Is this WMV 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 WMV 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.

Can I import WMV-sourced M4A into Apple Music or iTunes?

Yes — M4A is Apple's native audio format and imports directly into Apple Music and iTunes. The converted file will appear in your library and can be synced to any Apple device.

What quality M4A output can I expect from a WMV source?

Quality is limited by the source WMV's audio bitrate. High-quality WMV (e.g., 192 kbps WMA) will produce excellent M4A output. Low-quality WMV sources (e.g., 64 kbps WMA) will produce M4A with the same limitation.

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.

WMV to M4A Converter — Free, Online, No Upload

How to convert WMV to M4A online

1
Drop your WMV file
Drag and drop your Windows Media Video 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 Windows Media Video → 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.

WMV vs M4A: format overview

WMV

Windows Media Video

Microsoft · 2003

Compression: lossy
Transparency: No

✓ Good compression for Windows-native workflows
✓ DRM support for content protection
✗ Not supported on macOS, iOS, Android natively

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

WMV magic bytes: 30 26 B2 75 8E 66 CF 11

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

Why convert WMV to M4A?

WMV files recorded on Windows systems carry audio as Windows Media Audio — a codec that Apple's entire ecosystem has always rejected. QuickTime cannot open WMV. iTunes will not import it. Your iPhone cannot play it. If you have recordings, lectures, or presentations in WMV format that you want to enjoy or archive in Apple's ecosystem, the WMA codec is the exact barrier standing in the way.

M4A is Apple's native audio format — AAC audio in an MPEG-4 container. It is the format iTunes uses for purchased music, the format Apple Music streams, and the format that syncs natively to every iPhone, iPad, and Mac. It supports metadata and cover art in the way Apple tools expect, and it plays over AirPlay and in CarPlay without any conversion or plugin on the device.

This converter extracts the audio from your WMV, decodes the WMA, and packages it as M4A. The result is a file that imports directly into iTunes or Apple Music with no extra steps. Audio quality matches the original WMA source at the quality level it was recorded. For the vast majority of spoken-word and corporate audio content, this is perfectly adequate. File sizes are compact — a good match for a music library where storage matters.

Quality & file size: WMV to M4A

Typical file sizes: WMV 50–150 MB → M4A 3–6 MB.

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

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

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

Frequently asked questions

Privacy: how FormatDrop handles your files

Your WMVfiles 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.