Will converting WAV to M4A lose quality?

Yes, by definition — M4A is a lossy format, and discarding detail the ear rarely misses is exactly where the size savings come from. At the High setting the difference is inaudible to most listeners on most equipment. Keep the WAV original as your master copy and convert delivery copies from it.

What bitrate will the M4A have?

High encodes AAC at 256 kbps, Standard at 160 kbps, and Small at 96 kbps. AAC is more efficient than MP3, so each level sounds roughly like an MP3 one step higher in bitrate.

Is my file uploaded to a server?

No. The entire WAV to M4A conversion runs locally in your browser. The only thing fetched is the conversion engine itself — a one-time ~31MB download that your browser caches. Your files never leave your device, and there is nothing for anyone else to store.

Why does the first conversion take a moment to start?

The first run downloads the audio engine — FFmpeg compiled to WebAssembly, about 31MB. Your browser caches it, so later conversions start immediately, whether you're converting one file or a whole batch.

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Convert WAV to M4A

Compress WAV recordings to M4A (AAC) — better sound per megabyte than MP3, native to Apple devices.

This conversion runs in this browser tab. The selected file is not uploaded for processing.

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WAV to M4A, step by step.

These steps describe the WAV input and the M4A export for this exact route.

Upload WAV Files

Drag and drop your WAV files or click to browse. You can queue several at once.

Convert in Your Browser

The first run fetches the conversion engine (a one-time ~31MB download); after that, WAV to M4A conversion happens entirely on your device — nothing is uploaded.

Download M4A

Save the converted file right away. Multiple files are bundled into a ZIP for one-click download.

What to expect

What matters for M4A output.

Review the behavior this WAV to M4A tool is designed to preserve, expose, or simplify.

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All processing happens in your browser. Your files never leave your device.

Efficient AAC Encoding

M4A uses the AAC codec, which delivers better sound than MP3 at the same bitrate — the native format of the Apple ecosystem.

One-Time Engine Download

The first conversion fetches a ~31MB audio engine; your browser caches it, and everything runs locally from then on.

Questions about WAV and M4A.

Check the format behavior, limitations, and follow-up options before processing a real file.

When a WAV needs to shrink, M4A is the technically better pick over MP3: AAC delivers cleaner sound at the same bitrate, and every modern phone and browser plays it. It's the natural delivery format for sending recordings to iPhone users, importing into Apple apps, or building audiobook and podcast files. Keep the WAV master; the M4A is the copy that travels.

Related routes

Continue from M4A.

Choose another format only when it matches the next job.

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