An MP4 file is a container: it can hold video plus an audio track, often AAC. WAV is usually a container for uncompressed PCM audio. When you convert MP4 to WAV, the video is discarded and the decoded audio is written as PCM. This makes a convenient editing file, but it cannot restore detail that was already removed when the original audio was compressed.
Use this free MP4 to WAV converter when a desktop editor, audio interface workflow, or delivery checklist specifically asks for WAV. WAV files are much larger than MP3 or M4A, so check the reference below before exporting a long recording. The converter uses the source track's decoded audio and exports 16-bit PCM; it does not provide a manual sample-rate control.
A quick size reference
Why a WAV export can be much larger
Uncompressed PCM size is set mainly by sample rate, bit depth, channel count, and duration. These standard stereo examples show the scale; the actual file follows the source track's decoded sample rate and channel layout.
44.1 kHz, 16-bit, stereo
about 10.6 MB / min
A common CD-rate reference for music and general editing.
48 kHz, 16-bit, stereo
about 11.5 MB / min
A common rate for video production and camera audio.
44.1 kHz, 16-bit, mono
about 5.3 MB / min
A useful size comparison for a single-channel voice track.
Estimate: sample rate x bit depth x channels x duration. Container overhead is small. A 60-minute stereo recording at 48 kHz can be roughly 690 MB, so keep the original MP4 until the WAV has opened correctly in your editor.
Under the hood
How the conversion works
WAV is not automatically higher quality
If the MP4 audio track is AAC, the decoder expands that compressed signal into PCM samples. WAV is then uncompressed, but the AAC encoding that came before it remains part of the signal's history. Exporting WAV is useful for compatibility and editing, not for recovering lost detail.
Sample rate and bit depth in this converter
This page exports 16-bit PCM and does not expose a sample-rate selector. The source audio track's decoded rate and channel layout determine the resulting data rate. If a delivery specification requires a particular rate, verify the export in your audio editor before sending it.
WAV, MP3, and FLAC serve different jobs
WAV is easy to edit and broadly accepted, but large. MP3 is compact and convenient for listening. FLAC keeps audio lossless relative to the PCM being encoded while reducing file size, although it is not accepted by every older editor or device.
Choose the right audio file for the next step
The best output depends on what will open or play the file, not just on the extension.
| Format | Best fit | Trade-off |
|---|---|---|
| WAV | Audio editing and specified PCM handoffs | Large files; does not restore quality lost in the source |
| MP3 | Portable listening and smaller sharing copies | Lossy encoding; bitrate affects size and sound |
| FLAC | Lossless storage of decoded PCM | Smaller than WAV, but device support varies |
Common scenarios
When to convert MP4 to WAV
Importing into Audacity or a DAW
Some editing instructions and project handoffs request WAV. Convert the MP4 first, then import the resulting audio into Audacity, Reaper, Logic, or another editor. Keep the MP4 as the untouched source for reference.
Editing dialogue and interviews
A PCM file is straightforward to place on an editing timeline, split, and process. It is a useful intermediate when the editor expects WAV, even though the source may have started as compressed AAC.
Video production handoff
A collaborator may need a separate audio stem to sync with picture or mix independently. WAV avoids another lossy encoding step during that handoff; agree on sample rate and channel layout with the receiving editor.
Preparing a voice track for review
Separate narration from a screen recording or recorded presentation when reviewers need to listen without the video. For long recordings, MP3 is usually smaller if the recipient does not require PCM.
How to
Step by step
- 1
Choose the MP4 file
Drop the video into the converter or use the file picker. The page accepts MP4 and related M4V files; the video track is not part of the WAV output.
- 2
Check that WAV is selected
WAV is selected for this page. The export is uncompressed 16-bit PCM, so a longer stereo recording will take more disk space than an MP3 copy.
- 3
Extract the audio
Start conversion and leave the tab open while it runs. Processing happens in your browser, so large videos may take longer and need available memory.
- 4
Open and verify the WAV
Download the file, import it into Audacity or your target editor, and confirm duration, channels, and sample rate before deleting the source MP4.
FAQ
Frequently asked questions
How do I convert MP4 to WAV in Audacity?
You can extract the audio here, download the WAV, then use File > Import > Audio in Audacity. This is useful when you want a quick browser-based MP4 to WAV conversion before editing. Keep the original video if you may need to resync picture and sound later.
Can I convert MP4 to WAV online without uploading it?
Yes. This converter processes the selected file in your browser and does not send the video to a conversion server. The browser tab still needs to stay open until the export finishes.
Will converting MP4 audio to WAV improve its quality?
No. WAV stores uncompressed PCM, but converting a lossy AAC source cannot recover information discarded during the original encode. WAV can prevent another lossy export and may be required by an editor or delivery workflow.
How large is a 44.1 kHz WAV file?
For 16-bit stereo PCM, allow about 10.6 MB per minute at 44.1 kHz. Mono is about half that size. The actual export depends on the source track's sample rate, channels, and duration.
Can I use FFmpeg to convert MP4 to WAV?
A typical command is ffmpeg -i input.mp4 -vn -c:a pcm_s16le output.wav. If a workflow requires a specific sample rate or channel count, add the appropriate FFmpeg options and verify the output properties.
See also
Related converters