Watermark detected
A supported watermark is evidence of AI generation or editing. It does not establish whether the depicted event is true, or whether the entire file was generated.
SynthID Detector
Use SynthID Detector to check images, video and audio for invisible AI watermarks with Google’s official tool.
ImagesVideoAudioOfficial tool
Open SynthID Detector
Opens synthid.com in a new tab. Files are uploaded to Google.
What is SynthID Detector?
SynthID Detector checks media for a watermark embedded by participating AI systems. This invisible signal is part of the content, rather than a visible logo or a filename tag. Detection can indicate that content was generated or edited with a supported AI tool.
Google opened the portal to everyone globally in English on October 7, 2026. Supported watermarks include those from Google and partners such as OpenAI, NVIDIA and Kakao. Small.im provides this guide and an official link; detection happens on synthid.com.
How to use SynthID Detector
1
Open the official tool
Follow the link to Google’s AI content detector. Use the portal’s current access requirements.
2
Upload your media
Choose an image, video or audio file on the official site. Use the original file when available and check the accepted formats and size limits there.
3
Review the result
Read the SynthID watermark detector result and any highlighted regions or segments. Compare it with the source and context before sharing.
Understanding the results
No watermark detected
The file may come from a system without SynthID, or the signal may be too weak to detect. This result does not prove that content is human-made or authentic.
When to check
Before sharing
Use an AI image watermark checker when a striking social post needs more context. Check the original publisher as well.
Editorial review
Check submitted media for a provenance signal before publication. Keep source verification and editorial judgment in the review.
Creative assets
Review images, video or music supplied for a project. A watermark result can support a conversation with the creator about AI use.
Learning about AI media
Compare known examples with SynthID Detector to understand the difference between watermark evidence and visual guesses.
Frequently asked questions
Does SynthID Detector detect every AI file?
No. It checks supported SynthID watermarks. Media from generators that do not embed them can go undetected.
Can I check images, video and audio?
The public portal supports these three media types. Follow the official site for the current formats, file limits and availability.
Can I check AI-generated text here?
This page links to the media portal. SynthID Text is a separate watermarking technology; text detection is not offered on Small.im.
Does editing affect the watermark?
SynthID is designed to withstand common changes, including compression and some cropping. Heavy alteration can weaken detection, so use the original file where possible.
Where are my files processed?
Uploads and detection take place on Google’s website under its terms and privacy policy. Small.im does not receive or analyze your files on this page.
Can I use SynthID Detector inside Small.im?
Open the official portal using the button above. This page provides a guide, without a local detector, bulk scanning or an embedded upload form.