Audio and video transcription to power your apps. Exceptional accuracy and speed at scale in 99 languages. Powered by proprietary Whisper-Zero ASR, optimized for real-life enterprise audio.


Unparalleled quality

Gladia API provides highly accurate transcription without compromising speed (1h audio < 60s) while remaining one of the most affordable solutions on the market. Powered by Whisper-Zero, which removes virtually all hallucinations from audio transcripts.

Truly multilingual

Unlike any other provider on the market, our API supports 99 languages for asynchronous and live transcription, translation, as well as all of the current and upcoming audio intelligence features.

100% security

We take our client’s privacy very seriously. Our data hosting is fully compliant with all EU and US regulations. All data sent to or from our infrastructure is encrypted, with zero data retention available on demand.

Easy integration

Our plug-and-play API is compatible with all existing tech stacks and does not require any AI expertise to integrate. Optimized for scalability, our enterprise-grade API is complemented by an intuitive web app.


One API for speech-to-text, speaker diarization, word-level timestamps, code-switching, and translation. 95% accurate, easy to run and scale.

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Gladia API utilizes automatic speech recognition (ASR) technology to convert audio, video files, or URL to text format. It transcribes 1h of audio in less than 60s.

Automatic language detection
SRT and VTT caption formats
Noise reduction
Custom vocabulary
Automatic punctuation & casing
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Speaker diarization

Organize your transcripts in segments corresponding to different speakers. Diarization uses various advanced techniques to differentiate between different speakers based on their individual voice characteristics. Unlimited speakers.
Mono, stereo, and multi-channel files are all supported.

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Word-level timestamps

High-precision feature that assigns a specific timestamp to each recognized word in the transcribed text output of an ASR system. These timestamps are usually expressed in seconds.

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Our differentiating capability, allowing users to accurately transcribe an audio recording where multiple languages are spoken interchangeably, be it all throughout the conversation or just at the start.

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Use our translation to convert spoken language into written text using automatic speech recognition technology and language modeling. We support translation to and from 99 languages. Full list here.

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Word-level timestamp translation, or dubbing, refers to synchronizing translated subtitles or captions with the corresponding audio or video content. It involves generating timestamps for individual words or phrases in the translated text to ensure precise alignment with the original speech.

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SRT and VTT are two popular caption formats supported by Gladia that are used for subtitles in multimedia applications. Both formats are optimized to provide synchronized and readable subtitles that enhance the viewing experience.

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Perfect for developers, early-stage startups, and individuals



(10h/month included)


Designed to grow with scaling digital companies



+ $0.144 / hour for live transcription


Custom plan tailored to the modern enterprise

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It's the first time we've been able to transcribe video with such accuracy and speed — including when the conversation is technical. Whatever the language or accent, the quality is always there.



Have more questions?

Contact our support team to get what you need.

What is an audio transcription API?
  • An audio transcription API is an API that uses algorithms to analyze audio data and transcribe it into text.
  • Audio transcription technology is sometimes referred to as Speech-to-text or STT. While both refer to technology that results in audio data transcribed into text data, Speech-to-Text is technically a branch of natural language processing (NLP) that converts spoken language into written text, and is powered by AI models.
How does Gladia’s Speech-to-Text API work?
  • Gladia’s audio transcription API - also called a Speech-to-Text API - allows developers and product owners to add transcription to their products by calling on a single API for every audio transcription need.
  • On top of core transcription in 99 languages, Gladia’s API also offers a layer of audio intelligence features, such as diarization, word-level timestamps, various output formats, etc. See the Product page for a full list of Gladia’s features.
What are the key features of Gladia’s audio transcription API?
  • Gladia’s audio transcription API offers a range of features that fall into two broad categories: core audio transcription features, and audio intelligence features.
  • Core transcription includes features such as asynchronous transcription, speaker diarization, word-level timestamps, automatic language detection, punctuation, and casing, while audio intelligence can include features such as emotion detection, summarization, content tagging or PII redaction.
  • You can find the full, up-to-date list of features on Gladia’s Product page. You will also be able to see information such as features in beta, and information on upcoming products.
What audio formats does Gladia support?

Gladia’s audio transcription API supports a wide range of audio formats and codecs. The full list is available here, but make sure to reach out to our team if you encounter any issues with your specific file format.

What languages does the speech-to-text API support?

Gladia’s Speech-to-Text API supports 99 languages: afrikaans, albanian, amharic, arabic, armenian, assamese, azerbaijani, bashkir, basque, belarusian, bengali, bosnian, breton, bulgarian, burmese, castilian, catalan, chinese, croatian, czech, danish, dutch, english, estonian, faroese, finnish, flemish, french, galician, georgian, german, greek, gujarati, haitian, haitian creole, hausa, hawaiian, hebrew, hindi, hungarian, icelandic, indonesian, italian, japanese, javanese, kannada, kazakh, khmer, korean, lao, latin, latvian, letzeburgesch, lingala, lithuanian, luxembourgish, macedonian, malagasy, malay, malayalam, maltese, maori, marathi, moldavian, moldovan, mongolian, myanmar, nepali, norwegian, nynorsk, occitan, panjabi, pashto, persian, polish, portuguese, punjabi, pushto, romanian, russian, sanskrit, serbian, shona, sindhi, sinhala, sinhalese, slovak, slovenian, somali, spanish, sundanese, swahili, swedish, tagalog, tajik, tamil, tatar, telugu, thai, tibetan, turkish, turkmen, ukrainian, urdu, uzbek, valencian, vietnamese, welsh, yiddish, yoru

How accurate is Gladia’s audio transcription software?
  • Gladia’s API aims to be the most accurate AI-powered transcription software on the market. As of today, we provide top-tier quality for an for a near error-free experience, while remaining one of the fastest solutions on the market.
  • We are in the process of building benchmarks for languages other than English, but in the meantime, you can reach out directly to our team for information on your languages of interest. Gladia’s audio transcription can also address multiple languages in the same audio file, so you should ask us about that use case if it is relevant to you!
What is the pricing structure for the audio transcription API?
  • We aim to make Gladia’s audio transcription API a perfect balance of quality and speed while still remaining one of the most affordable options on the market.
  • Gladia’s pricing offers three tiers: free access, Pay-as-you-Go, and Enterprise. You can find more information about our pricing on the Pricing page.
What industries or use cases can benefit from the API?

Any company that manages or produces audio or video data can benefit from Gladia’s Speech-to-Text technology. More specifically, we work with the following types of companies and use cases:

  1. Customer or sales audio communications: from sales outreach platforms to call center technology providers, we enable companies to augment their human workforce by eradicating manual data entry or triage, and to improve their performance with detailed analytics and insights.
  2. Audio, video, and media production: streaming platforms, screencast or podcast production software, media platforms and forums, and audio and video recording or sharing products all use audio and video transcription to create more value for their users. Audio transcription makes their content exponentially faster to catalog and search, and much easier to access.
  3. Meetings and workforce management: virtual meeting providers and collaboration platforms can use audio transcription to help their customers store and exploit vast amounts of meeting data, giving them access to a previously untapped source of internal knowledge.
  4. Other use cases: specialized industries such as medicine, law and finance find immense value in speech-to-text technology that is fine-tuned to their specific language.
Are there any usage limits or restrictions?

Gladia’s Speech-to-Text API was built for developers and product owners with flexibility and ease of implementation in mind. Our rate limitations on the number of calls per hour and the total hours of audio transcribed depend on the user tier and are all described on the Pricing page. If your team has high volume requirements, don’t hesitate to contact us to get a custom quote.

How can I get started with implementing Speech-to-Text in my product?

Gladia’s API is extremely easy to implement. Once you have created your account, you’ll be able to generate an API key and use it to make calls on Gladia’s audio transcription. You can find all the information you need to get started in our Developer’s documentation.

Is Gladia GDPR compliant?

As Gladia already operates in Europe with organizations that require airtight data privacy compliance, Gladia is able to offer GDPR-compliant audio transcription. We are also working on further data privacy and security certifications, so reach out to our team if you have specific requirements on this front.

Is Gladia secure?

At Gladia, we are used to working with organizations with highly sensitive data and extremely tight security requirements. By default, we deliver our audio transcription services in a cloud-hosted environment which can be customized to your geographical footprint, but we are able to deliver on-premises hosting, as well as air-gapped hosting, depending on your security requirements.

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