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.
WAV is not a codec, it is a wrapper around uncompressed PCM, and that is the whole point: nothing is re-encoded, so nothing is lost. Our WAV output is 16-bit PCM at the source sample rate — 44.1 kHz for most music, 48 kHz for video and phone recordings — which is what Audacity, Reaper, Premiere, DaVinci Resolve and Logic expect to import.
The trade-off is size. 16-bit stereo at 44.1 kHz is about 10 MB per minute, so a one-hour recording becomes roughly 600 MB. Export WAV when the audio will be edited, mastered, transcribed or analysed; export MP3, M4A or Opus when it will be sent, posted or played.
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.
Size maths before you export
16-bit stereo PCM: about 10.1 MB per minute at 44.1 kHz, about 11 MB per minute at 48 kHz. One hour is roughly 600 MB, three hours about 1.8 GB. If that is more than you need, FLAC is the lossless alternative at roughly half the size.
WAV for editing, MP3 for delivery
Every lossy encode discards detail. If the audio will be cut, normalised, de-noised or time-stretched, do that work on WAV and encode to MP3 once, at the end. Editing an MP3 and re-exporting it adds another generation of loss.
What WAV does not do
WAV carries no loudness normalisation and, in our output, no tags or cover art. Levels are exactly what was in the MP4: if the recording is quiet, normalise it in your editor. Add metadata when you make the final MP3 for distribution.
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
clip.mp4
Output: WAV · Lossless
OptionsConversion runs locally · this tab stays online during processing.
Extract audio- 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.
Is WAV truly lossless compared with the audio in my MP4?
Yes. The AAC audio is decoded once and written as uncompressed PCM. No second lossy encode happens, unlike exporting MP3 or AAC.
How big will my WAV be?
About 10 MB per minute for 16-bit stereo at 44.1 kHz, roughly 600 MB per hour. Choose FLAC if you need lossless quality at about half the size.
Which sample rate does the WAV use?
The source rate is preserved — 44.1 kHz for most music, 48 kHz for video and phone recordings. We do not resample; convert in your editor if a target requires a specific rate.
Why does my WAV sound quiet?
Because the source is quiet. WAV has no loudness processing and we pass levels through untouched. Normalise or compress in your editor; for podcast delivery aim around -16 LUFS.
Can I convert only part of the video?
Yes. Convert once, then select the range on the waveform and export the selection as WAV. The file is never re-read from disk, so trimming costs only time.
WAV or FLAC for archiving an interview?
FLAC. It is also lossless, carries metadata properly and is roughly half the size of WAV. Use WAV when the next step is an editor or DAW that wants PCM.
See also
Related converters