
What holds true everywhere
Three rules survive the platform differences. Disclose before they detect, because a label you set reads as transparency while one the platform adds reads as something it caught. AI used for productivity, brainstorming a script, generating captions, does not need a label on any of these platforms. And a missing watermark is not a safe harbor: provenance signals like SynthID and C2PA are spreading fast, detection runs additional signals, and an undisclosed upload that gets caught is still a failure to disclose. To see which tools leave a detectable mark, check our SynthID tool matrix.
Quick checklist before you post
- Realistic AI of a person, place, or event? Plan to disclose on every platform.
- YouTube: set "Altered content" to Yes for AI voice or synthetic scenes.
- TikTok: flip the AI toggle, or add a visible on-screen mark.
- Meta: let detection label organic posts, but use the Ads Manager control on any paid creative.
- Running AI for scripts or captions only? No label needed anywhere.
Bottom line
The disclosure rule is the same idea on every platform, transparency about realistic synthetic media, but the button is in a different place each time. Learn the three controls, disclose by default, and treat the AI-for-ideas exemption as the one consistent line you do not need to cross. For the full legal and provenance picture behind all of this, start with the AI content compliance hub.
