Audio Converter: MP3, WAV, M4A, FLAC, OGG & Opus
A free audio converter for every common format: turn any audio file, or the soundtrack of a video, into MP3, M4A (AAC), WAV, FLAC, OGG or Opus. Set the bitrate for lossy formats or the bit depth for lossless ones, change the sample rate or mix to mono, and convert a whole batch in one go. The files are converted on your device, so nothing is uploaded.
- Runs on your device
- WebCodecs · GPU
- FFmpeg
- Works offline
Updated
Drop your videos or audio files here
How to convert audio files
Step 1: Drop your audio or video files on the box above. Different formats can share one batch.
Step 2: Choose the format under Convert to.
Step 3: Set Bitrate for MP3, M4A, OGG or Opus, or Bit depth for WAV and FLAC. Sample rate and channels are under Advanced settings.
Step 4: Press Convert and download each file, or all of them as a ZIP.
Good to know
Settings explained
- Bitrate
- 128 kbps is fine for speech, 192 kbps for music, 320 kbps is the MP3 maximum.
- OGG codec
- Godot, Unity and older players need Vorbis. Vorbis uses the FFmpeg engine (≈31 MB, downloaded once).
- Opus: Smaller
- Vorbis: Games, older players
Formats
Batch-friendly: add many files and they are processed one after another — if one fails, the rest still finish.
How it runs
- Hardware video engine
- Video is decoded and encoded by your device’s media hardware through WebCodecs — usually several times faster than real time.
- FFmpeg (when needed)
- Older formats and a few filters use FFmpeg compiled to WebAssembly. It downloads once (about 31 MB) the first time it is needed and is cached for offline use.
Which audio format should you convert to?
Pick by where the file is going. MP3 plays on everything. M4A (AAC) sounds a little better at the same size and suits Apple devices. WAV and FLAC are lossless for editing and archiving, FLAC at a much smaller size. Opus is the most efficient for speech and the web, and OGG Vorbis is what many game engines import.
| Format | Type | Settings | Channels | Best for |
|---|---|---|---|---|
| MP3 | Lossy | 64–320 kbps | Up to 2 | Maximum compatibility |
| M4A (AAC) | Lossy | 64–320 kbps | Up to 2 | Apple Music, iPhone, video soundtracks |
| WAV | Lossless, uncompressed | 16- or 24-bit | Up to 8 (5.1, 7.1) | Editing, DAWs, CDs, broadcast |
| FLAC | Lossless, compressed | 16- or 24-bit | Up to 8 | Archiving music at full quality |
| OGG | Lossy: Opus or Vorbis | 64–320 kbps | Opus up to 2, Vorbis keeps 5.1 | Games (Vorbis), Linux, the web |
| Opus | Lossy | 64–320 kbps, always 48 kHz | Up to 2 | Voice, podcasts, smallest files |
Can you convert audio without losing quality?
Yes, between lossless formats. WAV, FLAC and AIFF all store the exact samples, so converting between them loses nothing: choose WAV or FLAC and keep the bit depth at least as high as the source (24-bit for 24-bit masters). The sample rate stays the same unless you change it.
Any conversion to MP3, M4A, OGG or Opus is lossy, and any conversion from them keeps their loss. Converting an MP3 to WAV or FLAC does not improve quality; it only makes the same sound bigger, as MP3 to WAV explains. Converting one lossy format to another adds a small extra loss, so use a bitrate at least as high as the source.
Which format has the best quality?
For pure quality, WAV and FLAC tie: both are lossless and sound identical. FLAC is the better choice for storage because it is typically half to two-thirds the size and carries tags properly; WAV is the safer choice for editors and hardware that do not read FLAC.
Among lossy formats at the same bitrate, Opus and AAC generally beat MP3, and the gap matters most below 128 kbps. Above 192 kbps all three are very hard to tell from the original for most music.
Converting to one specific format?
These pages run the same converter with the right format and defaults already set, plus answers for that pair.
- To MP3 from anything: the MP3 converter, or WAV to MP3, M4A to MP3 and FLAC to MP3.
- To WAV for editing: MP3 to WAV, M4A to WAV and OGG to WAV.
- For games: MP3 to OGG and WAV to OGG write OGG Vorbis.
- For Apple apps: MP3 to M4A.
- Smaller files rather than a new format: the audio compressor.
Why use this audio file converter
- Private. Files are decoded and encoded in your browser; there is no server copy of your music or recordings.
- Batch and mixed. Convert a folder of WAV, M4A and FLAC files to one format in a single run.
- Tags kept. Title, artist, album and cover art from MP3, M4A and FLAC sources are carried over where the target format can store them.
- Old formats too. WMA, AMR, AC-3 and AIFF are read; the rarer ones use an FFmpeg engine that downloads once and is cached.
- No limits. No file-size cap, daily quota, sign-up or watermark.
Convert audio on iPhone, Android or a computer
The converter is a web page, so it works the same in Safari on an iPhone, Chrome on Android and any desktop browser. On phones, tap the drop zone to pick files from Files, Downloads or your recorder app; on computers, drag them in. Converted files are saved to your Downloads folder. Very long recordings are easiest on a computer, where there is more memory.
Tips & troubleshooting
Not sure what is inside a file? Media info shows its codec, sample rate, channels and bitrate before you convert.
Need exact specs such as VBR MP3 or new tags? The audio bitrate converter has CBR/VBR and tag fields.
Video file? The converter takes its soundtrack directly, but extract audio from video is tuned for that job.
For maximum compatibility in old car stereos, convert to MP3 at 44.1 kHz and 192 kbps.
Audio Converter FAQ
How do I convert an audio file to MP3?
Drop the file here, choose MP3 under Convert to, keep 192 kbps (or pick another bitrate) and press Convert. The dedicated MP3 converter does the same with MP3 already selected.
Does converting MP3 to WAV or FLAC improve quality?
No. Lossless formats preserve exactly what they are given, but they cannot restore the detail an MP3 already removed. The file gets larger and sounds the same.
Can I convert many audio files at once?
Yes. Drop as many as you like, even in different formats. They are converted one after another with the same settings; if one fails, the rest still finish, and Download all gives you a ZIP.
Is it safe to use an online audio converter?
With this one, your files never leave your device: the conversion runs in your browser, so there is no upload for anyone to keep or analyse. Upload-based converters, by design, receive a copy of every file you convert.
Can I convert audio on an iPhone or Android without an app?
Yes. Open this page in Safari or Chrome, tap the drop zone, pick the files and press Convert. The converted audio is saved to Downloads; no app or account is needed.
Which format should I choose for a voice recording?
For sharing, MP3 or M4A at 64–128 kbps mono is plenty. For the smallest file, Opus at 64 kbps sounds clear. For transcription services or editing, WAV at 16-bit is the safest.