Convert M4A to WAV Online
Convert M4A to WAV online — nothing to install, and nothing uploaded. The decode runs in this browser tab and the WAV lands straight on your disk.
Drop your M4A file here or click to browse
M4A (.m4a) · Max 20 MB
M4A to WAV is a conversion that punishes normal online converters, because the file gets much bigger on the way out. You upload a compact 5 MB recording and wait to download roughly 50 MB of uncompressed audio — the result is the slow part, and on a modest connection it is the whole experience. This page has neither transfer: it loads FFmpeg as WebAssembly, decodes the M4A on your own machine, and writes the WAV directly.
That removes the upload, the queue, and the oversized download. A voice memo decodes in about a second, and a long interview is limited only by your own hardware rather than a shared server.
The privacy angle is not decorative here. M4A is the format iPhones use for Voice Memos, so the files people convert are overwhelmingly personal: interviews, lectures, therapy notes, meetings, ideas recorded in a car. Sending those to an unfamiliar service is a real decision, and here you do not have to — load the page, go offline if you like, and it still converts.
It runs the same in Chrome, Firefox, Edge, and Safari, on Windows, macOS, Linux, iPhone, and Android. Nothing to install, nothing to update, no bundled adware — the actual reason to want an online tool.
What you get is standard 16-bit PCM WAV at the source's sample rate: the universal flavour that Pro Tools, Logic, Ableton, Reaper, Audacity, Premiere, and every transcription service read without complaint. It will not sound better than the M4A — that audio is already lossy — but nothing you do to it afterwards will cost you anything further.
Frequently Asked Questions
Is it safe to convert M4A to WAV online?
With most online converters your recording is uploaded to their servers — a real consideration, since M4A files are usually private voice memos and interviews. Here nothing is uploaded: the decode runs in your browser and works even offline once the page has loaded.
Why is this faster than other online converters?
Because M4A→WAV makes the file about 10× bigger, so downloading the result is normally the slowest part. Decoding locally means no upload and no oversized download — the WAV is written straight to your disk.
What are the output specs?
Standard 16-bit PCM WAV at the source's sample rate — the universal flavour every DAW, video editor, and transcription service accepts.
Will the WAV sound better than the M4A?
No — M4A is lossy AAC and the lost detail can't be recovered. The gain is compatibility and a loss-free editing chain from that point on.
Is there a size limit?
Free accepts inputs up to 20 MB with a 10-second output preview; Pro raises it to 500 MB with full-length output — which is what long interviews need.
About M4A
Apple's preferred audio format. Better quality than MP3 at same bitrate. Default for iTunes and Apple devices.
About WAV
Uncompressed audio format. Perfect quality with no data loss. Standard for music production and professional audio work.