How to convert audio files to MP3 or WAV
- Drop one or more audio files into the box, or click to browse. You can keep adding files to the list.
- Choose the output format: MP3 with a bitrate from 96 to 320 kbps, or lossless WAV.
- Optionally set Channels to Mono or Stereo and pick a sample rate such as 44.1 kHz or 16 kHz.
- Click Convert. A single file downloads directly; several files download together as converted-audio.zip.
What you can do with Audio Converter
- Batch conversion
- Convert a whole set of tracks in one pass. Each file shows its status and new size, and you can download files individually.
- Common input formats
- Reads MP3, WAV, M4A, AAC, FLAC, OGG, Opus, WebM, AIFF and more, depending on what your browser can decode.
- MP3 bitrate choice
- Encode MP3 at 96, 128, 192, 256 or 320 kbps with the LAME encoder, running locally in JavaScript.
- Sample rate conversion
- Resample to 48, 44.1, 32, 22.05, 16, 11.025 or 8 kHz, for example 16 kHz for speech recognition or 8 kHz for phone systems.
- Mono downmix
- Mix stereo down to mono to halve the size of a WAV file, or force stereo output for players that expect two channels.
- One ZIP download
- Multiple converted files are packed into a single ZIP archive, with duplicate file names numbered automatically.
Choosing a bitrate, format and sample rate
Choose MP3 for sharing and playback and WAV for editing. MP3 at 128 kbps is fine for speech and podcasts, 192 kbps is a good default for music, and 320 kbps is the highest MP3 bitrate, close to transparent for most listeners. WAV here is 16-bit PCM, the same resolution as a CD, and uses about 10 MB per stereo minute at 44.1 kHz. Converting a lossy file such as M4A or OGG to WAV won't restore lost detail; it only makes the file easier to edit or import into older software.
44.1 kHz is the standard for music and 48 kHz for video. Lower rates shrink the file but also remove the highest frequencies: a 16 kHz file only keeps sound up to 8 kHz, which is fine for voice but dull for music. Conversion decodes the audio to raw samples, so ID3 tags, album art and chapter markers from the original are not copied to the new file. If your browser can't decode a format, such as WMA, that file is marked as an error and the rest of the batch continues.
Frequently asked questions
Does this audio converter upload my files?
No. Every file is decoded and re-encoded inside your browser tab with the Web Audio API and a JavaScript MP3 encoder. Nothing is sent to a server, so conversion speed depends on your device rather than an upload queue, and private audio stays private.
Can I convert to M4A, FLAC or OGG?
Not currently. The converter outputs MP3 or 16-bit WAV, which open in virtually every player, editor and phone. It accepts M4A, FLAC, OGG, WebM and other formats as input, so it suits jobs like FLAC to MP3, M4A to MP3 or WAV to MP3.
Will converting WAV to MP3 lose quality?
MP3 is lossy, so some data is discarded, but at 192 or 320 kbps most people can't hear a difference on typical speakers or headphones. Going the other way, MP3 to WAV keeps the quality the MP3 already had while making the file much larger.
How many files can I convert at once?
There's no set limit. Files are processed one after another, so a large batch simply takes longer. Each file is held in memory while it converts, so very long recordings may be slow on a phone. Files that fail to decode are flagged and skipped.
Does the converter keep tags and album art?
No. ID3 tags such as title, artist and cover art are not carried over, because the audio is decoded to raw samples and encoded fresh. Add tags afterwards in a music library app or a tag editor if you need them.