AAC to Text
Free Online AAC Transcription
Drop your AAC audio file and get an accurate text transcript in seconds. Works with .aac and .m4a (AAC inside an MP4 container). No signup.
Drop your file here
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MP3 · MP4 · WAV · M4A · OGG · WEBM · FLAC · Max 25MB
Native AAC support
AAC is the default audio codec for Apple devices, YouTube, and most streaming services. Mictoo accepts .aac and .m4a directly without conversion.
High accuracy
AAC keeps high quality at small file sizes — perfect for AI transcription. Most clear recordings transcribe with 95%+ accuracy.
Edit and export
Review the transcript in the browser, fix names and punctuation, then download as plain .txt or .srt subtitles.
Frequently asked questions
What is an AAC file?
AAC (Advanced Audio Coding) is a lossy audio compression format used by iTunes, Apple Music, YouTube, and most podcast apps. Files have .aac or .m4a extensions. AAC offers better quality than MP3 at the same bitrate.
What is the difference between .aac and .m4a?
Both contain AAC-encoded audio. .aac is the raw audio stream; .m4a wraps it inside an MP4 container (which is how iTunes and iPhone Voice Memos save it). Mictoo supports both directly.
How do I convert AAC to text for free?
Drag your AAC file into the upload area above. Mictoo automatically transcribes it using AI and shows the text in seconds. Copy it to clipboard or download as a .txt file.
What is the maximum AAC file size?
Up to 25 MB per upload. AAC at 128 kbps gives about 25 minutes of audio per 25 MB; at 64 kbps you can fit nearly an hour. For longer files, lower the bitrate or split into segments.
Can I get timestamps for an AAC transcript?
Yes. After transcription you can download a .srt subtitle file with precise timestamps — useful for syncing the transcript back to the original audio or video.
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