Drop your audio or video file, pick an MP3 bitrate, and download the converted MP3.
Audio Converter
freetoolonline.com editorial teamTurn an audio file, or the soundtrack of a video, into an MP3 right in the browser. Choose an MP3 bitrate, drop or select your file, and save the result - conversion runs in the tab using FFmpeg.wasm and nothing reaches a server. The working copy is released when you navigate away.
You can start from MP3, WAV, AAC, OGG, FLAC, or M4A audio, or a video whose sound you want to keep; the output is always an MP3.
Key features
- Encodes MP3 with libmp3lame and strips the video stream, so a video file's audio track comes out as a clean MP3.
- Choose the MP3 bitrate from 128, 192, 256, or 320 kbps (192 is the default).
- Runs entirely in your browser tab via FFmpeg.wasm - no bytes leave your device.
- The FFmpeg.wasm engine (about 31 MB) loads only on your first conversion, so the page stays light until you actually use the tool.
- The result is delivered as an in-tab download link, and the temporary input and output files are cleared from memory once the download is ready.
- MP3 output carries no patent-licensing fee today - Fraunhofer and Technicolor's royalty program for the format ended in 2017 - so this converter, like most modern software, can offer MP3 without a licensing note (what changed when MP3 patents expired).
When to use it
- Pull the soundtrack out of a video clip and keep it as an MP3.
- Re-encode a large WAV or FLAC recording into a smaller, widely-playable MP3.
- Set a lower bitrate when file size matters most, or 320 kbps when you want higher-fidelity audio.
Privacy and data handling
Your input file is processed locally in the page and discarded when you close it - nothing is stored or uploaded at any step. Because the conversion happens on your device rather than a server, private recordings never leave the browser.
How the conversion runs
While the tool works, a status line reports load and conversion progress so you can see what is happening. If FFmpeg cannot process the file, the tool shows the error message in a panel instead of failing silently, so you know to try a different file or setting.
Frequently Asked Questions
What does Audio Converter do?
It turns an audio file - or the audio track of a video - into an MP3 right in your browser, at a bitrate you choose. Nothing is uploaded: the conversion runs on FFmpeg loaded into the page, so the file never leaves your device.
When should I reach for audio converter?
Reach for it when you have an audio file, or a clip whose sound you want to keep, and you need a compact, widely-playable MP3. Common cases: shrinking a large WAV or FLAC recording, or pulling the soundtrack out of a video. Pick 128 kbps when file size matters most and 320 kbps when you want the best quality (192 kbps is the default). Because everything is processed on your device, private recordings never leave the browser.
What complementary tools work well alongside audio converter?
If you are starting from a video, convert or trim it first with the Video Converter, which handles MP4, MOV and WebM and can also trim a segment or output MP3 or WAV. Once you have the clip you want, bring it here to re-encode the audio to an MP3 at your chosen bitrate. The related-tools list at the foot of the page links the other media tools on the site.