Transcription, either by speaking into a microphone or uploading an audio file, is available for users of Office 365 through Word online. A personal account is about $7 a month or $70 a year.
Microphone transcription is unlimited but transcriptions from an audio file are limited to 5 hours a month.
After doing a lot of testing with this, it works pretty well. You wind up with two pieces of content, written and audio, for different needs of your audience.
The "free" part comes into play when you compare the service to a human transcription service which may charge $1 or more per minute. Human type is higher quality, but the automated type + a little editing is a good way to get started.
Added later:
I haven't tested it but the first 45 minutes of automated transcription is free here: Automated Transcription Checkout | Add Files - Rev
Microphone transcription is unlimited but transcriptions from an audio file are limited to 5 hours a month.
After doing a lot of testing with this, it works pretty well. You wind up with two pieces of content, written and audio, for different needs of your audience.
The "free" part comes into play when you compare the service to a human transcription service which may charge $1 or more per minute. Human type is higher quality, but the automated type + a little editing is a good way to get started.
Added later:
I haven't tested it but the first 45 minutes of automated transcription is free here: Automated Transcription Checkout | Add Files - Rev