WAV в M4A
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Экспорт в M4A зависит от MediaRecorder и поддержки кодеков в вашем браузере.
Tool guide
An uncompressed WAV costs roughly 10 MB per stereo minute, which is awkward to keep in a phone library or send over a messenger. This page repacks the track into an M4A container with AAC audio — the format Apple Music, Notes and stock phone players accept without argument. Everything runs on your device through the browser's MediaRecorder, so whether it succeeds depends on your browser's AAC support. See also: turn the finished M4A back into MP3, a raw AAC stream with no container, keep the original with no quality loss.
Export uses MediaRecorder, and the browser decides which output types it offers. Safari on macOS and iOS usually writes mp4/AAC, while desktop Chrome and Firefox often only offer WebM/Opus. Rather than mislabel a file, the page says so. Retry in Safari, or take the WAV to MP3 route.
MediaRecorder encodes the stream as it plays, in real time, so an hour of audio takes about an hour. Browsers do not expose a faster offline AAC encoder. Keep the tab in the foreground — a backgrounded tab can throttle playback and truncate the result.
AAC is lossy, so some spectral detail is gone for good. On speech and podcasts the difference is hard to hear; on dense mixes and cymbals it is more obvious. Keep the WAV as your master for editing and treat the M4A as a delivery copy.
No. The page exposes only file selection, convert and reset; the bitrate is whatever MediaRecorder picks, typically around 128 kbps. For a specific bitrate use a desktop encoder and keep this tool for quick everyday conversions.
A plain AAC-in-M4A file is the native format for Apple's ecosystem, so the library accepts it. Voice Memos does not import files directly, but you can drop the m4a into Files or iCloud Drive and play it with the stock player.
The source never leaves the tab: the page reads it through the File API, plays it locally and assembles the output in memory. Only the HTML and script come from the server. Close the tab and no temporary copy or log entry remains.
Before: rehearsal.wav — 106 MB, 16-bit PCM, 44.1 kHz, stereo, 10:00
After: rehearsal.m4a — about 9 MB, AAC, same length and sample rate
Before: comment.wav — 12 MB, 16-bit PCM, 44.1 kHz, mono, 2:15
After: comment.m4a — about 1.1 MB, AAC, mono
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