Audio Format Converter
Convert audio or the sound from video into MP3, AAC, WAV, FLAC, OPUS and more. Adjust bitrate, sample rate and channels locally in your browser—files never upload.
$Drag & drop audio or video here, or click to browse
Convert sound from video, or convert MP3, WAV, M4A, FLAC, OGG and other audio files
Upload audio or video with sound; files stay local
Pick format, bitrate, sample rate and channels
FFmpeg WASM encodes in your browser
Preview the result and save it locally
Audio Format Converter Online Free
Local · No uploadsConvert audio, or the sound from video, into MP3, AAC, M4A, WAV, FLAC, ALAC, OGG, OPUS, WMA, AIFF, and AC3. Adjust bitrate, sample rate, and channels in your browser. Powered by FFmpeg WASM—no installation and no upload.
Quick Answers
- The converter supports MP3, AAC, M4A, WAV, FLAC, ALAC, OGG, OPUS, WMA, AIFF, AC3, CAF, and MKA. Lossy formats support 64–320 kbps; lossless formats do not use a bitrate.
- Video input keeps only its audio track because the command uses -vn. FFmpeg WASM processes files in your browser, so source and output files never upload.
How to Convert Audio
- 1
Upload an audio file or video with sound
- 2
Choose MP3, AAC, WAV, FLAC, OPUS, or another format
- 3
Adjust bitrate, sample rate, and channels if needed
- 4
Convert locally, then download the audio
Common Uses
- Turn lectures, interviews, and meetings into easy-to-play MP3 files
- Prepare WAV, FLAC, or AIFF lossless assets for editing software
- Save video sound as OPUS, OGG, or M4A to reduce file size
Conversion Limits
- Rare codecs depend on the decoder allowlist in the browser FFmpeg build
- WAV, FLAC, ALAC, and AIFF files are much larger than lossy audio
- MKA stream-copies the source codec and changes only the container
- Large files are limited by available browser memory
Choosing an Audio Converter
- vs. desktop FFmpeg: no install and visual controls, with FFmpeg doing the actual conversion
- vs. upload-based tools: files stay on your device, making it private and faster
- vs. single-purpose MP3 converters: 13 output types cover lossy, lossless, and copy-to-container workflows
How Audio Conversion Works
- The page probes the input, confirms an audio stream, and drops video with -vn. Output then uses libmp3lame, libopus, libvorbis, AAC, FLAC, or PCM as selected.
- Bitrate controls the lossy size/quality tradeoff, while -ar and -ac normalize sample rate and channels for podcast, voice, or editing workflows.
- MKA uses -c:a copy to remux the original audio into a Matroska container—fast and without another generation loss.
Audio Conversion FAQ
What output formats are supported?
MP3, AAC, M4A, WAV, FLAC, ALAC, OGG, OPUS, WMA, AIFF, AC3, CAF, and MKA. Video input is accepted when it contains an audio track.
Does conversion upload my file?
No. FFmpeg WASM converts locally in your browser; neither the source nor the result is uploaded.
What bitrate should I use?
Use 192–320 kbps for music and 96–128 kbps for podcasts or voice. Choose FLAC, ALAC, or WAV for lossless output.
Why is WAV much larger than MP3?
WAV stores uncompressed PCM samples. MP3 uses lossy compression to discard less-audible data, so it is smaller but not reversible.
What is the difference between MKA and FLAC?
MKA is a container that can stream-copy the original codec. FLAC is a lossless codec that re-encodes, usually shrinks the file, and preserves the decoded signal exactly.