About Convert Audio
Convert audio files between formats (MP3, WAV, FLAC, AAC, OGG, M4A) with control over bitrate, sample rate, and channels.
How convert audio works
Audio formats fall into three camps: lossy (MP3, AAC, OGG, Opus) for small files with slight quality loss; lossless (FLAC, ALAC) for archival quality at larger sizes; and uncompressed (WAV, AIFF) for huge files of raw samples. Converting between them is straightforward, but the right choice depends on what you’re doing next.
NextConvert encodes lossy formats at near-transparent bitrates by default (320 kbps MP3, 256 kbps AAC) so the difference from the source is inaudible. For lossless conversions we copy the audio sample-perfectly. Only the container changes. For sample-rate or channel changes (44.1 to 48 kHz, stereo to mono), we use high-quality resampling that preserves transient detail.
Common conversions: FLAC to MP3 to fit a music library on a phone, WAV to AAC for podcast publishing, MP3 to WAV to edit in a DAW that doesn’t handle compressed input, M4A to MP3 for compatibility with older players.
When to use it
Music library compression
Convert a FLAC / WAV collection to MP3 at 320 kbps to fit on a phone or tablet.
Podcast distribution
Convert WAV master files to AAC or MP3 at the right bitrate for podcast platforms.
DAW import
Convert compressed audio to WAV for editing in Logic, Ableton, or Pro Tools.
Legacy device support
Convert M4A or Opus to MP3 for older car stereos and MP3 players.
Supported formats
Input
Output
Step-by-step guide
- 1
Upload the audio
Drop any common audio file in.
- 2
Choose format and quality
Pick output format, bitrate (for lossy), and optionally sample rate or channels. We default to sensible high-quality settings.
- 3
Convert and download
We produce the new file and stream it back. Original is unchanged.
Tips for the best result
- 320 kbps MP3 is essentially transparent for music. Going higher just makes files bigger without audible improvement.
- For voice (podcasts, audiobooks), 96 to 128 kbps mono is plenty. You save half the file size compared with stereo, with no perceptual loss.
- If you’re archiving a collection, encode lossless once (FLAC) and convert to lossy on demand later. Never the other way around.
Privacy and security
Files are uploaded to our processing servers over an encrypted connection and removed automatically after the job completes (usually within a few hours). We never share your media or train models on it. You can also delete a job manually at any time from your dashboard.
Read our full privacy policy for retention timelines and our list of subprocessors.