Skip to content
FileTools360
AudioLosslessRuns in your browser

MP3 to WAV Converter

Turn MP3 files into WAV in a couple of clicks. MP3 is the universal lossy audio format; WAV is uncompressed PCM audio. The conversion is lossless — every pixel, sample or byte in the source is preserved.

Not uploaded to any serverConverted on this deviceGone when you close the tabHow this works

Drop your files here

MP3 files (.mp3) · up to 300 MB each

or paste files from your clipboard

Ready when you are

Drop a MP3 file above and FileTools360 will turn it into WAV — right here on your device, without uploading anything.

⌘K to search converters

How to use it

  1. 1

    Add your MP3 files

    Drag them onto the drop area, choose them from your device, or paste them from your clipboard. You can queue several at once. Nothing is sent anywhere — the file stays on this device.

  2. 2

    Adjust the settings if you want to

    The defaults suit most people. Open Advanced to control bitrate, sample rate and channels.

  3. 3

    Convert and download

    Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

Privacy, in plain words

Is it safe? Your MP3 file is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your MP3 file is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

An audio file is a conversation. Transcribed by machine — which is cheap now — it becomes searchable text about whoever was speaking. It matters more than it sounds, because of what audio files usually are:

Meeting audio

internal discussion, named people, unannounced decisions

Unreleased music

work whose commercial value depends on control of the master

Call recordings

both sides of a conversation, often legally sensitive

Interviews

a source's voice is identifying even when the name is not said

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

MP3 and WAV explained

MP3 is the lossy audio format that made digital music portable. Its patents expired in 2017, which is part of why it remains ubiquitous — anyone can implement it freely.

WAV stores uncompressed PCM audio — the raw samples, exactly as captured. A stereo CD-quality minute is roughly 10 MB, which is the price of having no compression whatsoever.

Where MP3 files come from
Music libraries, podcasts and voice recordings.
Where WAV is used
Recording sessions, sample libraries and audio editing.

MP3 vs WAV

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

MP3 compared with WAV
PropertySourceTarget
CompressionLossyUncompressed
Introduced19931991
Browser supportPlays absolutely everywhere.Universal.
MP3 is stronger at
Plays on absolutely everything, including old hardware. Small files. No licensing constraints since 2017.
WAV is stronger at
Perfect fidelity with zero compression artefacts. No decoding overhead, so editors scrub instantly. Universally supported.

Why convert MP3 to WAV?

People make this switch when they run into the limits of MP3: archiving masters, or editing audio you will re-export repeatedly. WAV is the better fit when recording, editing, mastering, or handing audio to another tool.

Be aware of the size trade-off: WAV is uncompressed, so expect the converted file to be considerably larger than the MP3 you started with.

MP3 limitations that prompt the switch
Lossy — discarded detail cannot be recovered. Beaten on quality-per-byte by AAC and Opus. No native support for multichannel audio in practice.
What you give up
Very large files. No standard metadata support worth relying on.

Does converting MP3 to WAV reduce quality?

Going from MP3 to WAV moves already-compressed data into a format that stores it exactly. Nothing is lost from this point on, but nothing is recovered either — the detail MP3 discarded when the file was first created is gone permanently. Expect a noticeably larger file for identical audio quality.

Measured, not estimated

What converting MP3 to WAV actually costs

The WAV came out 5.3× larger than the file that went in.

Each row is one sample chosen to isolate a property these formats treat differently.
SampleMP3 inWAV outChange
An easy clipThe compressible end of the range — a clean tone, or a moving test pattern — where a codec does its best work.32.3 KB172 KB5.3×
A hard clipThe other end — pink noise, or dense video grain. Close to incompressible by design, and the worst case for every codec.32.3 KB172 KB5.3×

Produced by this site's own converter. The same code that runs in your browser, at the same default settings, so these are the bytes you would download.

Samples are generated from a fixed seed rather than taken from real photographs or documents, so the corpus is reproducible and carries no licensing question — and so the numbers predict the shape of your result rather than its exact size. Measured 2026-10-01. The method, and the command that regenerates every figure on this page, are on the how it works page.

About these formats

Source

MPEG-1 Audio Layer III

The universal lossy audio format.

Extensions
.mp3
MIME type
audio/mpeg
Best for
Music players · Podcasts · Maximum compatibility
Compatibility
Plays absolutely everywhere.

Target

Waveform Audio

Uncompressed PCM audio. Perfect quality, big files.

Extensions
.wav, .wave
MIME type
audio/wav
Best for
Editing and mastering · Sound design · Archival
Compatibility
Universal.

The output is a lossless container, but the audio inside it was already compressed. You get a bigger file, not better sound.

Good to know

MP3 to WAV Converter — questions

How do I convert MP3 to WAV?

Drop your MP3 file onto the area above, then press Convert. The WAV file saves straight to your device. You do not need an account, and there is no watermark.

Is it safe to convert MP3 files here — are they uploaded to a server?

No, nothing is uploaded. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website; it is converted there and sent back. That copy is what "upload" means, and it is the part that puts your file out of your control. This site does not do it. Your MP3 file is read and converted by the browser you are using right now and never leaves this device, so there is no copy for anyone to store, read or hand over. You can prove it: turn off your Wi-Fi after this page loads and the conversion still works.

Can I convert confidential MP3 files, like bank statements or contracts?

Yes, and that is the case this site was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder — there is no transfer, no copy on someone else's hardware, no retention period to read about and no staff with access. Nothing is logged about the file either: not its name, not its size, not its contents. The one thing worth saying plainly is that this protects the file in transit and at rest on our side, not from anything already on your own computer.

What should I know before converting MP3 to WAV?

The output is a lossless container, but the audio inside it was already compressed. You get a bigger file, not better sound.

Does converting to WAV reduce quality?

No. WAV is a lossless format, so the conversion preserves exactly what is in your MP3 file. Note that it cannot recover detail that was already discarded when the MP3 was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 300 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android. Pick the file from wherever your phone stores it — Files on iOS, or your downloads folder on Android. Long recordings may run out of memory on an older phone.

Read more about these formats

MP3 vs WAV: What's the Difference?

The difference is real, but converting between them only helps in one direction.

Related converters

All audio converters
WAV → MP3
MP3 → AAC
MP3 → AIFF
MP3 → FLAC
MP3 → M4A
MP3 → OGG
MP3 → Opus
MP4 → WAV

Runs entirely in your browser

FileTools360 by the numbers

527 converters and tools65 file formatsnothing ever uploaded.