MP3 → M4A
MP3 to M4A
Convert one supported MP3 stream into AAC-LC in an M4A container.
Temporary cloud processing. Enable JavaScript to select and convert a file.
About this conversion
What happens
After consent, conversion runs offline, preserves the admitted mono/stereo rate and layout, removes metadata, and publishes only an independently validated fast-start M4A.
Limits
250 MiB input. 15 minutes, up to 0×0, and 100 MiB output.
Things to know
The output uses a fixed 128 kbit/s target. This lossy transcode improves M4A compatibility but cannot restore detail missing from the MP3. Malformed MP3, extra streams, unsupported rates or layouts, excessive duration, timeout, or invalid AAC/M4A output fail closed.