SOP: Verify a Video with SynthID Fresh

Date: February 2026 | Estimated Time: 5-10 minutes

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Purpose

Verify whether a video was created or edited by a Google AI model by checking for embedded SynthID watermarks using the Gemini App.

Prerequisites Checklist

• [ ] Personal Google account or Google Workspace account
• [ ] Latest Gemini App (web or mobile)
• [ ] Signed in to your Google account
• [ ] Video file under 100 MB
• [ ] Video duration under 90 seconds
• [ ] Daily quota not exceeded (10 video checks / 5 min total per day)

Process Flowchart

Procedure

Step 1: Prepare the Video File

Before uploading, verify:

1. File size is under 100 MB — if larger, compress using a video editor or tool like HandBrake
2. Duration is under 90 seconds — if longer, trim to the relevant section you want to verify
3. Format is supported (MP4 and other common video formats)

Video-Specific Limits

Videos are limited to 90 seconds maximum and 100 MB maximum. Your daily quota allows 10 video checks totaling no more than 5 minutes of combined video time.

Step 2: Open the Gemini App

1. Navigate to gemini.google.com on your computer, or open the Gemini app on mobile
2. Ensure you are signed in to your Google account

Step 3: Upload the Video

1. Click or tap the Add files button
2. Select Upload from device (or Google Drive)
3. Choose the video file
4. Wait for the upload and processing to complete — this may take longer than images due to file size

Step 4: Ask the Verification Question

Type a verification prompt:

• Was this video created by AI?
• Check this video for SynthID watermarks
• @synthid verify this video

Press Enter or tap Send.

Step 5: Interpret the Results

Result	Meaning	Next Steps
SynthID watermark detected	Full video was created/edited by Google AI	Verification complete
Partial watermark detection	Portions of the video contain SynthID watermarks	Some sections are AI-generated, others may not be
No SynthID watermark detected	Not created by Google AI	May be other AI or authentic video
Unclear	Cannot determine	Use alternative methods

Partial Detection

SynthID can detect watermarks in portions of a video. If only parts were AI-generated or AI-edited, the verification may return partial detection results, indicating which segments contain watermarks.

Step 6: If Results Are Unclear

1. Frame-by-frame inspection — Look for visual artifacts in individual frames
2. Audio track analysis — Check the audio separately if the video includes AI-generated audio
3. Metadata check — Inspect video file metadata for camera data or editing software traces
4. Reverse search — Extract key frames and perform reverse image searches

Best Practices

• Upload the original file — avoid re-encoding or compressing before verification
• Trim to the relevant section if the video is longer than 90 seconds
• Check audio separately if you suspect only the audio portion is AI-generated
• Monitor your daily quota — 10 checks or 5 minutes total, whichever comes first

Verification Checklist

• [ ] Video is under 100 MB
• [ ] Video duration is under 90 seconds
• [ ] Video is in a supported format (MP4, etc.)
• [ ] Uploaded to Gemini App successfully
• [ ] Verification question asked
• [ ] Result reviewed (full, partial, no watermark, or unclear)
• [ ] If partial: noted which segments are AI-generated
• [ ] If unclear: alternative detection methods applied
• [ ] Findings documented