Audio Converter Online

Convert audio privately in the browser

Different apps prefer different audio formats. A podcast editor may ask for WAV, a sharing form may expect MP3, a web project may use OGG and a phone workflow may be easier with M4A. This audio converter lets you choose a local audio file, or a video that contains audio, and save the sound in the format you need without uploading the source to a conversion service.

The page uses ffmpeg.wasm, a WebAssembly build of the ffmpeg media engine. When you start a conversion, the selected file is written into a temporary in-memory file system in your browser, transcoded and downloaded back to your device. Media Tools does not receive your audio, video or converted output, which makes the workflow suitable for private recordings, client files and rough creative drafts.

Choosing MP3, WAV, OGG or M4A

MP3 is the safest default for sharing because it creates compact files and plays almost anywhere. WAV is much larger, but it is uncompressed and useful when you plan to continue editing. OGG is a good open format for modern web projects and some game or app workflows. M4A uses AAC audio, which is efficient and common on phones and current media players. If you are not sure what a site accepts, MP3 is usually the first choice to try.

Performance and quality notes

Audio conversion is usually faster than video conversion, but long recordings still use browser memory and processing time. The first run may pause while the WebAssembly engine downloads; later conversions in the same tab can reuse it. Keep the original file until you have played the download and confirmed that the format, duration and sound quality match your needs.

What the converter actually does

Every conversion drops any video stream and re-encodes the audio with fixed settings. MP3 uses the LAME encoder at 192 kbps, OGG uses Vorbis at 192 kbps and M4A uses AAC at 192 kbps. WAV is written as 16-bit PCM at 44.1 kHz in stereo. There are no bitrate or sample-rate controls, so the output is a sensible general-purpose version rather than a fine-tuned one.

Converting between two lossy formats, for example MP3 to OGG, decodes and encodes the sound a second time, which can add small artifacts. Whenever you still have an original WAV or other lossless source, convert from that instead. Turning an MP3 into WAV makes the file bigger but does not restore detail that was discarded earlier.