Free audio converter, no upload

Audio converter, MP3, M4A or WAV on your device

Turn a sound file into an MP3 that nearly every player opens, an M4A that stays small, or a WAV for editing. Pick the bitrate, convert all of it or one part, and keep the file on your device.

WAV, FLAC, M4A, OGG, OPUS, AAC and MP3 in
MP3 from 64 to 320 kbps, M4A or WAV out
Title, artist and cover art left behind

Drop a sound file to convert WAV, FLAC, M4A, OGG, OPUS, AAC or MP3, or a video for its sound. Converted on this device. Choose an audio file

How to convert an audio file

Open the file
Tap Choose an audio file. The tool names its format and bitrate, such as FLAC or Opus at 96 kbps.
Pick MP3, M4A or WAV
Then pick a quality: 192 kbps MP3 suits most music, 128 kbps M4A sounds about as good in less space.
Keep a part, if you like
Open Convert only part of the file and set a start and an end. Leave it closed to convert everything.
Download
Press Make the MP3, Make the M4A or Make the WAV, then Download.

Want to keep only part of it, or make it louder? Audio cutter or Increase video volume.

MP3, M4A or WAV: which to choose

MP3 is the safe choice for an old car stereo, a basic player or an app that asks for MP3. M4A holds AAC, which MDN describes as compressing more than MP3 with higher fidelity (MDN), so it sounds about as good at a lower bitrate. WAV is not compressed at all: every sample is stored, which suits editing but makes big files. Sizes per minute of stereo sound:

Output	Per minute	Per hour
MP3, 64 kbps	0.48 MB	28.8 MB
MP3, 128 kbps	0.96 MB	57.6 MB
MP3, 192 kbps	1.44 MB	86.4 MB
MP3, 320 kbps	2.4 MB	144.0 MB
M4A (AAC), 96 kbps	0.72 MB	43.2 MB
M4A (AAC), 128 kbps	0.96 MB	57.6 MB
M4A (AAC), 192 kbps	1.44 MB	86.4 MB
WAV, 44.1 kHz, 16-bit	10.58 MB	635.04 MB
WAV, 48 kHz, 16-bit	11.52 MB	691.2 MB

The setting to pick for common conversions

When you open a file, the tool shows its format and bitrate. Use that as your guide:

Converting	Pick	Why
WAV to MP3	192 kbps for music, 320 kbps to keep the most	WAV holds every detail, so the bitrate you pick is the only loss
FLAC to MP3	320 kbps	FLAC is lossless, so the highest MP3 setting keeps the most of it
M4A or AAC to MP3	The MP3 setting at or just above the bitrate shown	More than that only adds size
OGG or OPUS to MP3	At or above the bitrate shown, and 64 kbps for a voice recording	MP3 needs at least what the file has
MP3 to WAV	WAV	For an editor that asks for WAV; it sounds exactly like the MP3
MP3 to M4A	M4A at 128 kbps or more	For apps that prefer M4A; it cannot sound better than the MP3

What happens to each format

A file already in the format you pick is copied as it is, with nothing encoded again; anything else is decoded and encoded:

From	To MP3	To M4A	To WAV
WAV	Encoded by LAME	Encoded as AAC	Rewritten in its own PCM, such as 24-bit
FLAC	Encoded by LAME	Encoded as AAC	16-bit PCM
MP3	Copied as it is	Encoded as AAC	16-bit PCM
M4A or AAC	Encoded by LAME	Copied as it is	16-bit PCM
OGG or OPUS	Encoded by LAME	Encoded as AAC	16-bit PCM

Converting without losing quality

Some routes add no loss at all: MP3 to MP3 and AAC to M4A are copies, WAV to WAV keeps its own bit depth, such as 24-bit, and an MP3, M4A, OGG or OPUS file converted to WAV is decoded once and stored uncompressed. FLAC to WAV is written in 16-bit, so a 24-bit FLAC gives up its extra precision there.

Every other route compresses the sound. MP3, AAC, Opus and Vorbis all leave out detail to save space, and converting from one of them to another leaves out a little more, which no bitrate can bring back. Pick a bitrate at or above the file's own; a higher one only makes the file bigger. From WAV or FLAC there is nothing lost yet, so the bitrate you pick is the only loss.

Sample rates, channels and surround sound

The MP3 keeps the sample rate of the file, such as 44.1 or 48 kHz. M4A is written at 44.1 or 48 kHz, which every browser's AAC encoder takes, so a 22.05 kHz file comes out at 44.1 kHz. A mono recording stays mono, and surround sound (5.1) is mixed down to stereo: in our test a 5.1 AAC file became a stereo MP3 in under a third of a second.

WAV made from an MP3, AAC, Opus, Vorbis or FLAC file is 16-bit; WAV made from WAV keeps the depth it had.

Convert only part of a file

Open Convert only part of the file under the player to set a start and an end. Only that part is decoded and encoded, which saves time and space with long recordings such as lectures or meetings. For fades or an Android ringtone, use the audio cutter instead, and for an iPhone ringtone the iPhone ringtone maker.

No daily limit, and big WAV files

There is no account, no daily cap and no size cap from a server; files are converted one at a time, as many as you like. The new file is held in memory until you download it. Compressed files stay small: an hour of MP3 at 192 kbps is 86.4 MB. WAV is the one to watch: an hour of 44.1 kHz stereo WAV is about 635 MB, more than a phone may hold, so convert a long recording to WAV in parts.

Files it opens, and files it cannot

Besides sound files, it opens MP4, MOV, WebM and MKV videos and converts their sound; for that job, video to MP3 also saves the original sound as M4A. Windows Media Audio (WMA), AMR recordings from older phones, and files with copy protection cannot be opened here; the tool says so as soon as you choose one. Dolby Digital (AC-3) sound, which some videos carry, converts only in browsers that can decode it on your device. A WhatsApp voice message is an Opus file and converts like any other; WhatsApp audio to MP3 shows how to get it out of the app and starts at a bitrate that suits a voice.

Converting is done by your own device: the file is never uploaded, and the new file has no title, artist, album, cover art or comment from the original.

Which browsers can do it

Converting needs sound decoding on the device (WebCodecs): Chrome and Edge from version 94, Firefox on computers from 130, Samsung Internet from 17 and Safari from 26 (caniuse). MP3 to MP3 and AAC to M4A are copies, so they work without it. LAME writes the MP3s; for M4A, browsers without an AAC encoder of their own load FFmpeg's.

Questions

How do I convert WAV to MP3?

Open the WAV, leave MP3 selected, choose 192 kbps for music or 128 kbps for speech, then press Make the MP3 and Download.

Does converting FLAC to MP3 lose quality?

Some. FLAC keeps every sample and MP3 leaves out detail to save space; 320 kbps keeps the most. To skip MP3 compression altogether, choose WAV, which is much bigger.

Can I convert M4A to MP3?

Yes. Open the M4A and press Make the MP3. Choose a bitrate at or above the M4A's own, which the tool shows when you open it.

Will converting MP3 to WAV improve the sound?

No. A WAV holds the MP3's sound exactly, uncompressed, so it is much bigger but sounds the same. It helps when an editing app wants WAV.

Can I convert several files at once?

Not yet: one file at a time. In our test a 40-second WAV became an MP3 in under a second, so a song takes a few seconds.

Is it free with no limit?

Yes. There is no account, no daily cap and no watermark. A very long WAV can be too big for a phone to hold, so convert those in parts.

Are the title and cover art kept?

No. The new file is written without tags, so the title, artist, album, comments and cover art of the original are left behind.

Sources: MDN, Web audio codec guide, caniuse, WebCodecs API, Mediabunny, MP3 encoder extension, Mediabunny, AAC encoder extension

Open-source code this tool runs on your device: Mediabunny (MPL-2.0), unmodified, reads and writes the video and audio files; LAME (LGPL, source at SourceForge), the MP3 encoder (version 3.100), built without its decoder for the browser by @mediabunny/mp3-encoder (MPL-2.0) and loaded only when the new file is an MP3; FFmpeg AAC encoder (LGPL-2.1 or later, source at ffmpeg.org), built without any GPL part for the browser by @mediabunny/aac-encoder (MPL-2.0), loaded only where the browser has no AAC encoder of its own.