Audio Converter Online - Convert Audio to WAV, MP3 & Opus

This converter turns any audio file your browser can play — MP3, M4A/AAC, OGG/Opus, FLAC, WebM, an existing WAV, and even AIFF in Safari — into your choice of three output formats: uncompressed 16-bit PCM WAV, MP3 at 320, 192, or 128 kbps, or WebM/Opus where the browser supports encoding it. It works by borrowing the browser's own media engine: decodeAudioData unpacks the compressed file into raw samples using the same battle-tested decoders that power the audio tag, and an OfflineAudioContext re-renders those samples at your chosen sample rate and channel count faster than real time. WAV output is written with a standards-correct RIFF header; MP3 is produced by a pure-JavaScript LAME encoder that loads on demand the first time you export; Opus is captured through the browser's MediaRecorder, so that option only appears when your browser can actually produce it. Which format should you pick? WAV whenever the destination refuses compressed audio or would re-encode it badly: audio editors, hardware samplers, IVR and telephony systems, video editors that want conformed audio, and archival storage. MP3 when you need small files that play absolutely everywhere — 320 kbps is transparent for almost all material, 192 kbps is the sweet spot for music sharing, and 128 kbps suits speech and podcasts. WebM/Opus gives the best quality per byte of the three but has narrower support outside browsers. One honest caveat: converting a lossy file to WAV or to a higher-bitrate MP3 does not restore quality. Lossy encoders discard information permanently; re-encoding a 128 kbps MP3 at 320 kbps only makes the file bigger, and each extra lossy generation loses a little more. FLAC is the exception — it is lossless, so FLAC to WAV is a perfect, bit-faithful unpacking. Sample rates deserve a moment. 44,100 Hz is the CD standard; 48,000 Hz is the video and broadcast standard used by virtually all film, TV, and modern interface hardware. Both capture the full range of human hearing per the Nyquist theorem. Pick 48,000 Hz for anything headed to video, 44,100 Hz for music distribution, or keep the original rate to avoid resampling entirely. The size estimator shows the cost in advance: uncompressed stereo at 44,100 Hz runs about ten megabytes per minute, while a 320 kbps MP3 is a predictable 2.29 MB per minute at any sample rate. Because everything happens locally, a whole album converts without a single byte leaving your machine — private, fast, and free of upload limits.