MP4 to WAV Converter
Convert MP4 to WAV when you need the soundtrack as uncompressed audio for an editor, a DAW or a transcription service. ProMedia decodes the audio of any MP4, MOV, MKV or WebM and writes 16-bit PCM WAV at the original sample rate, or at 44.1 or 48 kHz if you choose. Files are converted in batches on your own device, with no upload and no size cap.
- Runs on your device
- WebCodecs · GPU
- FFmpeg
- Works offline
Updated
Drop your videos here
How to convert MP4 to WAV
Step 1: Drop one or more MP4 files (or other videos) on the box above.
Step 2: Leave Sample rate on Original, or pick 48 kHz for video projects and 44.1 kHz for music.
Step 3: Choose Channels: Original keeps stereo; Mono halves the file for speech.
Step 4: Press Convert and download the WAV files, one by one or as a ZIP.
Good to know
Settings explained
- Sample rate
- Original keeps the video’s own rate, with no resampling. Pick 48 kHz for video editing or 44.1 kHz for music projects.
- Channels
- Mono halves the file size and is all speech transcription needs.
Formats
Batch-friendly: add many files and they are processed one after another — if one fails, the rest still finish.
How it runs
- Hardware video engine
- Video is decoded and encoded by your device’s media hardware through WebCodecs — usually several times faster than real time.
- FFmpeg (when needed)
- Older formats and a few filters use FFmpeg compiled to WebAssembly. It downloads once (about 31 MB) the first time it is needed and is cached for offline use.
WAV vs MP3: which is better for editing?
WAV is better for editing. It stores every sample uncompressed, so cutting, mixing and effects never add a new layer of compression, and every editor opens it instantly. MP3 is better for listening and sharing, because at 192 kbps it is less than a seventh of the size. Convert to WAV for the work, then export MP3 at the end if you need one.
| Format | Size per minute | Compression | Best for |
|---|---|---|---|
| WAV, 48 kHz, 16-bit | 11.5 MB | None (PCM) | Video editing, Premiere, DaVinci Resolve |
| WAV, 44.1 kHz, 16-bit | 10.6 MB | None (PCM) | Music projects, Audacity, GarageBand |
| WAV, 48 kHz, mono | 5.8 MB | None (PCM) | Speech, transcription, voice-over |
| MP3, 320 kbps | 2.4 MB | Lossy | High-quality listening copies |
| MP3, 192 kbps | 1.4 MB | Lossy | Sharing, phones, podcasts |
What is a WAV file?
A WAV file is uncompressed audio in Microsoft’s RIFF container: a header followed by raw PCM samples, the same kind of data a CD holds. Because nothing has to be decoded, every audio editor, DAW and transcription tool reads WAV directly, and a WAV can be cut and re-saved any number of times without losing quality.
The price is size. Raw samples take far more space than AAC or MP3, which use psychoacoustic tricks to discard what you are unlikely to hear.
Is WAV from an MP4 really lossless?
The conversion is lossless, but it cannot undo the compression already in the video. Almost every MP4 stores its sound as AAC, a lossy codec. ProMedia decodes that AAC once and writes the result to WAV sample for sample, so the WAV sounds exactly like the MP4’s audio, no better and no worse.
What WAV adds is safety for the next steps. Editing and re-exporting an AAC or MP3 file compresses it again each time; working in WAV means the only compression happens once, at the very end.
44.1 or 48 kHz: what sample rate should a WAV be?
Keep the video’s own rate unless a project demands otherwise: Original avoids resampling altogether. If you have to pick, use 48 kHz for anything that goes back into a video timeline, since it is the video standard and the rate YouTube recommends for uploads. Use 44.1 kHz, the CD standard, for music projects and audio-only releases.
- 22.05 or 32 kHz saves space for speech you only need to transcribe, but cuts the high frequencies.
- Mono halves the size and is all a single speaker or a transcription service needs.
- Surround soundtracks may be mixed down to stereo; the Channels line on the result card shows what you got.
Why is the WAV file so large?
Because it stores every sample uncompressed: 48,000 samples a second, per channel, at 2 bytes each. Ten minutes of 48 kHz stereo is about 115 MB as WAV, 8 to 12 times the size of a 192 to 128 kbps AAC soundtrack. That is normal and expected. To share audio, convert the WAV to MP3 afterwards with WAV to MP3, or go straight from the video with MP4 to MP3.
Convert MP4 to WAV on Windows, Mac, iPhone or Android
The converter runs in the browser, so the steps are the same everywhere; only picking and saving files differs.
Windows 10 and 11
Open the page in Chrome, Edge or Firefox and drag the MP4 files from File Explorer. The WAVs land in Downloads, ready for Audacity, Premiere or Reaper.
Mac
Drag videos from Finder or Photos into Safari or Chrome. GarageBand, Logic and Final Cut import the WAV directly.
iPhone and iPad
In Safari, tap the drop zone and choose Photo Library or Choose Files. Save the WAV to Files, where editing apps can open it.
Android
In Chrome, tap the drop zone and pick the video from your gallery. The WAV is saved to Downloads.
Why convert MP4 to WAV with ProMedia
- Video to WAV in one step. No need to export from an editor first; any MP4, MOV, MKV or WebM goes straight to WAV.
- Batch-friendly. Drop a folder of interview clips and get a WAV for each, named after its video.
- Private by design. Interviews, meetings and voice recordings are decoded on your device and never uploaded.
- Precise output. 16-bit PCM at the rate you choose, with the result card showing the sample rate and channels of every file.
Tips & troubleshooting
Want a transcript rather than a WAV? Video to text reads the MP4 directly and runs the speech model on your device.
Need only part of the audio? Convert, then cut the WAV with the MP3 cutter, which handles WAV files as well.
For several formats at once (M4A, FLAC, Opus), use extract audio from video. M4A copies the AAC track without decoding it.
Audacity can only import MP4 audio with its optional FFmpeg library installed; a WAV opens without it.
MP4 to WAV Converter FAQ
How do I convert MP4 to WAV on Windows?
Open this page in Chrome or Edge, drag the MP4 files onto the drop zone and press Convert. The WAV files are saved to Downloads. No software, codec pack or Windows Media Player setting is involved; the audio is decoded in the browser.
Is WAV better than MP3 for editing?
Yes. WAV is uncompressed, so every cut and effect works on the original samples and saving again adds no new compression. MP3 is decoded on import and re-encoded on export, losing a little more each round. Edit in WAV and export MP3 only at the end.
What sample rate should a WAV be, 44.1 or 48 kHz?
Keep the original rate if you can, so no resampling happens. Choose 48 kHz for video editing and 44.1 kHz for music. Both are far above what speech needs, and neither adds quality that the MP4 did not have.
Why is the WAV file so large?
WAV stores raw samples with no compression. One minute of 48 kHz stereo is 11.5 MB, against 1.4 MB for a 192 kbps MP3. Choose Mono for speech to halve it, or convert to MP3 when you are done editing.
Does converting MP4 to WAV improve the sound?
No. The WAV is an exact, uncompressed copy of the MP4’s decoded audio, so it sounds the same. Its value is that further editing does not degrade it, and that every audio tool opens it.
What if my video has several audio tracks?
The main (default) audio track is converted. ProMedia does not offer a choice of track yet, so a second language or commentary track in an MKV is not included.
Is there a file size limit?
There is no upload limit because there is no upload. Videos are read in chunks straight from disk, so multi-gigabyte files work on desktop computers; phones are limited by their memory. There are no daily caps and no watermark.