mp3 converter
turn almost any audio or video file into an mp3 that plays on every device.
runs on your device · free · no sign-up
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how to mp3 converter
- drop your audio file on the box above, or choose it from your device.
- set the bitrate, and tick mono for voice recordings.
- optionally trim with the sliders or add a fade, and check the expected size.
- press convert to mp3 and download the result.
mp3 plays everywhere, which is why people keep converting to it, but it is a lossy format. size follows bitrate times length: 128 kbps is about 1 mb per minute, 192 kbps 1.4 mb, 320 kbps 2.4 mb. choose by where it will be played, not by the biggest number.
when converting from another lossy format such as m4a or ogg, you are compressing twice. use a bitrate at least as high as the original (192 or 256) to keep the loss small. when converting from wav or flac, any bitrate works, and 192 to 256 is a sound default.
voice recordings such as interviews, podcasts and memos rarely need stereo. mono at 64 to 96 kbps gives intelligible, small files, which is ideal for emailing or putting on a website.
features
- bitrate from 64 to 320 kbps and an expected size shown before converting
- mono option and sample rate choice
- trim with start and end sliders and a looping preview
- volume change and fade in and out
- private: converts in your browser, no upload and no limits on the number of files
popular uses
frequently asked questions
what bitrate is best?
192 kbps suits most music; 128 kbps is fine for speech; 320 kbps is the maximum quality.
what does mono do?
it mixes both channels into one, roughly halving the file size. good for voice recordings and podcasts.
is it really private?
yes, conversion runs locally in your browser tab.
can i convert only part of a file?
yes. drag the start and end sliders, listen with preview selection, and only that part is saved as mp3. add a one second fade to avoid clicks.
why does the mp3 sound worse than my flac or wav?
mp3 throws away detail to save space. at 256 or 320 kbps the difference is hard to hear, but at 96 kbps it is clear. start from the original lossless file rather than another mp3 to avoid stacking losses.
which input formats are supported?
wav, m4a, aac, ogg, opus, flac, wma and the audio of most video files. if a file will not load, check that it plays in the preview above.