ElevenLabs explains how audio deepfake detection works and its limits

Key points

• Watermark detectors give a yes or no answer, but only for the provider that embedded the watermark.
• ElevenLabs' Audio Detector finds only ElevenLabs-generated watermarks, not those from other companies.
• Statistical speech classifiers return a confidence score and can cover audio from any provider, though accuracy varies.
• The free AI Speech Classifier analyzes only the first minute and is unreliable on Eleven v3 audio.

Why it matters for marketers: Content and fraud teams should treat watermark checks as one layer in a multi-tool stack, since no single detector covers all voice providers.