Try Live STT Models

Test AssemblyAI Universal (us) Live

Upload your own audio file (not huge for now) and get an instant transcript from AssemblyAI Universal (us). No login required.

Try AssemblyAI Universal (us) on your audio

Drop a file below. We have pre-selected AssemblyAI Universal (us) for you.

Input Source

Click or drag audio file here

Supports MP3, M4A, WAV, OGG

Up to 30 minutes of audio; longer recordings accepted up to 4 hours.

Configuration

Input Language

Processing Options

Normalize AudioAuto-convert to 16kHz WAV mono for best results

Advanced Options

Use Native Configuration Mode

Enables raw parameter access for AssemblyAI Universal (us). Disables universal options.

Speaker DiarizationNot supported by all selected

Identifies different speakers in the audio and labels their speech.

Speaker Count HintNot supported by all selected

Min Speakers

Max Speakers

Provides a hint for the minimum and maximum number of expected speakers to improve diarization accuracy.

Custom VocabularyNot supported by all selected

Boosts the recognition probability of specific words or phrases, such as proper nouns or domain-specific terms. Provide one phrase per line.

Filter ProfanityNot supported by all selected

Detects and masks profane words in the transcript.

Smart FormattingNot supported by all selected

Converts transcribed numbers, dates, and currency into a more readable format (e.g., "twenty dollars" becomes "$20").

Automatic PunctuationNot supported by all selected

Automatically inserts punctuation like periods, commas, and question marks into the transcript.

Note: Files and transcripts are not stored on our servers and are used only to complete your request. More features are coming.

Technical Specifications

Configurable Parameters

These universal options are mapped to provider-specific features.

languagestring

Language

Primary language of the audio

Capabilities

Native Configuration

These are the provider's native API parameters — shown exactly as exposed by the vendor.

boost_paramDefault: default

How much to boost the keywords. low, default, or high.

speech_threshold

Threshold for speech detection (0.0 to 1.0).

dual_channel

Enable dual channel transcription.

disfluencies

Include filler words like 'um' and 'uh'.

redact_pii

Redact personally identifiable information from the transcript.

redact_pii_audio

Redact personally identifiable information from the audio file.

content_safety

Enable content safety detection.

About AssemblyAI Universal (us)

AssemblyAI Universal model with diarization, entity detection, sentiment analysis, and audio intelligence options

Pricing

A detailed pricing breakdown will be available here shortly. For now, please refer to the provider's official website.

View AssemblyAI Universal (us) official documentation