AAC is the codec streaming and broadcast delivery settled on, so it is what comes out of station archives, stream captures and a good many export dialogs. Upload the file and download cues timed to the speech. Anything over 500 MB continues at the upload page, to the 10-hour and 5 GB ceilings. No charge for the first transcript, at any length · the preview arrives without an account · 1,000 minutes cost $8.
How it works
No re-encoding first, and no cue typed against a stopwatch.
From an archive export, a capture or a bounce out of a DAW. Up to 500 MB here, with longer material going through the upload page.
Each one arrives with its own timestamp, typically a few minutes of waiting per broadcast hour. The preview needs no signup.
Or VTT for a web player. TXT, DOCX, JSON and Markdown come from the same job whenever the words are wanted as a document.
AAC specifics
AAC packs more into each bit than the older lossy formats, which is exactly why streaming platforms and broadcasters standardised on it. A speech recording at a normal delivery bitrate sits around one to two megabytes a minute, so even a full broadcast day of material stays far under the 5 GB ceiling and runs into the 10-hour per-file limit instead.
AAC audio turns up under more than one name. A raw stream is usually .aac, while the same codec inside an MPEG-4 container is normally .m4a — the file your phone writes. Either uploads the same way here; if yours ends in .m4a, M4A to SRT is the page written for it, and the AAC format page covers the codec itself.
Usually a video assembled around a segment, a caption track beside an on-demand player, or an editor timeline where broadcast audio meets picture. The generic page is audio to SRT; video to SRT covers a video file, YouTube to SRT a public link, and the caption generator everything else.
Where the file goes
A VTT track beside the player gives a radio segment readable words, which helps listeners and search engines alike.
Timed text makes it straightforward to point at exactly when something was said, down to the word.
Captions carry a promo through a silent feed, and the timings come from the broadcast audio rather than a guess.
The same job produces DOCX and TXT, giving an audio archive a searchable written companion.
Pricing
No charge for the first transcript, readable in full at any length. Then 1,000 minutes for $8, 2,000 for $12, 5,000 for $24, credits that keep.
| Recording | $8 pack | $12 pack | $24 pack |
|---|---|---|---|
| 8-minute segment | $0.06 | $0.05 | $0.04 |
| 1-hour programme | $0.48 | $0.36 | $0.29 |
| 3-hour broadcast | $1.44 | $1.08 | $0.86 |
| 6-hour archive block | $2.88 | $2.16 | $1.73 |
Each figure is the slice of a pack that length of audio consumes. See pricing.
FAQ
Upload the file on this page, read the preview without signing up, open the transcript in full with a free account, then download the SRT.
Both do. The .m4a extension means the same codec inside an MPEG-4 container, and it uploads identically.
No. SRT, VTT, TXT and DOCX exports hold the words and their timings. Speakers are identified and named in the summary, key quotes and chapters.
No. At delivery bitrates the speech is intact, and what really decides accuracy is the recording itself rather than the codec it was encoded with.
Up to 10 hours or 5 GB. Given how compact AAC is, runtime is the limit you meet in practice.
Yes, provided you have the file. Upload it like any other recording; the cues are timed from the audio itself.
One hour uses $0.48 of the $8 pack, $0.36 at the $12 rate, or $0.29 at the $24 rate, and credits do not expire.
Every page in this set uses the same upload box and the same export. All subtitle pages
Instant preview, no signup. No charge for the first transcript, at any length.
For the recordings you have now: see transcription services from $4, audio transcription services for interviews and calls and how to transcribe audio to text online.