WAV to M4A Converter
Inspect your WAV file metadata in the browser, compare WAV vs M4A specs, choose the right bitrate, and copy a ready-to-run FFmpeg command.
WAV File Inspector
Drop a WAV file to read its sample rate, bit depth, and estimated M4A sizes.
Convert with FFmpeg
Free, cross-platform, and supports all WAV variants:
ffmpeg -i input.wav -c:a aac -b:a 192k output.m4a
Replace input.wav with your file path.
Download FFmpeg free at ffmpeg.org.
macOS built-in (afconvert):
afconvert -f m4af -d aac -b 192000 input.wav output.m4a
GUI alternatives
- iTunes / Apple Music — import WAV, right-click > Create AAC Version, rename the output to .m4a (Windows, macOS)
- fre:ac — drag files in, select FDK-AAC encoder with M4A output, click Convert (free, open-source, all platforms)
- VLC Media Player — Media > Convert/Save > select AAC/M4A profile (free, all platforms)
- dBpoweramp — best for batch WAV-to-M4A with ReplayGain tagging (paid, Windows / macOS)
Drop a WAV file on the left to inspect its metadata
No file is uploaded — everything runs in your browser
Reading WAV metadata...
Duration
—
Sample Rate
—
Bit Depth
—
Channels
—
WAV File Size
—
Uncompressed Bitrate
—
Estimated M4A Output Size
128 kbps
—
voice / podcasts
192 kbps
—
music (recommended)
256 kbps
—
high quality
Estimates are based on duration and bitrate. Actual sizes may vary slightly by encoder and content complexity.
Your FFmpeg Command
ffmpeg -i input.wav -c:a aac -b:a 192k output.m4a
WAV vs M4A — Format Comparison
| Property | WAV | M4A |
|---|---|---|
| Compression | None (raw PCM) | Lossy AAC (90–99% smaller) |
| Quality loss | None — lossless | Psychoacoustic loss (inaudible at high bitrates) |
| Typical bitrate | 1,411 kbps (CD stereo) | 128–256 kbps |
| File size (3 min song) | ~32 MB | ~3–6 MB (at 128–256 kbps) |
| Codec | PCM (uncompressed) | AAC (Advanced Audio Coding) |
| Metadata / tags | Limited (INFO chunk) | Full iTunes tags (title, artist, cover art) |
| Device support | Universal | Apple, Android, YouTube, streaming |
| DAW support | Universal | Logic, Ableton, Reaper, most modern DAWs |
| Container | RIFF (.wav) | MPEG-4 (.m4a) |
| Best for | Recording, mastering, DAW | Streaming, mobile, Apple ecosystem |
When to Keep WAV vs. Convert to M4A
Keep WAV when...
- Working in a DAW or audio editing session
- Delivering stems or masters to engineers or clients
- Uploading to platforms that require uncompressed audio
- You plan to process the audio further before final distribution
Convert to M4A when...
- Distributing music to Apple Music, iTunes, or Podcasts
- Sharing audio via email, messaging, or cloud storage
- Syncing music to iPhone, iPad, or other Apple devices
- Reducing storage usage while maintaining perceptual quality
Summary
Inspect your WAV file metadata in the browser, compare WAV vs M4A specs, choose the right bitrate, and copy a ready-to-run FFmpeg command.
How it works
- Drop any WAV file onto the inspector panel to read its metadata via the browser File API.
- The inspector decodes the WAV header to extract sample rate, bit depth, channels, and duration.
- Estimated M4A output sizes are calculated for common bitrates (128, 192, and 256 kbps).
- The FFmpeg command block is updated with your actual filename for a one-click copy.
- Use the copied command in a terminal, or follow the iTunes / fre:ac GUI instructions below.
Use cases
- Compress large WAV recordings to M4A for sharing via email or messaging apps.
- Prepare audio for Apple Music, Podcasts, or iOS apps that require AAC in an MPEG-4 container.
- Reduce WAV file sizes for streaming or web delivery while keeping good perceptual quality.
- Convert studio WAV exports to M4A before uploading to YouTube or social platforms.
- Archive mono voice recordings as small M4A files without perceptible quality loss.
- Check WAV sample rate and bit depth before choosing an appropriate AAC bitrate.
- Generate the correct FFmpeg conversion command without memorizing flag syntax.
- Understand the WAV-to-M4A size reduction before committing to batch conversion.