S21 Deepfake Detector

Assess image and video authenticity when certainty matters.

S21 Deepfake Detector helps investigators assess whether images or individual video frames may be AI-generated, synthetic or manipulated. It analyses visual indicators, presents confidence-based results, and supports informed human judgement - fully offline for sensitive investigative environments.

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The Problem

When authenticity is unclear, investigation slows down.

Investigators increasingly encounter images and video where it is not immediately clear whether the material is real, AI-generated or manipulated. That uncertainty can slow down decisions, especially in cases involving safeguarding, sextortion, fraud, online harm or intelligence development.

Without structured indicators, teams are left relying on manual visual judgement alone, making it harder to assess credibility, prioritise next steps and understand the evidential value of uncertain media.

See how it works in 5 minutes

Join a former law enforcement officer for a practical walkthrough of the tool and features designed to support real-world investigations

Fully Offline & Secure

All analysis runs locally. Sensitive imagery and video never leave your environment.

Designed for investigative reality

Built for safeguarding teams, DFUs, and intelligence analysts — not social media moderation.

No specialist infrastructure required

Runs on existing workstations without servers, cloud services, or complex deployment.

We’re creating an open community of collaboration with other industry experts

S21 VisionX fully supports evidential data exchange with leading digital forensic tools, ensuring seamless integration with your existing workflow. Compatible platforms include X-Ways Forensics, Cellebrite, Magnet Forensics (AXIOM, IEF, Witness), GrayShift, Griffeye, Belkasoft X, Oxygen Forensics, OpenText EnCase, MSAB XRY and XAMN, Exterro, GetData, and many others. With S21 VisionX, you can review, categorise and identify victims efficiently — and easily export results back to your tool of choice for further analysis or reporting.

The Solution

What S21 Deepfake Detector helps investigators do

Assess still images and video frames

Analyse images or selected video frames where authenticity is uncertain.

Identify manipulation indicators

Surface visual artefacts, inconsistencies and patterns associated with synthetic or manipulated media.

Understand confidence clearly

Present confidence-based results, including where the assessment is uncertain or indeterminate.

Support human judgement

Give investigators structured information to assess authenticity without replacing professional review.

Review manipulation indicators faster.

S21 Deepfake Detector gives investigators a structured way to examine uncertain images and selected video frames inside their own environment. Instead of relying on manual visual checks, third-party upload tools or lengthy review, teams can assess indicators associated with synthetic generation or manipulation and receive confidence-based results that support further investigative judgement.

The tool is designed to highlight areas of concern, surface uncertainty clearly and help investigators decide whether material needs further review, escalation or contextual assessment. It does not make final determinations on authenticity - it gives teams clearer information, faster, while keeping sensitive media under investigator control.

How it works

From suspicious media to structured assessment

S21 AutomateX supports teams through the preparation and processing stages of large-scale digital investigations, helping them automate repeatable X-Ways and VisionX workflows, reduce manual handoff, and move evidence into structured review faster.

Without automation, investigators are forced to spend critical time managing process instead of assessing material.

Add the image or frame

Investigators start with a still image or selected video frame where authenticity is in question.

Run local analysis

S21 Deepfake Detector assesses the material using forensic indicators associated with synthetic generation or manipulation.

Review the confidence result

The tool presents results in a clear format, including where confidence is low or uncertainty remains.

Use the assessment in context

Investigators use the result to support safeguarding, intelligence, evidential review or further enquiry.

"The Semantics 21 team clearly put the customer first. It's refreshing to feel that we have a company prepared to listen to our individual needs and create solutions which are fit for purpose."

D/Insp Milligan
Merseyside Police, UK

Features

Authenticity assessment features for investigative review

Media assessment

Still image assessment
Individual video frame assessment
Synthetic media indicators
Manipulation indicators

Indicator analysis

Visual artefacts
Geometric inconsistencies
Biological plausibility indicators
Micro-textural and statistical signals

Investigator review

Confidence-based outputs
Low-confidence or indeterminate handling
Clear presentation of results
Support for human judgement

Secure operation

Fully offline analysis
Local processing
No cloud upload required
Suitable for sensitive investigative material

Offline & Secure

Assess sensitive media without cloud upload.

S21 Deepfake Detector runs locally, allowing investigators to assess sensitive imagery and video frames without relying on cloud services or external tools. This supports controlled review in safeguarding, forensic and intelligence environments.

Who it's for

Built for teams handling uncertain media

S21 Deepfake Detector is built for teams that need to assess whether images or video frames are real, synthetic or manipulated.

Safeguarding teams

Assess whether imagery may be synthetic, manipulated or unreliable where safeguarding relevance is unclear.

Digital forensic units

Support structured review of seized media, extracted images or video frames.

Intelligence analysts

Add a consistent authenticity assessment layer when media is being used to inform intelligence decisions.

Operational Capability

Built to assess authenticity, uncertainty and risk

S21 Deepfake Detector supports structured assessment of images and selected video frames where authenticity is unclear. It helps investigators review indicators of synthetic generation or manipulation, understand confidence levels, and keep uncertain media under controlled human assessment.

Image and frame assessment

Assess still images and selected video frames where authenticity is uncertain.

Synthetic media indicators

Surface signs associated with AI-generated, synthetic or manipulated imagery.

Confidence-based results

Present clear results, including where confidence is low or the assessment is indeterminate.

Investigator-led review

Support professional judgement without making automated investigative decisions.

S21 Deepfake detector + S21 VisionX

S21 VisionX, where structured assessment operates at investigative scale

Authenticity assessment is only one part of large-scale investigative review. Investigations involve thousands of files where authenticity may be uncertain.

S21 Deepfake Detector

When authenticity is uncertain, move from suspicion to informed assessment, without relying on external tools or guesswork.

S21 VisionX

The offline investigative platform these tools were built inside.

S21 Deepfake Detector was developed and proven inside S21 VisionX and is now available as a standalone tool due to investigator demand.

Explore S21 VisionX

Used in investigations where delays and missed connections have consequences.

Designed for secure environments. Built for large-scale investigations. Developed with investigators and forensic practitioners.

Operational impact across real investigations

See how investigative teams are using Deepfake Detector to analyse evidence, identify connections and progress complex cases.

View all case studies

S21 Deepfake Detector​

Assess image and video authenticity when certainty matters.

The Problem

When authenticity is unclear, investigation slows down.

See how it works in 5 minutes

Join a former law enforcement officer for a practical walkthrough of the tool and features designed to support real-world investigations

Fully Offline & Secure

Designed for investigative reality

No specialist infrastructure required

We’re creating an open community of collaboration with other industry experts​

The Solution

What S21 Deepfake Detector helps investigators do

Assess still images and video frames

Identify manipulation indicators

Understand confidence clearly

Support human judgement

Review manipulation indicators faster.

From suspicious media to structured assessment

Add the image or frame

Run local analysis

Review the confidence result

Use the assessment in context

"The Semantics 21 team clearly put the customer first. It's refreshing to feel that we have a company prepared to listen to our individual needs and create solutions which are fit for purpose."

Authenticity assessment features for investigative review

Media assessment

Indicator analysis

Investigator review

Secure operation

Offline & Secure

Assess sensitive media without cloud upload.

Who it's for

Built for teams handling uncertain media

Safeguarding teams

Digital forensic units

Intelligence analysts

Operational Capability

Built to assess authenticity, uncertainty and risk

Image and frame assessment

Synthetic media indicators

Confidence-based results

Investigator-led review

S21 Deepfake detector + S21 VisionX

S21 VisionX, where structured assessment operates at investigative scale

S21 Deepfake Detector

S21 VisionX

Used in investigations where delays and missed connections have consequences.

Operational impact across real investigations

Compare how authenticity is currently assessed

S21 Deepfake Detector

We’re creating an open community of collaboration with other industry experts