Free Audio Converter

Yes, it is completely free with no signup, no account, and no usage limits. Because the conversion runs on your own device instead of a paid cloud service, there are no per-file costs to pass on. You can convert as many files as you want, as often as you want, without a credit card, an API key, or a rate limit.

No. The entire process, decoding the file and re-encoding it, happens locally in your browser using the Web Audio API and lamejs. Your audio is never uploaded, logged, or stored anywhere, which makes this safe for private recordings, client work, and unreleased tracks. You can confirm this by opening the Network tab in your browser DevTools while you convert a file and watching that no request carries your audio.

Most online audio converters send your file to a server, convert it there, and hand back a download link, which means your audio leaves your control and usually runs into a file-size cap, a queue, a watermark, or ads on the free tier. This tool works the opposite way: everything happens inside your browser tab, so there is no upload, no size limit, and no waiting in line behind other users. It is more private and often faster for large files, since you never spend time uploading and downloading.

You can convert to MP3 or WAV. On input, the tool accepts anything the browser Web Audio API can decode, which covers common formats like MP3, WAV, M4A, OGG, FLAC, and AAC. So you can go from WAV to MP3, MP3 to WAV, M4A to MP3, and similar combinations. If a particular file will not decode, re-export it as MP3, WAV, or M4A and it will convert reliably.

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.