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Upload AAC audio files and get accurate transcripts in minutes. Perfect for high-quality compressed audio.
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Supports 20+ file formats including MP3, MP4, WAV
AAC is the compressed audio format used by Apple devices, YouTube and many streaming apps. Raw .aac files often come from screen recorders and phone voice apps. Upload a .aac file and Scriptivox turns the speech in it into an accurate transcript with timestamps and speaker labels, which you can edit and download as TXT, DOCX, PDF, CSV, SRT or VTT.
Raw .aac files come from some voice recorders, screen recorders and audio exported from video. Upload the file as it is.
Leave it on auto-detect or pick one of more than 100 languages. Turn on speaker recognition when more than one person talks.
Read the transcript with timestamps, correct any word in the editor, then download it as TXT, DOCX, PDF, CSV, SRT or VTT.
| Specification | Value |
|---|---|
| Container | ADTS / raw AAC |
| Developed by | MPEG / Fraunhofer IIS |
| Introduced | 1997 |
| Audio codecs | AAC-LC, HE-AAC |
| Compression | Lossy |
| Typical bitrate | 96–256 kbps |
| Max sample rate | 96 kHz |
| Max channels | 8 |
| Gapless playback | Partial |
| Metadata / tags | ID3v2 (limited in ADTS) |
| Approx. file size | 0.72–1.92 MB per minute |
| Licensing | Patent-licensed |
| Plays natively on | Native: Web browsers, Windows, macOS, iOS, Android, Smart TVs |
| Best for | streaming services, mobile playback, broadcast |
Advanced AI technology meets simple, intuitive design
Powered by next-generation AI designed for seamless speech understanding worldwide
Transcripts delivered in real time and large files processed in minutes, not hours.
Your data is protected with end-to-end encryption, privacy-first safeguards, and enterprise-grade security controls.
Supports uploads of up to 10 hours, designed for uninterrupted transcription of lengthy sessions.
Global coverage with accent recognition and dialect adaptation, ensuring inclusivity worldwide.
Almost. M4A is a container that usually holds AAC audio, while an .aac file is the raw AAC stream. Scriptivox reads both, so you don't need to convert one into the other.
At the bitrates phones and recorders use, AAC keeps speech clear. Accuracy depends far more on background noise and how close the speaker was to the microphone.
You can start free, with no card, and transcribe short files every day. Pro adds unlimited transcriptions and files up to 10 hours or 5 GB each.
Yes. Turn on speaker recognition and each part of the transcript is labelled with its speaker, so interviews and meetings read like a script.
More than 100, from English, Spanish and Hindi to Arabic, Japanese and Swahili. Leave the language on auto-detect, or choose it for the best result on short files.
Files are transcribed many times faster than they play, so most are ready in a few minutes. Long recordings take a little longer, and you can close the page while they run.
Join thousands of users who trust Scriptivox for their transcription needs