Convert MP3 to WAV MPEG Audio Layer III ↔ Waveform Audio Free Online Secure
Your MP3 is decoded here in your browser and written out as an uncompressed 16-bit WAV, which is what editing and mastering software expects. Nothing is uploaded.
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Where these formats come from
MP3 came out of years of research at Fraunhofer and was standardised in 1993 as part of MPEG-1. Its trick is psychoacoustic: it throws away the sound a human ear is unlikely to notice, mostly quiet detail masked by louder sound nearby, and it was that trick which made music small enough to travel over a modem. AAC — the thing inside an .m4a file — was designed as its successor and does the same job better at the same size. Ogg Vorbis appeared in 2000 as the patent-free answer, at a time when MP3 still had to be licensed. FLAC compresses without discarding anything, giving back the identical recording at about half the size, and WAV stores the raw samples with no compression at all.
Where you meet them
MP3 is still the format that plays on anything with a speaker, which is why it is the safe choice for sending something to a stranger. M4A is what Apple devices and most phones record and buy in. OGG travels inside games and open-source software. FLAC is for archiving a collection or ripping a CD when the original quality must be kept. WAV is the working format of recording and editing, where the file is opened and saved repeatedly and compression artefacts would accumulate.
Questions people ask
Will converting my MP3 to FLAC restore the quality?
No. FLAC will preserve perfectly whatever it is given, but what it is given here is already an MP3 — the detail removed when the MP3 was made is gone, and no later format can invent it back. You end up with a file several times larger that sounds exactly like the MP3. Converting to a lossless format is worth doing only from a lossless source; from an MP3, the honest answer is to keep the MP3.
Each time I convert, does it sound worse?
Between lossy formats, yes — a little. MP3, AAC and Vorbis each decide separately what the ear will not miss, and each conversion decodes the previous guess and makes a fresh one on top of it, so the losses accumulate. Converting once rarely matters; converting back and forth repeatedly does. Lossless formats have no such problem: WAV to FLAC to WAV returns exactly the samples you started with.
Does the file lose quality?
It depends on what the two formats can hold. Converting between formats that store the same thing — a PNG to a BMP, a WAV to a FLAC — loses nothing. Converting into a format that throws information away to save space, such as JPEG or MP3, loses a little every time, and converting back does not bring it back. Where a choice exists, this page errs towards keeping the original quality rather than making the smallest file.
Is my file uploaded anywhere?
No. The conversion happens inside your browser, on your own machine; the file never leaves it and there is no server here that could receive it. That is why a large file is limited by your own memory rather than by an upload, and why nothing you convert can appear in anybody's logs — including ours. The audio and video tools do fetch their conversion engine from this site the first time you use them, some thirty megabytes once; after that the work still happens entirely on your machine.
Why people convert MP3 to WAV
MP3 is the format that plays everywhere, but it is not always the format a program wants. Audio editors, mastering tools, video editors, some sampling software, some hardware samplers and a few older systems expect WAV: a plain, uncompressed format that every audio program understands and that carries no surprises. When you have a piece of sound as an MP3 and a program refuses it, or handles it badly, the practical answer is to convert MP3 to WAV. The program gets the format it expects, and you can get on with the job.
The situations are ordinary. A voiceover delivered as MP3 that must go into a video editor which prefers WAV. A music clip to be loaded into a sampler. A recording to be edited in a program that works on uncompressed audio. A sound to be burned onto a CD by software that requires WAV. A piece of audio to be sent to a studio that asks for WAV files. In each case the MP3 is what you have, WAV is what the next step needs, and converting MP3 to WAV bridges the gap.
This page converts MP3 to WAV in your browser. Your recording is not uploaded to a server, which matters for unreleased music, private recordings and confidential material. Below you will find how the conversion works, what is kept, the single most important thing it cannot do, and when it is the right move.
How the conversion works
Decoded here, written as an uncompressed 16-bit WAV
Your MP3 is decoded in your browser, which means it is turned back into raw sound, and then written out as an uncompressed 16-bit WAV. That is the standard form of WAV: sixteen bits per sample, which is the same depth as an audio CD, and what editing and mastering software expects. Nothing is uploaded: the work happens on your own device.
Plain PCM that every program opens
The WAV is plain PCM, the simplest way of storing sound as a series of measurements. Because it is so basic, every program opens it, from the most advanced digital audio workstation to the plainest media player. That universality is the reason WAV is the working format of the audio world.
What "16-bit" means
Each measurement of the sound is stored with sixteen bits of precision, which gives sixty-five thousand levels of loudness. That is the depth used on audio CDs, and it is more than enough to hold everything an MP3 contains. Some studios work at higher depths, but for material that started as an MP3, there is nothing extra to store.
What is kept
The full length and the sample rate
When you convert MP3 to WAV here, the full length of the recording is kept, and so is its own sample rate, which is how finely the sound was sampled. The WAV is not resampled to a different rate, so it matches the MP3 exactly in timing and pitch. A four-minute track stays four minutes.
Both channels
Both channels of a stereo recording are kept, so a stereo MP3 becomes a stereo WAV. A mono MP3 stays mono. The sound image is unchanged.
What this does not do
It does not undo the compression
This is the most important thing to understand, because it is the most common misunderstanding. Converting MP3 to WAV does not undo the compression. What MP3 threw away stays gone. The conversion simply writes the sound that is left in a bigger container. The file becomes about ten times larger, holding exactly the same sound.
People sometimes hope that a WAV will sound better than the MP3 it came from. It will not. A WAV made from an MP3 sounds identical to the MP3. There is no extra detail, no extra warmth, no extra clarity: those were discarded when the MP3 was made, and no conversion can invent them.
Convert when a program needs WAV, not to improve quality
So the right reason to convert MP3 to WAV is that a program needs WAV, not that you want better sound. If a program accepts MP3, you gain nothing from converting, and you only make the file bigger. If a program insists on WAV, the conversion is exactly what you need.
If you want the best quality
If quality matters, go back to the source: the original CD, the lossless file or the studio master. A WAV or FLAC made from those is truly better than any MP3. A WAV made from an MP3 is only a bigger copy of it.
Titles, artist names and cover art are not carried over
Only the sound itself is read. Titles, artist names and cover art are not carried over, and WAV does not store them in the same way anyway. The WAV appears under its file name.
Why the file gets so big
An MP3 at 128 kilobits per second takes about one megabyte for each minute of sound. A 16-bit stereo WAV at the CD sample rate takes about ten megabytes for each minute, regardless of what is in it. That is roughly ten times larger. A four-minute song of four megabytes as MP3 becomes forty megabytes as WAV. A one-hour recording of fifty-five megabytes becomes around six hundred.
That is the price of the simplicity of WAV, and it is why you should convert only the files you need. Keep your collection as MP3 and convert to WAV only the clips or tracks that a particular program requires. Delete the WAV when you are done, if you like: you can always make another from the MP3.
What MP3 and WAV are
MP3 stores sound by analysing it, working out which details the ear is least likely to miss and discarding them, then packing what remains. That makes it small, and permanently lossy. WAV does no analysis and no discarding: it stores the sound as a plain series of measurements, thousands per second, which is why it is so large and why every program can read it. When you convert MP3 to WAV, you take the already-trimmed sound out of its compact packaging and lay it out flat, ready for software that wants it that way.
The two formats therefore sit at opposite ends of a trade: MP3 is the format for carrying and sharing, WAV is the format for working. They do not differ in what the sound contains after conversion; they differ in how it is stored. That is why a WAV made from an MP3 sounds the same as the MP3 and weighs much more.
Why editors like WAV
When a program edits compressed audio, it has to decode it, change it and encode it again, losing a little each time. With WAV there is nothing to decode and nothing lost when saving, so edits are fast and clean. That is why many audio and video editors insist on WAV, or convert to it internally: it is the safe format to cut, join, fade and process.
Using MP3 material in editing projects
If you are building a video, a podcast or a piece of music and some of your material arrives as MP3, converting it to WAV before you start gives your editor a clean, uniform set of files. You avoid the repeated decode-and-encode that some programs do behind the scenes, you avoid compatibility surprises, and you can edit without worrying that saving will cost you quality.
Keep in mind what the WAV is: a faithful container for the MP3's sound, not a restoration of the original. If the MP3 was low quality, the project will be built on low-quality material, whatever the container. Where you have a choice, ask for the original recording or a lossless file, and convert MP3 to WAV only for what you cannot get any other way.
Matching sample rates
Projects usually have a fixed sample rate, and files at other rates may be converted or rejected. The WAV made here keeps the MP3's own sample rate, so it matches the source exactly. If your project uses a different rate, your editor can resample on import, or you can adjust it there; the converter does not change the rate.
Sampling, loops and hardware
Samplers, drum machines and loop-based software often load WAV and nothing else. Producers who find a useful sound as an MP3 convert MP3 to WAV so they can load it. It works well for short sounds, such as a drum hit, a vocal phrase or a sound effect, where the file stays small even as WAV. For long tracks, the size becomes a consideration.
If you plan to use a sample in a release, check the rights to it, and remember that the quality ceiling is that of the MP3: loud, dense material may show the artefacts of compression, a faint swishing in the high frequencies, once it is heavily processed. For critical work, use the original source.
Trimming before converting
Since WAV files are large, trim the recording to the part you need before converting if you can. A ten-second sample that comes from a four-minute song is far better handled as a ten-second WAV than as a four-minute one. Many programs let you trim the MP3 first, though each trim re-encodes it, so for a clean result trim after converting.
How to convert MP3 to WAV here
Add your recording
Drop the MP3 onto the page or pick it from your device. It is read inside your browser and is not uploaded.
Convert
Press the button. The MP3 is decoded and written out as a WAV. A long recording takes a little longer, since all the work happens on your own device.
Download and use
Download the WAV and load it into the program that needed it. Check that the length is right and that it plays correctly.
Questions people ask before converting
Will the WAV sound better than the MP3?
No. The conversion does not undo the compression. What MP3 threw away stays gone, and the WAV holds exactly the same sound.
Why is the WAV so much bigger?
Because WAV is uncompressed. It stores every measurement of the sound, so it is about ten times larger than the MP3 it came from.
Why are the song titles missing?
Only the sound is read. Titles, artist names and cover art are not carried over.
Is my recording uploaded?
No. Everything runs in your browser and the recording never leaves your device.
Who converts MP3 to WAV
Video editors
Many video editors prefer WAV for voiceovers and music. Converting gets an MP3 into the timeline without trouble.
Musicians and producers
Samplers, drum machines and editing programs often want WAV, and converting lets an MP3 sample or loop be used there.
People making discs and presentations
Disc-burning and presentation software sometimes requires WAV. Converting makes the recording acceptable.
Common mistakes
Expecting better sound
A WAV made from an MP3 sounds the same as the MP3. Go back to the source for real quality.
Converting a whole library
The files become ten times larger. Convert only what you need.
Deleting the MP3
Keep the MP3. It is the compact original, and you can make another WAV from it at any time.
Related tools
To go the other way, convert WAV to MP3. If you want a lossless container for what remains, convert MP3 to FLAC, which is smaller than WAV. For other formats, MP3 to M4A and MP3 to OGG, and in the other direction M4A to MP3, FLAC to MP3 and OGG to MP3. If the audio belongs to a video, AVI to MOV and FLV to AVI change the video container.
When to convert MP3 to WAV, and when not to
Converting is right when a program, a device or a person requires WAV: an editor, a sampler, disc-burning software, a studio. It is the wrong move when you simply want better sound, since it cannot provide that, and wrong for a whole library, since the files become ten times larger. And it is unnecessary if the program you use accepts MP3 directly.
For the common cases, such as voiceovers, samples, clips for video and files for studios, it is quick, private and dependable to convert MP3 to WAV in the browser. Your original is never changed, so you can come back and convert MP3 to WAV again whenever you like.
Storage and speed
Because WAV files are large, check that you have room before you convert a long recording. An hour of stereo audio comes to roughly six hundred megabytes. The conversion runs on your own device, so very long recordings depend on its memory too, and a very long MP3 may be slow on an older phone. If it struggles, give the browser a moment and avoid switching to other apps while it works.
Do not convert in circles
Avoid chains such as MP3 to WAV to MP3. Each pass through MP3 discards more detail, and the WAV in the middle restores none of it. If you need the sound in several formats, make each from the best source you have, not from a copy of a copy.
Checking the result properly
After you convert MP3 to WAV, open the WAV in the program that needs it and play it through. Check that the length is right, that it starts and ends where it should and that both channels are present. If it behaves as expected, the job is done. If the program complains, check what sample rate and depth it expects and adjust there.
A simple routine to convert MP3 to WAV well
Check that the program really needs WAV. Keep the MP3 safe. Convert MP3 to WAV for only the files you need, load the result and check it plays correctly. When the project is finished, delete the WAVs you no longer need, since you can always make new ones from the MP3. This routine takes a couple of minutes, and it works whether you convert MP3 to WAV once a month or every day.
Your recording stays on your device
The conversion happens locally. Your recording is decoded by your own browser, written as a WAV there and handed back. Nothing is uploaded, so there is no copy on a server and no one else who could hear it. For unreleased music and private recordings, that is the safe way to convert MP3 to WAV.
A worked example
Say a friend sends you a voiceover as an MP3 of three minutes, and your video editor refuses it. You drop the file here and press the button. You download a WAV of three minutes and about thirty megabytes, which sounds exactly the same as the MP3. You load it into the editor, which accepts it without complaint, and place it on the timeline. The MP3 stays in your folder as the compact original.
Before you close the page
Check that you downloaded the WAV, that it plays and has the right length in the program that needs it, and that you kept the original MP3.
Summary
To convert MP3 to WAV here, drop the recording and press the button. The MP3 is decoded and written as an uncompressed 16-bit WAV, with the full length, the sample rate and both channels kept. This does not undo the compression: what MP3 threw away stays gone, and the file simply becomes about ten times larger, holding the same sound. Convert to WAV when a program needs WAV, not to improve quality. Titles, artist names and cover art are not carried over. Nothing leaves your device.