What does the Substack keep for the Substack audio post?
An audio post is made in the web version of the publication: Create and then Podcast. The file of the Substack audio post is the input of the engine, and the revision deck is written from it.
Substack
Substack audio post to flashcards for revision in English
Substack audio post to flashcards for revision in English: send the file and get the text with the timecodes. One file may be up to 30 minutes on the free plan, no minute limit on Pro.
3 files a day up to 30 minutes, free99+ languagesSpeaker separation and timestamps
In short
What the Substack stores is what the engine needs. The English speech becomes the revision deck in the sections Cards, Terms to define, Self-check questions; one file may be up to 30 minutes, and 3 files a day are free.
How to get the file and turn it into flashcards for revision
- 1
Record or upload the file
The audio is recorded or uploaded as an MP3, a WAV or an ACC file, and the processing of the file is waited for
- 2
Upload the file
The Substack audio post goes to the service through the upload widget; the speech is English, and the revision deck comes back into the chat.
- 3
Run the instruction of the revision deck
The instruction of the task asks for the revision deck and puts the answer about the Substack audio post into the sections Cards, Terms to define, Self-check questions; a claim that is not in the recording is not written.
- 4
Mark the language of the speech
The speech of the Substack audio post is English, one of the 99+ languages the engine reads, and the widget is left on English while the revision deck is written.
- 5
Check the file before the upload
The transcript of a post can be edited, and a transcript file of the author can be uploaded as a .txt, .srt or .vtt file
What comes back from the engine
- TXT
One segment per line, the way a person wrote it down. It is the format to paste into a ticket, a chat or a document.
- TXT, CSV
The start and the end time of every segment, and the speakers named separately when you ask for it.
- SRT, VTT
SRT and VTT with the time of every line, so the recording can carry its own subtitles.
- Markdown, DOCX
The transcript is edited through the API and exported as Markdown for a wiki, or as DOCX for a review.
What Substack keeps, and what it says about it
| What | What the platform says |
|---|---|
| Where the file is | An audio post is made in the web version of the publication: Create and then Podcast. |
| What the file is | The audio file is recorded in the app or uploaded, and the transcript is opened with the transcript icon when the file has been processed. |
| What can go wrong | A video post is recorded in the browser with the Recording Studio of Substack or uploaded with Select file. |
| What the platform says | The audio file of a post is an MP3, a WAV or an ACC file. |
| What the platform says | The transcript of a post can be edited, and a transcript file of the author can be uploaded as a .txt, .srt or .vtt file. |
| Length of one file | up to 30 minutes on the free plan, no minute limit on Pro |
| Free plan | $0: 3 files a day, up to 30 minutes per file, no card |
| Pro plan | $10 a month when you pay yearly ($120 a year), or $20 a month |
The case
What the recording does not give you
The file of the Substack audio post is what the Substack keeps. The audio file is recorded in the app or uploaded, and the transcript is opened with the transcript icon when the file has been processed. The engine reads the English speech, and the sections Cards, Terms to define, Self-check questions come out of it.
Tips
A name that was never said in the Substack audio post stays out of the revision deck.
Set the language of the Substack audio post before you send the file.
The file of the Substack audio post stays on your own disk.
The recommended maximum size of a video upload is 20 GB, with a H.264 codec and an AAC audio codec.
Questions about Substack audio post and flashcards for revision
What does the Substack say about the Substack audio post?
The recommended maximum size of a video upload is 20 GB, with a H.264 codec and an AAC audio codec. The engine reads the English speech of the Substack audio post and writes the revision deck from that text.
How is the revision deck built from the Substack audio post?
The engine reads the English speech and the instruction writes the revision deck in the sections Cards, Terms to define, Self-check questions; every line comes from the transcript of the Substack audio post.
Is there a limit to the length of the Substack audio post?
One file of the Substack audio post may be up to 30 minutes on the free plan; the free plan gives 3 files a day.
Is a link enough for the Substack audio post?
Bring the file of the Substack audio post to your own disk and upload it here; the engine returns the revision deck with the time of every line.
Related pages
The same task on substack audio to text meeting minutes ru
The same task on another recording, with the same steps and the same sections.
Lecture to flashcards for revisionThe page of the task: the instruction that is written for it and an example of the answer.
Transcribe audio to textWhat the service does with a file: the formats of the export, the limits and the plans.
Sources
- SSubstack help: how can I generate a transcript of an audio post (read 2026-10-25)support.substack.com · checked
- SSubstack help: guide to video posts on Substack (read 2026-10-25)support.substack.com · checked
- TTranscription service page (read 2026-10-25)transcrib.si · checked
- TPricing page (read 2026-10-25)transcrib.si · checked
Reading: 4 minutesUpdated 
Transcribsi editorial team
Drop a recording — the text arrives in a minute
Speakers by name, a time on every line, export to TXT, SRT, VTT, CSV and Markdown.
3 files a day up to 30 minutes, free99+ languagesSpeaker separation and timestamps