Convert audio files to MP3 and more
Convert M4A, OPUS, OGG, WAV, WebM, FLAC and more to MP3, WAV, M4A or OGG.
How it works
Every app has its own favourite audio format: WhatsApp voice notes are OPUS, iPhone voice memos are M4A, browser recorders produce WebM, and Windows sound recorder makes WAV. MP3 is the one format that every phone, car stereo, transcription service and upload form accepts. This converter turns any of them into MP3, M4A, OGG or WAV.
Conversion uses FFmpeg running as WebAssembly in your browser. Choosing a bitrate is the only decision for lossy targets: 64 kbps for speech, 128-192 kbps for music. WAV is uncompressed (about 10 MB per minute) and only worth choosing when an editor or transcription service demands it.
Which output format to pick
| Format | Compression | Size per minute | Choose it for |
|---|---|---|---|
| MP3 | Lossy | 960 KB at 128 kbps | Anything that must play everywhere: car stereos, upload forms, podcasts |
| M4A (AAC) | Lossy, more efficient than MP3 | 960 KB at 128 kbps | Apple devices, and better quality than MP3 at the same size |
| OGG (Vorbis) | Lossy | 960 KB at 128 kbps | Games, Linux software and web apps that ask for OGG |
| WAV | None (uncompressed) | About 10.6 MB (44.1 kHz stereo) | Audio editors and services that insist on WAV |
Converting between lossy formats never adds quality back; choose the bitrate for the listener, not higher than the source.
How to use it
- Drop the audio file (MP3, M4A, AAC, OPUS, OGG, WAV, WebM, FLAC, WMA, AMR) or click to browse.
- Choose the output format; MP3 is the safe default.
- For lossy targets pick a bitrate. Voice recordings can use 64 kbps.
- Click Convert, then download the file.
Frequently asked questions
Which format should I use for a transcription service?
Most accept MP3 and M4A; some prefer WAV. MP3 at 64-96 kbps mono is small and perfectly adequate for speech recognition.
Does converting to WAV improve quality?
No. WAV stores the decoded audio uncompressed, but what was lost in the original lossy file does not come back. Use WAV only when an application requires it.
Are tags (title, artist, cover art) kept?
No. Metadata is stripped so no personal information travels with the file. Add tags afterwards in your music app if you need them.
Related tools
- OPUS to MP3Convert WhatsApp voice notes (.opus, .ogg) to MP3 you can play or share anywhere.
- M4A to MP3Convert iPhone voice memos and Apple Music M4A/AAC files to MP3 locally.
- Video to MP3Extract the audio track of an MP4, MOV or WebM as an MP3, entirely on your device.
- Video TrimmerCut a clip out of a video by start and end time, without re-encoding when possible.
- Audio CutterCut a part of an MP3, M4A, WAV or other audio file on a waveform, with fade in and fade out.
- Audio to Text (Speech to Text)Transcribe MP3, M4A, WAV, OGG and voice notes to text on your device with Whisper. Timestamped, editable, exportable. Nothing is uploaded.