M4A to MP3 Converter
Convert M4A voice memos and audio files to MP3. No uploads, no software.
Best for sharing iPhone voice memos with people on Android, Windows, or older devices that reject M4A.
Drop files or a folder here
or click to browse · paste from clipboard
Accepts .M4A · Up to 1,000 files
How it works
Drop your files
Drag and drop, click to browse, or paste from clipboard. Up to 1,000 files at once.
Choose settings
Adjust quality, format, and other options to match your needs.
Click Convert
Everything runs in your browser via WebAssembly. M4A to MP3 Converter happens locally — no server involved.
Download
Download files individually or grab all at once as a ZIP.
Frequently asked questions
M4A is an Apple audio format that's an AAC audio track sitting inside an MPEG-4 container. This format will play on Apple devices like iPhone, Mac, or iPad and most newer media players, but it's not compatible with older Android apps and car audio equipment. If you record a podcast in this format, converting it to MP3 would allow you to upload it to podcast platforms, and it is the more universally accepted format for audio files.
There will be slight degradation since both M4A (AAC) and MP3 are lossy formats, and converting between them requires a lossy-to-lossy transcode. If you choose a bitrate of 192 kbps or higher, the difference isn't noticeable for most people. For voice memos, 128 kbps will be sufficient. Regardless, you still need to keep the original M4A files in case you need the best possible audio copy.
Choose 128 kbps for most use cases: recordings, podcasts, or voice memos. There isn't much difference in the audio output between the original M4A file and the MP3 equivalent. But if you're converting a music file, use a bitrate between 192 and 256 kbps. Only use 320 kbps if you plan to reuse the MP3 for another project because re-encoding a lossy file will degrade quality further.
Yes, you can convert up to 1,000 M4A files in a batch, and ConvertYard will process each file individually in the browser and combine them into a ZIP for download.
Never. Conversion runs entirely in your browser using ffmpeg.wasm — a full media processing engine compiled to WebAssembly. Your files never leave your device. ConvertYard's servers only deliver the tool code — they never see your files.