Match a project’s sample rate
Use 48 kHz when your video project requires it, or 44.1 kHz when requested by your audio workflow. Resampling changes the sample rate; it does not create missing detail.
Uncompressed audio for your next edit
Convert MP4 to WAV Online
Convert MP4 audio to 16-bit PCM WAV for editing, privately in your browser.
MP4WAV
Local conversionWAV output limit: 128 MiB desktop · 64 MiB mobile. Longer clips may need MP3 instead.
Your media stays on your device.
Private by defaultLocal conversion without media uploads
Your MP4 stays on this device. The browser prepares the WAV locally, and you choose when to download it. No account or media upload is needed.
How to convert MP4 to WAV
- 1
Choose a local MP4
Select one .mp4 file, or drag it from your desktop. The file needs an audio track; H.264 video with AAC audio is the tested combination.
- 2
Set the audio output
The output is 16-bit PCM. Auto keeps the source sample rate and channels. If your editor requires them, choose 44.1 or 48 kHz and mono or stereo. Enable Trim audio to set the start and end of a single excerpt.
- 3
Convert, preview and download
Click Convert to WAV and keep the tab open. Listen to the result, then choose Download WAV. Import the saved .wav file into your audio or video editor.
Prepare audio for another editing step
Choose the channels you need
Mono combines the source channels and reduces PCM file size. Stereo keeps a two-channel output. Auto retains the source channel count; adding a channel cannot create a new stereo recording.
Work with uncompressed PCM
Use the downloaded WAV as an intermediate file for dialogue editing, sound cleanup or a project that accepts PCM audio. This tool converts the first audio track; editing happens in your chosen app.
Tested MP4 input and WAV output
- Input: MP4 containing H.264 video and AAC audio. Other codec combinations are not guaranteed by the .mp4 extension.
- Output: WAV containing signed 16-bit little-endian PCM audio. The video track is excluded.
- One local file and the first audio track per conversion. Optional trimming saves one segment when the video length is available. No URL downloads or batch conversion.
When a WAV file is useful
- Bring spoken audio from a short MP4 interview into an audio editor.
- Prepare a PCM file at the sample rate required by a video project.
- Create a mono intermediate file from a recording when your workflow needs one channel.
WAV, MP3 or the original audio?
WAV for a PCM editing workflow
This tool decodes the source audio into 16-bit PCM. WAV is usually much larger than AAC or MP3, but can be useful when an editor asks for uncompressed audio.
MP3 for a smaller listening copy
For sharing or everyday listening, MP3 is usually a more compact choice. Use the MP4 to MP3 tool to choose a bitrate.
Convert MP4 to MP3Original audio to avoid another encode
If the MP4 contains compatible AAC audio and you want the existing compressed track, Original audio copies it into M4A without re-encoding.
Extract the original audioWhat conversion can and cannot improve
A WAV created from AAC does not restore information that was lost when the source was compressed. Uncompressed output is not a promise of improved sound.
The PCM bit depth is fixed at 16 bits. MP3 bitrate controls do not apply to this output, and 24-bit or 32-bit WAV is not offered.
At 48 kHz, 16-bit stereo PCM uses about 11 MiB per minute, plus a small header. Mono uses about half that amount. Longer recordings can hit the output limit even when the MP4 is small.
WAV size and browser limits
- WAV output must stay below 128 MiB on desktop or 64 MiB on mobile. Reaching this safety limit returns an error and no partial download.
- Input has a soft limit of 500 MiB on desktop and 200 MiB on mobile. Available memory may be lower; these limits do not guarantee completion.
- Start with a short clip. Keep this tab open during conversion, and try a smaller file or mono output if memory or output size is a problem.
- A file without audio cannot produce a WAV. Damaged files and unsupported codecs return an error; no server conversion fallback is used.
Frequently asked questions
Can I convert just a section of the MP4 to WAV?
Yes. Enable Trim audio in Advanced settings and enter start and end times in seconds or hh:mm:ss. Keep the range within the video and at least 0.1 seconds long. If its length cannot be read, complete-file conversion remains available. Input and WAV output limits still apply; the full input may still need to fit in browser memory.
Does converting MP4 to WAV improve sound quality?
No. The converter stores decoded audio as 16-bit PCM. It cannot restore detail already lost in a compressed source such as AAC, remove noise or enhance a recording.
Which WAV settings are available?
The output is signed 16-bit PCM. Sample rate can be Auto, 44.1 kHz or 48 kHz; channels can be Auto, Mono or Stereo. Auto preserves the source settings. There is no MP3 bitrate control for WAV.
Why is my WAV larger than my MP4?
An MP4 can contain heavily compressed audio. WAV stores uncompressed PCM here, so output size depends on duration, sample rate and channel count. At 48 kHz and 16-bit stereo, one minute needs about 11 MiB.
What happens if the WAV reaches the size limit?
Conversion stops with an output-size error. The tool does not offer a truncated WAV as a successful result. Try a shorter source, mono output or the MP4 to MP3 tool for a smaller listening file.
Can I keep the AAC audio instead of making WAV?
Yes. Open Extract Audio from Video, select Original audio and choose the MP4. A compatible AAC track is copied into M4A without another encode.
Is my video uploaded?
No. Conversion runs in a Web Worker on this device. The site downloads its conversion engine when you start conversion, but your media bytes stay in the browser.