Audio
Convert between audio formats and extract audio from video.
Audio converter
Convert an audio or video file to MP3, WAV, FLAC, OGG, Opus, or M4A.
MP3 to WAV converter
Decode an MP3 to uncompressed WAV for editing or mastering.
WAV to MP3 converter
Compress a large WAV recording to MP3 at a bitrate you choose.
FLAC to MP3 converter
Convert a lossless FLAC track to MP3 for players that cannot read FLAC.
Extract audio from video
Pull the soundtrack out of a video file and save it as audio.
About these tools
Convert between common audio formats and pull the audio track out of a video, using a WebAssembly build of FFmpeg that runs in your browser. The engine is a few megabytes and downloads the first time you use one of these tools, then converts everything locally.
This is the slowest category on the site, and honestly so: audio encoding is real work, and doing it on your device rather than on a server means your machine does that work. What you get in exchange is that recordings, interviews, and voice notes are never transmitted.
Frequently asked questions
- Can I really convert audio in a browser?
- Yes. FFmpeg is compiled to WebAssembly and runs inside the page. It is the same decoder and encoder set that desktop audio tools use, so the output is ordinary MP3, WAV, OGG, Opus, or FLAC that any player will open.
- How do I extract audio from a video?
- Use the video to audio tool, choose the video, and pick an output format. The video is decoded on your device and only the audio track is written out. Nothing about the video is uploaded, which matters for personal recordings.
- Why does the first conversion take longer?
- The audio engine has to download before the first conversion, because bundling several megabytes of WebAssembly into every page would slow down the whole site for people who never convert audio. After that it is cached and subsequent conversions start immediately.
- Does converting MP3 to WAV improve the quality?
- No, and no tool can. MP3 discarded detail when it was created, and decoding to WAV simply stores what remains in a lossless container: a bigger file with identical sound. Converting to WAV is useful for editing, not for quality.
- Which format should I choose?
- MP3 for maximum compatibility, Opus for the best quality per megabyte on modern devices, FLAC when you want lossless archiving, and WAV when a program insists on uncompressed audio. Each tool lists the bitrate presets it offers.
- Can I edit, trim, or normalise audio here?
- No. These are conversion tools, not an editor. Trimming, mixing, normalising, and noise removal are a different product, and adding a poor version of one would not serve anybody.
- How large a file can I convert?
- Up to 250 MB. The practical limit is memory and patience rather than the file size itself: a long recording takes real time to encode, and the page tells you what it is doing throughout.