MP4 to WAV Converter

How to Convert MP4 to WAV Online

1. Upload Your MP4 Video: Drag and drop, or click "+ Add Files" to select MP4 or M4V files from your computer. Batch upload is supported — process several videos with the same WAV settings in one pass.
2. Pick Audio Sample Rate: Default is "Original" (matches the MP4's embedded audio — usually 44.1kHz or 48kHz). Pick 44.1kHz for music/CD-standard projects, 48kHz for video post-production and broadcast, 96kHz only if your source was recorded at that rate. Resampling upward from a 44.1kHz source adds no quality.
3. Set Audio Channel and Trim (Optional): Leave "Audio Channel" on Original to keep stereo as-is, switch to Mono to halve the file size for spoken-word recordings, or Stereo to force two channels. Use "Trim" with start time and duration (HH:MM:SS.ms) to extract just the audio segment you need instead of the full track.
4. Convert and Download: Click "Convert". The MP4's audio stream is decoded from AAC to uncompressed 16-bit PCM and packaged as WAV on our servers — no sign-up, no watermark, no quality cap.

Why Convert MP4 to WAV?

MP4 is a container that almost always carries AAC audio at 128-256 kbps — a lossy compression format. WAV is the opposite: raw PCM samples with no compression, the format every digital audio workstation (DAW) treats as its native working file. Converting MP4 to WAV doesn't recover audio detail the AAC encoder discarded, but it stops further generational loss and gives you a file every editor on every platform can open without a codec install.

• DAW import without codec friction — Pro Tools, Logic Pro, Ableton Live, Adobe Audition, FL Studio, and Cubase open WAV natively. Audacity on Windows and Linux needs the optional FFmpeg library installed before it will read MP4; WAV works on every Audacity build on every OS without setup. (Audacity FFmpeg library docs)
• Podcast and dialogue editing — Extract a 60-minute interview from an MP4 screen recording, drop the WAV into Descript, Hindenburg, or Auphonic, and edit without re-encoding artifacts compounding each save.
• Music sampling and stem work — Pull a vocal or drum loop from a music video for sampling. WAV preserves the full decoded waveform so EQ, pitch-shifting, and time-stretching plugins have the cleanest input the lossy source can provide.
• Broadcast and post-production handoff — 48kHz/16-bit WAV is the standard interchange format for film and TV post. Editors, sound designers, and dialog mixers expect WAV in the deliverables spec, not MP4 audio.
• Sample-accurate trimming — Cut precise audio segments by HH:MM:SS.ms with the Trim controls before download, instead of exporting the full track and editing later.
• Reverse the workflow with related conversions — Need a smaller working file? See MP4 to MP3 for lossy compression or MP4 to FLAC for lossless compression at roughly half the WAV size. Going the other way? WAV to MP3 handles the final encode for distribution.

WAV vs MP4 Audio (AAC) — Format Comparison

WAV Size Cheat Sheet (Stereo)

A 192kHz/24-bit file is roughly 6.5x the size of a 44.1kHz/16-bit file at the same duration — only pick higher rates if your source was actually captured at that resolution.

MP4 Audio → WAV vs FLAC vs MP3 — Pick by Workflow

WAV and FLAC contain the same audio data after decode — the choice is just storage vs universal-tool compatibility. MP3 re-compresses the already-AAC source, which is why audio engineers route through WAV first whenever possible.

Frequently Asked Questions

Does converting MP4 to WAV improve audio quality?

No. The audio in the MP4 was encoded with AAC (lossy), and information the encoder discarded cannot be reconstructed. Converting to WAV decodes the AAC to uncompressed PCM, which preserves what's there and prevents any further quality loss from re-encoding to a different lossy format. It does not add detail.

What sample rate should I pick?

Match your source if you can. Most MP4 video uses 48kHz audio (the standard for video) — pick 48kHz to avoid resampling. Use 44.1kHz only if the MP4 itself is at 44.1kHz (common for ripped music videos) or if your downstream workflow is CD-targeted. Going above the source rate creates a larger file without adding any information.

Why are my WAV files so much larger than the MP4?

WAV is uncompressed. A 4-minute stereo track at CD quality is about 42 MB as 16-bit/44.1kHz WAV but only ~4 MB as the 128 kbps AAC inside the MP4 — roughly a 10x difference. The trade-off is universal DAW compatibility and no further compression artifacts. If size is the issue, FLAC gives you the same audio in about half the WAV size; see the comparison table above.

My converted WAV is 16-bit. Can I get 24-bit?

The converter writes 16-bit PCM by default, which matches the practical resolution of AAC source audio. AAC is roughly equivalent to 16-bit precision, so a 24-bit WAV from an AAC source carries the same actual audio detail in a 50% larger file — useful only if your downstream tool requires 24-bit input.

Can Audacity open MP4 directly instead?

On macOS, Audacity imports MP4/M4A as shipped. On Windows and Linux you have to install the optional FFmpeg library through Edit > Preferences > Libraries — a step many users hit a wall on. Exporting to WAV first avoids the codec install entirely; WAV imports into any Audacity build on any OS without configuration.

Will conversion preserve multi-channel surround audio?

If the MP4 contains 5.1 surround AAC, the converter currently outputs stereo or mono via the Audio Channel control. For surround workflows, keep the original MP4 and let your DAW handle the multi-channel decode directly.

Can I extract just a portion of the audio?

Yes. Use the Trim control under Advanced Options. Enter the start time and duration in HH:MM:SS.ms format — only that segment is decoded to WAV, which keeps the output file small when you only need a clip from a long video.

Does the converter handle batch uploads?

Yes. Drop multiple MP4 or M4V files at once and the same sample rate, channel, and trim settings apply to each. Each file produces its own WAV output. For trimming audio further after conversion, the Audio Cutter tool works on the resulting WAV.

What input formats are accepted besides MP4?

The page accepts .mp4 and .m4v (iTunes/Apple video). For other video containers, see MOV to WAV. If you only need lossless compression instead of raw PCM, MP4 to FLAC cuts file size by about half with identical audio after decode.