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    Google SynthID guide

    Google SynthID Detector.
    Not a truth detector.

    My roller-skating video was completely AI. Google didn’t detect its watermark. Here’s how to try the tool—and why that result doesn’t mean the video is real.

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    Watch the Short

    AI me. ’80s roller skates. No flag.

    In my test, content I made with Google tools was flagged each time. An AI skating clip from a tool I couldn’t identify wasn’t. The important part of the result was “SynthID was not detected”—with a note that it may have been generated by a non-partner.

    These are the examples in my video, not a controlled benchmark or a guarantee about every Google-generated file.

    Watermark ≠ truthAbout 52 seconds
    Watch on YouTube

    Why this matters

    A missing watermark is not a clean bill of health.

    SynthID looks for a hidden signal placed in content by supported AI tools. It doesn’t decide whether an event happened, whether a person said something, or whether every AI system could have made the clip.

    The wrong conclusion

    “No flag. Must be real.”

    That skips all the AI tools outside the watermark system—and everything the detector cannot establish.

    The useful conclusion

    “No SynthID found. Still unverified.”

    A detected watermark is a useful clue about origin. No watermark leaves the real-or-AI question open.

    Easiest path

    Keep a checklist, not a verdict.

    1. 1.Download the watermark-checking checklist.
    2. 2.Attach it to Claude if you want help organizing your evidence.
    3. 3.Run the actual watermark check with Google's tool; an assistant's visual guess is not a SynthID result.
    Download the checklist

    Try it yourself

    Check the file. Then check the source.

    Step 01

    Start with Google's official tools

    Open synthid.com, Google's official SynthID Detector, and sign in using an option shown there. Google opened it globally in English on October 7, 2026, for image, video, and audio checks. Gemini also has supported watermark-verification features; follow each tool's current upload guidance.

    Open SynthID Detector Open Gemini

    Step 02

    Upload a file you have permission to share

    Use the original image or video when possible, rather than a screenshot or heavily edited repost. Check the tool's current upload limits and privacy terms first. Do not upload private or sensitive footage just to try a detector.

    For supported verification in Gemini

    Check this file for a SynthID watermark. Report the watermark result separately from any visual guesses. If no watermark is detected, explain why that does not establish whether the content is real or AI-generated.

    If Gemini cannot perform a watermark check for your file, a description of what it looks like is not a substitute.

    Step 03

    Read the watermark result—not a real-or-fake verdict

    Look for whether SynthID was detected. A positive result is evidence of a SynthID watermark in the checked content. A negative result means the watermark was not found; AI from another tool can still go undetected.

    Step 04

    Check the source before you share

    Find the original uploader, look for a generation disclosure, and check independent sources for the event shown. Keep the exact detector wording with your notes. Do not turn ‘not detected’ into ‘confirmed real.’

    Before sharing

    Use it as one clue.

    1. 1.Save the exact result and note which version of the file you checked.
    2. 2.Look for the original post and any creator disclosure.
    3. 3.For important claims, compare independent reporting or original records.
    4. 4.If you cannot verify it, say so. Don’t call it real just because it passed without a flag.

    What the check can tell you

    Know the boundaries.

    • A SynthID result for the file the tool actually checked
    • A provenance clue for supported watermarked content
    • Not universal coverage of all AI-generation tools
    • Not proof that a scene or claim is genuine
    • Not a guarantee that an edited copy keeps a detectable signal
    • Not permission to accuse someone based on a single result

    Official references: Google DeepMind’s SynthID overview and Google’s public-launch announcement. You can also check supported files in Gemini. Follow the current guidance shown there if the upload options change.

    SynthID questions, answered.

    I try it. You see what happened.

    Real tests of the AI tools showing up in everyday life—including the limits that matter.

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