Audio Converter: Save as MP3, M4A, WAV or OGG
Change an audio file's format and bitrate without sending it anywhere. The work happens in this browser tab.
or drop it here
Accepts: MP3, M4A, AAC, WAV, OGG, Opus, FLAC
Converted on this device. Your files are never uploaded.
Lossless to lossy is a one-way trip
WAV and FLAC are lossless: FLAC is compressed, but it decodes back to exactly the same audio. MP3, AAC (M4A) and Opus are lossy and discard detail the ear is less likely to notice.
Going from FLAC or WAV to MP3 saves a lot of space. Going from MP3 to WAV makes the file several times bigger without restoring anything MP3 removed.
Choose the output by where it will play
MP3 plays almost everywhere, including car stereos and older players. M4A (AAC) is the native format on iPhone and Mac. OGG with the Opus codec handles speech and music well at low bitrates, but some older devices can't play it.
FLAC files can be opened and converted, but FLAC isn't offered as an output; to keep audio lossless, save as WAV. The list only shows formats your browser can encode, so the options can differ between browsers.
Worked example: what a bitrate change saves
A 4-minute song at 320 kbps is 320 × 240 ÷ 8 = 9,600 kB (9.6 MB); at 128 kbps it is 3,840 kB (3.84 MB).
The same song as uncompressed CD-quality WAV (44.1 kHz, 16-bit stereo = 1,411.2 kbps) is about 42.3 MB. As FLAC it gets smaller, since lossless compression can cut the size by up to 40–50%, but it stays far larger than MP3.
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Questions
Does converting MP3 to WAV improve quality?
No. The WAV holds the decoded MP3 exactly as it sounds now. It's useful when an editor or device requires WAV, not for better sound.
Can I save as FLAC?
No. FLAC files can be opened and converted to other formats, but FLAC isn't an output option. For lossless audio, save as WAV. OGG is hidden if your browser can't encode it.
What bitrate should I use for a podcast or voice memo?
Speech sounds fine at 128 kbps MP3, and Opus stays clear at even lower bitrates. Music benefits from 192 kbps or more.
What does “Keep original” mean?
When the output uses the same codec as the input, for example M4A to M4A, Keep original is offered and selected by default: the audio isn't re-encoded, so nothing is lost. Otherwise the default bitrate isn't set higher than the source: a 128 kbps file starts at 128 kbps, others at 192 kbps.
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