Voice, Speech & Audio Annotation

Consent-backed voice datasets & audio annotation, in 25+ languages.

Our signature capability: consent-backed voice datasets and audio annotation services across 25+ languages — multilingual speech collection, transcription, speech labeling and dubbing, built end to end from contributor onboarding and recording to metadata tagging and QA.

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HindiSpanishArabic+22
25+
Languages
100+
Voice specialists
4-stage
QA workflow
100%
Consent-backed
End to end

From a single voice dataset to a full audio annotation program

A usable voice dataset is more than recordings. We handle contributor sourcing and explicit-consent onboarding, recording management, then audio annotation services — transcription, speaker diarization, emotion and event labeling — with metadata tagging and four-stage QA on every file. The same pipeline supports ASR, TTS and voice-cloning data, and connects to our audio transcription services and data annotation services.

Build a voice dataset
HindiSpanishArabic+22
What we deliver

Voice datasets & audio annotation services for ASR, TTS and voice AI

Prompted, scripted and conversational speech across accents, dialects and conditions — every dataset built on explicit consent with a full audit trail.

Voice Data Collection

  • Prompted, read & conversational
  • Accents, dialects & age ranges
  • Clean, noisy & far-field capture
  • Explicit-consent onboarding

Transcription

  • Verbatim & clean transcription
  • Time-stamping & alignment
  • ASR training & evaluation sets
  • Domain & accent tuning
See transcription

Dubbing & Voice-over

  • Multilingual dubbing
  • Studio & remote voice-over
  • Lip-sync & timing
  • Localized delivery

Subtitling & Captioning

  • Subtitles & closed captions
  • Multi-language delivery
  • Style-guide compliant
  • QA-reviewed timing

Audio Annotation

  • Speaker diarization & ID
  • Emotion & prosody
  • Event & noise tagging
  • Phonetic & accent labels
See annotation

TTS & Voice Cloning Data

  • High-quality studio reads
  • Phonetically balanced scripts
  • Consent for synthetic voice
  • Metadata-tagged corpora
Why Graveiens

Why teams choose our voice data & audio annotation services

Compliance-first delivery and a pay-on-approval model that de-risks every engagement.

Consent by design

Explicit-consent onboarding, metadata tagging and an audit trail on every voice contribution.

Deep language coverage

25+ languages including strong Indic, Asian and European coverage.

End-to-end pipeline

Onboarding, recording management, metadata and QA under one roof.

Pay on approval

Invoiced only for approved deliverables.

FAQ

Questions, answered

What audio annotation services do you offer?
Speech transcription, speaker diarization and ID, emotion and prosody labeling, event and noise tagging, and phonetic/accent labels — delivered on consent-backed audio through a four-stage QA workflow.
Is your voice data collected with consent?
Yes. Explicit consent is core to our design. Contributors are onboarded with consent, and each recording is metadata-tagged with an audit trail suitable for compliance review.
Which languages do you support?
25+ languages including deep Indic coverage plus major Asian and European languages, across a range of accents and dialects.
Can you build a voice dataset for TTS and voice cloning?
Yes, with phonetically balanced scripts, studio-grade reads and explicit consent for synthetic-voice use, delivered as metadata-tagged corpora.
How do engagements start?
Typically with a small paid pilot — one language or dataset type — billed only on approved files.

Related services

Audio transcription services Localization services Data collection services Conversational AI

Build a consent-backed voice dataset

Send us a sample task. You only pay for deliverables you approve.

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