Convert MP3 to WAV
Turn MP3s into plain 16-bit WAV files that every editor, burner and sampler opens, on your own device.
- Nothing is uploaded
- Works offline after first use
- Open source
- No sign-up, no watermark. The limit is your device’s memory (phones hold less).
Convert MP3 to WAV in your browser for audio editors, CD burning, DJ software and transcription. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The limit is your device’s memory, which is smaller on a phone, and after your first run the page works offline.
Your iPhone may take a few seconds to prepare the video first, longer if it's stored in iCloud.
Done
Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
People convert MP3 to WAV because some program on the other end refuses MP3. Audio CD burning software writes discs from WAV, older samplers and drum machines load only uncompressed files, some DJ and karaoke systems want WAV, Twilio and other phone systems ask for WAV prompts, and many speech and transcription tools are happiest with plain PCM. A WAV is the lowest common denominator: raw samples with a short header.
Converting will not make an MP3 sound better. MP3 throws away detail when it is encoded, and decoding it to WAV stores what is left without losing more. The WAV is roughly ten times larger than the MP3 it came from (about 10 MB per minute in stereo), but it is now safe to cut, fade, normalise and re-export as often as you like, which is why editors work in WAV.
This page decodes each MP3 with your browser’s own MP3 decoder and writes a 16-bit, 44.1 kHz PCM WAV, the CD format. MP3s at 44.1 kHz, which is nearly all of them, keep their sample rate; the rare 48 kHz or 32 kHz file is resampled. Stereo stays stereo unless you pick mono, which halves the size for spoken word.
MP3 encoders add a few milliseconds of silence at the start and pad the end of the last frame, and not every decoder removes it. If you are cutting loops that must repeat seamlessly, trim the WAV in your editor. For podcasts, songs and voice recordings the difference is inaudible.
How it works
- Drop one or more MP3 files, or tap to pick them. A whole album converts in one go.
- WAV is already chosen. Keep stereo for music, or pick mono for a single voice.
- Convert. One WAV downloads directly; several come in a zip.
In your browser, not on a server
Your browser decodes the sound track with the same audio decoders it uses to play media on any website (AAC for MP4, MOV and M4A; Opus or Vorbis for WebM; FLAC, WAV and MP3). The samples are resampled to 44.1 kHz and handed to LAME, the reference MP3 encoder, compiled to WebAssembly and served by this site. WAV files are written directly by a few lines of code in the page. Everything happens in memory in your tab.
Compared with upload-based tools: Online converters upload the whole video just to keep its sound, cap free files at a few hundred megabytes, and make you wait in a queue. Home videos, lectures and voice memos are personal. Here the file never leaves your device, so a 1 GB video converts as fast as your computer can read it, and the limit is your device’s memory (phones hold less).
Verify it yourself. Give the page a short while after your first run to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Will converting MP3 to WAV improve the sound?
No. The WAV holds exactly what was left in the MP3, uncompressed. It stops further loss while you edit, but it cannot bring back what the MP3 encoder removed.
Can I burn these WAVs to an audio CD?
Yes. They are 16-bit, 44.1 kHz stereo, the Red Book CD format, so burning software such as Windows Media Player, Music on a Mac or ImgBurn writes them without converting again.
Why is the WAV so much bigger than the MP3?
A 128 kbps MP3 stores about 1 MB per minute. Uncompressed CD-quality stereo needs about 10 MB per minute. That is the cost of storing every sample as is.
Do ID3 tags, cover art and titles carry over?
No. WAV has no widely supported place for them, so the file name is all that identifies each track. Keep the MP3s if you want the tags.
Is the file uploaded anywhere?
No. There is no server in this process. The page is a static file and the work is done by code running inside your browser tab. Give the page a short while after your first run to save itself for offline use; then you can turn off Wi-Fi and it still works.
More video and audio tools
Video to MP3
Pull the sound out of a video, or turn any audio file into an MP3. Your files are converted on this device and never uploaded.
Video to GIF
Trim a clip, pick a size and frame rate, and get a looping GIF. The video is decoded by your browser and never leaves this device.
GIF to MP4
Turn animated GIFs into small MP4 videos that post and play anywhere. Converted on this device, never uploaded.
Compress video
Make a video a fraction of the size, or fit it under a limit like 10 MB for Discord or 25 MB for email. It is compressed on this device and never uploaded.
Other conversions
Guides
- How to convert a video to MP3This is different from muting a video: you want the sound saved as its own file. Most devices have no built-in way to do that.
- A free Zamzar alternative with no daily limitZamzar's free service limits how many files you can convert and how big each can be. Here is an alternative with no such cap.
- A free FreeConvert alternative with no processing time capFreeConvert's free plan limits the processing time for each file and for the day. Here is an alternative with nothing to time out.
- Is CloudConvert safe?For most files, yes: it is an established, certified service. The real question is whether a given file should leave your computer at all.
- Is FreeConvert safe?FreeConvert is a legitimate service with a clear deletion policy. Whether it is safe for a particular file depends on whether that file should be uploaded anywhere.