Audio Converter

Yes. It's free, needs no account and has no file limit beyond your device's memory. Files are not uploaded: WAV is created by your browser's Web Audio API, and other formats are encoded by FFmpeg running as WebAssembly inside the page. The only download is the engine itself, fetched once from a public CDN.

Add the WAV file, choose MP3 as the output format and pick a bitrate — 192 kbps is a good default for music, 128 kbps for speech. Press Convert. The first MP3 conversion downloads the roughly 31 MB engine; after that every file in the session converts without another download.

Yes. Drop an MP4, MOV, MKV, WebM or AVI file and choose any output format. The converter takes the first audio track and ignores the video stream. If the video has no audio track you'll see a clear 'No audio track was found' message instead of an empty file.

128 kbps is fine for podcasts and voice, 192 kbps is a solid default for music, and 256–320 kbps is close to transparent for most listeners. Higher bitrates give larger files: at 192 kbps one minute of audio is about 1.4 MB. Converting from a lossy file to a higher bitrate does not restore lost quality.

WAV is uncompressed PCM — exact, but about 10 MB per minute of CD-quality stereo. FLAC is lossless too, typically around half the size of WAV. MP3, AAC (M4A), Vorbis and Opus are lossy: they discard sounds you are unlikely to hear to make files 5–10 times smaller.

M4A (AAC) is the native format for iPhone, iTunes and Apple Music, and plays everywhere else too. MP3 is also supported. Opus and OGG Vorbis play in most browsers and Android apps but not in every Apple app, so for sharing with iPhone users M4A or MP3 is the safer choice.

It measures the loudest sample in the file (or in the trimmed part) and applies one fixed gain so that peak lands at −1 dBFS. Quiet recordings get louder and clipped-hot ones get slightly quieter. It does not compress dynamics or change the relative loudness inside the file.

Yes. Add multiple files and press Convert; they're processed one at a time with their own progress bar, so a large batch never freezes the page. When two or more files are done, Download all as ZIP packs them into one archive. The same settings and trim apply to the whole queue.

Formats other than WAV need FFmpeg, which is about 31 MB of WebAssembly. It downloads the first time you convert to MP3, M4A, OGG, Opus or FLAC, and your browser usually caches it for later visits. WAV output never needs it.

There is no fixed limit, but everything happens in browser memory. Audio files of a few hundred megabytes are usually fine on a desktop; very large videos can exhaust memory on phones. If a conversion fails with a memory error, trim the file or convert it on a computer.