File Submission

Two POST request formats can be used to submit a file: application/json or multipart/form-data.


This is the preferred method of file submission. It uses the source_config request parameter to provide a direct download URL to the Rev AI server.

This method supports the use of pre-signed URLs. Links to videos hosted on platforms like YouTube are not valid because they are not direct download links.

To submit a download URL with restricted access, authorization headers can be provided in the source_config parameter. More details on the source_config parameter can be found on the submission details page.


Signed URLs usually have an expiration time which is configurable. To ensure the Rev AI server can access the link, make sure the expiration time is set to 2 hours or more. In the event you plan on resending the same file, make sure to generate a new pre-signed URL.

Form data

This method can be used to send a local file to the Rev AI server directly from the host machine as a multipart/form-data request.


The following default limits apply per user, per endpoint for the Asynchronous Speech-to-Text API:

  • 10,000 transcription requests submitted every 10 minutes.
  • 500 transcriptions processed every 10 minutes. Any submissions over this will be accepted but put into a queue and not started until the next interval.
  • Maximum audio duration of 17 hours.
  • File uploads submitted as multipart/form-data requests to the /jobs endpoint have a concurrency limit of 5 and a file size limit of 2 GB per request.
  • File uploads via the Rev AI dashboard or using the source_config job parameter have a file size limit of 5 TB.