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Upload M4A audio and get accurately timed SRT subtitles in minutes, ready for YouTube, social video and your editor.
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Supports 20+ file formats including MP3, MP4, WAV
M4A is the AAC audio format Apple uses. iPhone Voice Memos, GarageBand exports and Zoom's audio-only recordings are all M4A files. Upload a .m4a file and Scriptivox turns the speech in it into timed SRT subtitles, the format YouTube, Vimeo, VLC, Premiere Pro and DaVinci Resolve all accept.
On an iPhone, open the memo in Voice Memos, tap Share and save it to Files, or AirDrop it to your Mac. Zoom puts an audio_only.m4a file in the folder of each local recording.
Leave it on auto-detect or pick one of more than 100 languages. Turn on speaker recognition when more than one person talks.
Read every line in the editor, fix any word, then download the .srt file, ready for YouTube, your video editor or your player.
| Specification | Value |
|---|---|
| Container | MPEG-4 Part 14 |
| Developed by | Apple / MPEG |
| Introduced | 2003 |
| Audio codecs | AAC-LC, HE-AAC, ALAC |
| Compression | Depends on codec |
| Typical bitrate | 96–256 kbps |
| Max sample rate | 96 kHz |
| Max channels | 8 |
| Gapless playback | Yes |
| Metadata / tags | MPEG-4 iTunes-style atoms |
| 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 | the Apple ecosystem, music libraries, audiobooks |
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.
Yes. Voice Memos are saved as .m4a files. Share the memo to Files or AirDrop it to your computer, then upload it here.
Yes, up to your plan's maximum file length. The transcript keeps timestamps all the way through, so you can jump to any part of a long memo.
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. The editor shows every line with its timing. Correct names and terms, then download the finished file.
SRT works almost everywhere: YouTube, Vimeo, Facebook, LinkedIn, VLC, Premiere Pro, Final Cut Pro and DaVinci Resolve all accept .srt files.
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