How Platforms Detect AI Content, and What to Do About Metadata

Now that AI labeling is part of the conversation, the next question writes itself: how do marketplaces, social platforms, and actual humans tell that an image or video came from a generator in the first place? Short answer, there are three different methods, and they're nowhere near equally reliable. Here's how AI content detection actually works in practice, and more importantly, what a seller should do about it so nothing backfires.

How platforms detect AI content: three methods

The first and most reliable method is a built-in signature from the model maker itself. Major AI labs tag their generations with the C2PA standard (Content Credentials, a provenance signature embedded in the file's metadata) and with an invisible watermark called SynthID baked directly into the pixels. This isn't guesswork, it's a technical fact: the file itself discloses what made it. I covered who's pushing this and why in the piece on AI content disclosure rules.

The second method is third-party detector tools that try to guess the origin just by looking at the image. Treat these with caution. They get it wrong in both directions, flagging a real photo as generated and letting a clean AI render pass as authentic. A detector score is a probability, not a verdict, and you shouldn't build a decision on it alone.

Then there's the plain human eye. Six fingers, text that melts halfway through a word, shadows that don't match the light source: a moderator or a shopper catches these without any tool at all. The cleaner your frame looks, the less likely anyone flags it as AI just by glancing at it.

What happens to your metadata on upload

Here's a detail a lot of people miss. Social platforms and marketplaces don't handle metadata the same way. Some preserve the provenance signature, some strip it out during compression, and some add their own AI label on top regardless of what you uploaded. A number of platforms already auto-tag uploads that carry a generator's signature. Which means your file can show up to a viewer already marked, even if you never touched that setting yourself.

Should you strip the metadata

This is the practical advice, and it runs against instinct. Don't rush to scrub metadata and watermarks just to hide that something was AI-made. First, SynthID isn't something you can casually remove, it's embedded in the image itself, not a tag sitting on top. Second, the trend is heading the other way: provenance signatures are on track to become standard practice and, if anything, a trust signal rather than a red flag. Third, passing off a generated image as a real photo in a context where that misleads a buyer is a trust problem, not a technical one, and it costs you more down the line than it saves.

I'll be honest, the rules here are moving fast and there's no single standard that every platform follows yet. So I won't pretend there's one clean rule that covers every case. The baseline that holds up regardless: don't mislead buyers, don't strip signatures out of habit, keep your frame clean.

For my own generations I stopped bothering with metadata cleanup a while back, and I don't hide where the image came from either. A clean frame does more work than any detector-dodging trick ever would. The models on Flami ship with official provenance signatures built in by default, so you're starting from a clean position instead of a gray one.

FAQ

Can you tell for certain that an image or video was made by AI?

Your best bet is the built-in signature from the model itself: the C2PA metadata tag and the SynthID watermark embedded in the pixels. Third-party detectors are much less reliable and miss in both directions, and the human eye only catches the obvious mistakes.

How accurate are AI content detectors?

Not accurate enough to treat as proof. They produce a probability score and get it wrong often, calling real photos AI-generated and the reverse. Don't rely on one as your only evidence.

Should I delete metadata to hide that I used AI?

No. SynthID's invisible watermark isn't something you can simply strip, it's part of the pixel data, and provenance tags are becoming standard practice that works in your favor over time. Passing a generated image off as a real photo damages buyer trust.

Do social platforms label AI content automatically?

Some already add an AI label on upload based on the signature baked into the file. So your content can arrive to viewers pre-tagged even if you did nothing to flag it. Rules differ by platform and keep changing fast.

Sources

1. Flami: why AI generators mess up hands, text, and logos](https://flami.pro/blog/pochemu-neyroseti-kalechat-ruki-tekst)