Change M4A sample rate
Upload an M4A file and resample it to the sample rate you need.
New sample rate
Upload an M4A file and resample it to the sample rate you need.
Your M4A is decoded, resampled, and re-encoded as AAC at the new rate. As with any lossy round trip there is a small quality cost, minimized by a high output bitrate.
Voice memos are frequent visitors here: recorded at 48 kHz on the phone, then required at 16 kHz by a transcription service or voice API.
For speech, yes. 16 kHz preserves the full intelligibility band; it is what most speech engines are trained on.
Film and broadcast standardized on 48 kHz, so editors assume it. Matching it avoids silent resampling and potential drift.
Yes, the entire process is local to your browser.