Free Audio Converter

For MP3 output you can pick 128, 192, 256, or 320 kbps. 128 kbps produces the smallest files and is fine for speech, podcasts, and casual listening. 192 and 256 kbps are good general-purpose choices that balance size and quality for music. 320 kbps is the highest MP3 quality and the largest file, worth it when you want the best MP3 fidelity. If you are unsure, 192 kbps is a sensible default.

Choose MP3 when you want a small, widely compatible file for sharing, streaming, or uploading, since MP3 uses compression to keep the size down. Choose WAV when you need uncompressed audio for editing, mastering, or feeding into another tool that expects raw PCM, since WAV keeps every sample but produces much larger files. In short: WAV for editing quality, MP3 for size and portability.

No, and this is a common misconception. MP3 is a lossy format, so some audio detail was permanently discarded when the MP3 was first created. Converting that MP3 to WAV produces a larger, uncompressed file, but it cannot recover the detail that lossy compression already removed. It only prevents any further quality loss from happening in later steps. If you need genuine high quality, start from an original WAV or a lossless source.

MP3 encoding uses lamejs, which is the well-known LAME MP3 encoder ported to pure JavaScript so it can run in the browser. It runs entirely on your device with no server involved. WAV encoding does not need a library at all: the tool writes standard 16-bit PCM WAV natively in JavaScript. You can review the lamejs project on GitHub via the link in the tool header.

There is no artificial file-size cap like the ones many online converters impose on free plans, because your file is never uploaded. The only practical limit is your own device memory, since the audio is decoded and encoded in memory. On a typical laptop this handles long recordings comfortably, though very large files may be slower or memory-heavy on low-end phones.

No installation is needed. It is a pure web tool that runs in any modern browser using the built-in Web Audio API and the lamejs library that loads with the page. There is no desktop app, no browser extension, and no command-line tool like FFmpeg to set up. It also works offline once the page has loaded.

Yes. The tool decodes your file to its original sample rate and channel layout, then encodes the output at that same sample rate, preserving mono or stereo as it was. So a 44.1 kHz stereo source stays 44.1 kHz stereo in the converted file. Only the container and codec change, along with the MP3 bitrate you choose for compressed output.

Yes. It runs in modern mobile browsers that support the Web Audio API, so you can convert audio on a phone or tablet without an app. Encoding uses your device CPU, so phones are slower than a laptop, and very large files use more memory, so keep an eye on file size on lower-end devices. For the smoothest experience with big files, a desktop or laptop is best.

Converting to WAV is lossless from the decoded audio, so it faithfully stores what the browser decoded. Converting to MP3 applies lossy compression, so some data is discarded to reduce size, with higher bitrates keeping more quality. Re-encoding an already-lossy file (such as MP3 to MP3 at a lower bitrate) loses a little more each time, so for the best result convert from the highest-quality source you have.