Audio Converter
Convert audio, or the sound of a video, to WAV or MP3 at 64 to 320 kbps, in mono or stereo at 22.05 to 48 kHz. Files up to 100 MB and 10 minutes. How it works
Use the Audio Converter
Upload Audio File
Drag & drop or click to browse
Any format your browser can decode, such as MP3, OGG, AAC or WebM. A video file (MP4, MOV, WebM) works too: only its audio track is converted.
The file is read and converted in your browser. This page does not upload it to any server.
About the Audio Converter
A 3-minute stereo recording at 44.1 kHz is 30.28 MB as WAV and 2.75 MB as a 128 kbps MP3, about 11 times smaller. This audio converter decodes an audio file, or the sound track of a video, in your browser and writes it as 16-bit WAV or as MP3 at 64 to 320 kbps, in stereo or mixed down to mono, at the original sample rate or 22.05, 44.1 or 48 kHz. MP3 throws away detail to save space: 128 kbps is fine for speech, and 192 kbps or more is the usual pick for music.
WAV size by duration, sample rate and channels
| Duration | 44.1 kHz stereo | 44.1 kHz mono | 48 kHz stereo | 48 kHz mono |
|---|---|---|---|---|
| 1 minute | 10.09 MB | 5.05 MB | 10.99 MB | 5.49 MB |
| 3 minutes | 30.28 MB | 15.14 MB | 32.96 MB | 16.48 MB |
| 10 minutes | 100.94 MB | 50.47 MB | 109.86 MB | 54.93 MB |
Seconds × sample rate × channels × 2 bytes, with 1 MB = 1,048,576 bytes and the 44-byte header left out, as the converter’s size estimate counts it. The page shows this estimate for the channels and sample rate you choose.
MP3 size by bitrate and duration
| Bitrate | 1 minute | 3 minutes | 4 minutes | 10 minutes |
|---|---|---|---|---|
| 64 kbps | 0.46 MB | 1.37 MB | 1.83 MB | 4.58 MB |
| 96 kbps | 0.69 MB | 2.06 MB | 2.75 MB | 6.87 MB |
| 128 kbps | 0.92 MB | 2.75 MB | 3.66 MB | 9.16 MB |
| 192 kbps | 1.37 MB | 4.12 MB | 5.49 MB | 13.73 MB |
| 256 kbps | 1.83 MB | 5.49 MB | 7.32 MB | 18.31 MB |
| 320 kbps | 2.29 MB | 6.87 MB | 9.16 MB | 22.89 MB |
The “Est. size” the page shows after you choose a bitrate: seconds × kbps × 1000 ÷ 8, in MB of 1,048,576 bytes. The real file differs a little.
How to use this tool
- Choose an audio file, or a video whose sound you want, of up to 100 MB and 10 minutes. Any format your browser can decode works, such as MP3, OGG, AAC, WebM, MP4 or MOV.
- Check the sample rate, channels and duration the page reads, and press play to hear the file.
- Choose WAV or MP3 and, for MP3, a bitrate. Keep the channels and sample rate, or mix down to mono and pick 22.05, 44.1 or 48 kHz, then read the estimated size.
- Press Convert to MP3 or Convert to WAV, then Download. The file is named converted_ followed by the original name, with .wav or .mp3.
Frequently asked questions
- How do I convert WAV to MP3?
- Choose the WAV file, select MP3, pick a bitrate from 64 to 320 kbps and press Convert to MP3. The estimated size is shown before you convert: 3 minutes of audio at 128 kbps is about 2.75 MB, against about 30 MB as stereo WAV.
- How do I convert MP3 to WAV?
- Choose the MP3 file, select WAV and press Convert to WAV. The result is 16-bit PCM at the sample rate your browser decoded the file to. It is larger than the MP3 and does not restore what the MP3 discarded.
- Can it extract the audio from a video?
- Yes. Choose a video such as MP4, MOV or WebM and only its sound track is decoded and written as WAV or MP3; the picture is dropped. Audio opens in any format your browser decodes, such as MP3, OGG, AAC or WebM, and the list depends on the browser. Output is WAV or MP3 only, not FLAC, OGG, AAC or M4A.
- Why is the sample rate not the same as my file’s?
- The browser resamples decoded audio to the rate of its audio output. MDN states that the decoded buffer is resampled to the AudioContext’s sampling rate, so a 44.1 kHz file can show 48,000 Hz on a 48 kHz device. Keep writes the rate shown; choose 44.1 kHz to write the file at 44,100 Hz again.
- Is my audio file uploaded?
- The file is read and converted in your browser, and this page does not upload it to a server. The MP3 encoder runs in a background worker and is loaded from this site.
- Why was my file rejected?
- Files over 100 MB, audio longer than 10 minutes and files too large to decode in memory are refused with a message: “Audio files can be at most 100 MB.”, “Audio duration must be longer than 0 seconds and at most 10 minutes.” or “This audio file is too large to decode safely.” A file other than a WAV is refused above 64 MB, because it can grow about eight times when decoded; for a video the message says so. A stereo WAV hits the size limit first: at 44.1 kHz, 100 MB holds about 9 minutes 54 seconds, so a 10-minute WAV (105,840,044 bytes) is refused.
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