MP3
Best for sharing and broad device compatibility.
Free Audio Converter - Convert MP3, FLAC, WAV, M4A and OGG Online
AudioCraft
Free Audio Converter
Convert MP3, FLAC, WAV, M4A, OGG and extract audio from video files locally in your browser.
Your files stay on this device. Nothing is uploaded to a conversion server.
Browser-local conversionNo upload requiredVideo to audioMulti-format output
Drop audio or video files hereAdd audio tracks or videos, choose an output format, then convert them one by one.
Output format
Auto detectMP3
Engine not loaded
Best for small batches. Very large audio or video files may exceed browser memory.
The conversion engine loads on first use, then runs offline in this page.
Powered by FFmpeg WebAssembly (GPL-2.0-or-later).
Which format should I choose?
M4A / AAC
Good quality and smaller files for Apple devices.
FLAC
Use when you want lossless music archives.
WAV
Use for editing or uncompressed audio workflows.
OGG / Opus
Open formats with efficient compression.
Video to audio
Extract audio tracks from MP4, MOV, MKV, WebM and other video files.
Popular audio conversions
FLAC to MP3
Create smaller files for sharing while keeping your original lossless tracks.
M4A to MP3
Convert Apple audio files for broader device compatibility.
WAV to FLAC
Compress uncompressed audio without losing quality.
OGG to MP3
Make open-format audio easier to play on more devices.
MP3 to WAV
Prepare audio for editing workflows that prefer uncompressed files.
MP4 to MP3
Extract the audio track from a video and save it as a regular music file.
Audio Format Comparison
| Format | Quality | File Size | Compatibility | Best for |
|---|---|---|---|---|
| MP3 | Lossy | Small | Universal | Sharing, streaming, broad playback |
| M4A / AAC | Lossy | Small | Apple + most players | iPhone, Apple Watch, iTunes |
| FLAC | Lossless | Large | Good | Hi-Res archives, audiophile libraries |
| ALAC | Lossless | Large | Apple devices | Lossless on iPhone / Apple Music |
| WAV | Lossless | Very large | Universal | Audio editing, production |
| OGG | Lossy | Small | Limited | Open-source apps, web audio |
Frequently Asked Questions
No. All conversion runs locally in your browser using WebAssembly. Your files never leave your device.
The browser downloads the FFmpeg WebAssembly engine (~31 MB) on first use. It is cached afterwards for much faster conversions.
Input: MP3, FLAC, WAV, M4A, OGG, Opus, AIFF, ALAC, WMA, AMR, AC3. Output: MP3, M4A/AAC, WAV, FLAC, OGG, Opus, AIFF, ALAC.
Yes. Add MP4, MOV, MKV, WebM, AVI and other video files, choose an audio output format, and the converter will keep the audio stream only.
M4A (AAC) offers near-MP3 file sizes with better sound quality and native iOS support. ALAC is the lossless option if you want perfect quality.
Yes. Choose FLAC or ALAC as output for lossless (zero-quality-loss) conversion. MP3 and AAC are lossy but produce much smaller files.
Files up to 1 GB are supported. Very large audio or video files may slow down or exhaust browser memory on some devices.
Use OnePlayer: it supports all formats above, imports via Wi-Fi, AirDrop or USB, and plays music offline on both iPhone and Apple Watch.
Yes, completely free with no sign-up required. Everything runs in your browser.