Is this WAV to M4A converter really free?

Yes. Up to 5 files at a time, no signup, no catch. The free tier adds a small watermark to image output — Pro ($9.99/mo or $49/yr) removes it, raises the file size limit to 500 MB, and unlocks unlimited batch conversion.

Are my files uploaded to a server?

No — and you can verify it yourself. Open DevTools → Network tab, then convert a file. You'll see zero upload requests. Everything runs right in your browser. We never see your files.

How long does conversion take?

Usually 1–3 seconds for a typical file. The very first conversion on a fresh page load may take 5–20 seconds while the converter engine loads — after that it's instant. Your CPU does all the work locally.

What is the file size limit?

Free: up to 10 MB per file, 5 files per batch. Pro: up to 500 MB per file, unlimited batch. If you're working with large videos or RAW photos, Pro is built for that.

Can I batch convert multiple WAV files at once?

Yes — drop multiple files at once (or Ctrl/Cmd+click to select them) and they all convert in parallel. Free accounts handle up to 5 files per batch; Pro has no limit.

What bitrate will the converted audio use?

We default to 192 kbps for MP3, 128 kbps for OGG/Opus, and 320 kbps for M4A/AAC. These settings are perceptually transparent — most listeners can't tell the difference in a blind test.

Will my metadata (ID3 tags, album art) be preserved?

Yes, when both formats support it. Tags carry over on conversions like MP3→M4A or FLAC→MP3. WAV has limited tag support, so some metadata may not transfer.

What's the difference between M4A and AAC?

M4A is just an MP4 container holding AAC-encoded audio. When you hear 'M4A', think 'AAC in an MP4 wrapper'. They're the same codec; M4A is the file extension Apple popularised for music.

Will my WAV converted to M4A work in iTunes and Apple Music?

Yes — M4A is Apple's preferred audio format and is natively supported by all Apple devices, iTunes, and Apple Music without any additional software.

How private is this converter?

Completely private — by design, not policy. There is no upload endpoint. Files are processed right inside your browser tab and disappear the moment you close it. We collect only anonymous page-view counts; your file content is never seen or stored.

WAV to M4A Converter — Free, Online, No Upload

How to convert WAV to M4A online

1
Drop your WAV file
Drag and drop your Waveform Audio File Format file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs Waveform Audio File Format → MPEG-4 Audio entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your M4A
Your MPEG-4 Audio file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

WAV vs M4A: format overview

WAV

Waveform Audio File Format

Microsoft and IBM · 1991

Compression: none
Transparency: No

✓ Lossless — no quality degradation
✓ Universal DAW compatibility for production
✗ Extremely large file sizes

M4A

MPEG-4 Audio

Apple / MPEG Group · 2001

Compression: lossy
Transparency: No

✓ Better quality than MP3 at same bitrate (AAC codec)
✓ Native Apple ecosystem support

WAV magic bytes: 52 49 46 46 xx xx xx xx 57 41 56 45

M4A magic bytes: 00 00 00 xx 66 74 79 70 4D 34 41

Why convert WAV to M4A?

WAV's uncompressed size makes it impractical outside of production environments. A three-minute song is roughly 30 MB as a WAV — too large to email, too heavy to sync in bulk to a device, and larger than any streaming service or podcast host expects. When your destination is an Apple device, iTunes, Apple Music, or a podcast hosting platform, M4A (AAC wrapped in an MPEG-4 container) is the natural output format.

M4A is Apple's default audio container. It's what iTunes purchases come in, what GarageBand exports, and what iPhone voice memos record. Uploading M4A to Apple Podcasts works without transcoding. Adding M4A to an iTunes library works immediately, with album art and full metadata support. At 256 kbps AAC, the M4A will be indistinguishable from the WAV source in any reasonable listening environment, and the file will be about 95% smaller.

Because WAV is lossless, converting to M4A is a first-generation encode — you're not stacking lossy codec on top of lossy codec. The AAC encoder gets clean uncompressed audio to work from, which produces the best possible M4A result. The output will be fully compatible with every Apple device, GarageBand, Logic Pro, and any platform that accepts AAC or M4A files.

Quality & file size: WAV to M4A

Typical file sizes: WAV 30–50 MB → M4A 3–6 MB.

Both WAV and M4A use lossy compression. We transcode at high quality settings (equivalent to M4A's recommended web quality) to minimize generational loss.

Color depth: WAV supports standard color, M4A supports standard color.

Transparency: WAV does not support transparency. M4A does not support transparency — transparent areas become solid white.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your WAVfiles are converted 100% inside your browser. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.