DigitalGuider explains how marketers can use Google’s SynthID detector

DigitalGuider has published a guide for marketing teams on Google’s public SynthID Detector, which can identify watermarks in AI-made images, video and audio. The agency says the tool can add useful context, but brands still need source checks and human review before publishing.

Why it matters: - Marketing teams are publishing more AI-assisted images, video and audio, which makes file provenance harder to verify. - Google’s public SynthID Detector gives brands a new way to check whether a file includes a SynthID watermark before it goes live. - The tool can help teams reduce risk when working with stock assets, freelancers, vendors and partner brands.

What happened: - DigitalGuider released a guide explaining how Google SynthID watermark detection works for digital marketers, content teams and social media managers. - Google opened SynthID Detector to the public on Oct. 7, 2026. - The detector is available worldwide in English. - Pushmeet Kohli, VP of Science and Strategic Initiatives at Google DeepMind, announced the expansion in a Google blog post.

The details: - Users can upload an image, video or audio file to check whether it carries a SynthID watermark. - SynthID watermarks are imperceptible markers added to media made with AI tools from Google and its partners. - Google says the detector can find watermarks from Google and partners including OpenAI, NVIDIA and Kakao. - Google says Apple is listed as a partner to be added soon. - Google reports that it has watermarked more than 180 billion images and videos, plus 240,000 years of audio content. - The process requires a user to visit SynthID, sign in and upload a file. - The detector then scans the file and returns a result. - A result showing SynthID was detected means the media was made or edited with AI from Google or one of its partners. - Google recommends using the highest-quality copy of a file for the most reliable result. - DigitalGuider says marketing teams should ask for the original version instead of a compressed copy when files come from designers, freelancers or vendors. - A detected watermark shows that Google or partner AI played a part, but it does not show how much AI was used. - A lightly edited photo and an image made from scratch can produce the same result. - A file may also have been changed after the watermark was added. - A missing watermark has limits too. - Google says the detector is not a general AI detector. - The tool only finds media from companies that use SynthID. - Google’s FAQ says no signal is completely robust and advises gathering several pieces of information before drawing a conclusion.

Between the lines: - The release reflects a broader shift in marketing workflows, where verification is becoming part of content production rather than an afterthought. - SynthID can add useful context, but the result is not a full authenticity check on its own. - For brands, the practical value is less about proving authorship and more about reducing uncertainty before publishing. - DigitalGuider’s message is that source verification, written usage agreements and human review still matter even when a watermark is present or absent.

What's next: - DigitalGuider recommends running a SynthID check on every image, video or audio file that comes from outside the team before publishing. - The agency says businesses should pair file checks with source verification and human review as part of their digital marketing strategy. - Marketing teams are likely to use watermark detection alongside SEO and content workflows as AI-generated media becomes more common. - More information about DigitalGuider and its SEO and digital marketing services is available at the company’s website.

The bottom line: - SynthID detection can flag AI involvement, but it cannot confirm the full story behind a file, so marketers still need layered checks before they publish.