Convert
Turn any audio into MP3, privately
Convert almost any audio format to MP3 at a chosen bitrate, processed entirely on your own device.
For the best results: 192 kbps is the sweet spot for music; 128 kbps is fine for podcasts and voice. Converting an already-compressed file to a higher bitrate cannot restore quality. It only makes the file bigger.
Advanced settingsoptional, defaults work well
Converted entirely in your browser, your files are never uploaded. Very large files depend on your device's memory.
What is MP3 Converter?
MP3 Converter is a free file converter that turns WAV, M4A, OGG, FLAC and even video soundtracks into MP3 files at a bitrate you choose, processed entirely on your own device. The audio is converted by an ffmpeg engine that runs inside your browser, so your recordings never leave your device. No upload, no queue, and no account, and once the engine has loaded it works even offline.
- ✦Runs entirely in your browser. Nothing you enter is ever uploaded
- ✦No account, no sign-up, and no data leaves your device
- ✦Works offline once the page has loaded
See it in action
A folder of mixed OGG and M4A voice notes needs to be plain MP3 for an old car stereo.
What you drop in
note.ogg, quality High (192 kbps)
What you get
note.mp3, decoding to the exact source duration in testing. Any common audio input, and even video files, come out as clean MP3.
Tip: MP3 remains the most universally accepted format ever shipped. For voice, Good (128 kbps) is usually indistinguishable and saves a third of the space.
Use cases
What people use it for
Pull the soundtrack out of a recorded lecture video so you can listen back on the commute.
Standardize interview recordings from three different devices into consistent MP3s before transcription.
Convert a folder of mixed-format voice notes into MP3s that play in any car or app.
Who uses MP3 Converter?
Students
turn recorded lectures and tutorial videos into MP3s they can revise from while walking or driving
Journalists
normalize interview audio from phones, recorders, and video cameras into one format their transcription workflow accepts
Fitness instructors
convert routine soundtracks and cue recordings so they play reliably on whatever speaker a venue provides
How it works
- 1Choose your files. They open in your browser, not on a server.
- 2Your device converts, compresses, or resizes them locally, with no upload.
- 3The converted files download straight back; nothing is kept anywhere.
Tips for the best results
- Use 128 kbps for anything that is mostly talking and save the higher settings for music.
- Convert the original recording rather than a copy that has already been through another converter.
- For a video, expect the MP3 to be a small fraction of the source file's size.
- If a very large video fails to convert, your device likely ran short of memory; try a shorter file.
- The engine caches after your first visit, so later conversions start without any download wait.
FAQ
Frequently asked questions
What does bitrate actually mean in an MP3?
Bitrate is how much data the file spends describing each second of sound, measured in kilobits per second. At 320 kbps the encoder has generous room and keeps nearly everything audible; at 128 kbps it must discard more, which careful listeners can sometimes detect in cymbals and complex passages. Higher bitrate therefore means better fidelity and a proportionally larger file.
Should I pick 128, 192, or 320 kbps?
Match the bitrate to the material. Spoken word, lectures, and meeting recordings are perfectly served by 128 kbps, since voices occupy a narrow frequency range. Music for everyday listening sits happily at 192 kbps, a common sweet spot of size against fidelity. Reserve 320 kbps for music you care about hearing at its best, as it is MP3's maximum quality.
Can this really take the audio out of a video file?
It can, because a video file is a container holding separate video and audio streams. The ffmpeg engine running in your browser opens the container, ignores the picture entirely, and re-encodes just the sound as an MP3. That makes talks, webinars, and home videos listenable on their own, though the video stream itself is untouched and left behind.
Where does my file go while it converts?
Nowhere beyond your own machine. The entire decode and encode happens in the browser's memory, so a confidential meeting recording or an unreleased song has no server-side copy that could be logged, retained, or breached. You could switch to flight mode after the page loads and the conversion would proceed identically.
Will converting a low-quality file at 320 kbps improve it?
No, and this is a common trap. Encoding at a high bitrate preserves whatever the source contains, but it cannot resurrect frequencies an earlier compression already removed. A 96 kbps recording re-encoded at 320 kbps just wastes space storing the same degraded audio. Choose a high bitrate to protect good sources, not to repair poor ones.
How do I extract audio from a video for free?
Drop the video straight into this converter, choose a bitrate, and download the resulting MP3; no software installation or account is involved. Because the work happens locally in your browser, even a private or unlisted recording stays on your device. Remember that longer videos need more memory, so trim first if your machine struggles.
What is the highest quality an MP3 can be?
The format tops out at 320 kbps, which is what the highest setting here produces. Beyond that point MP3 simply has no way to store additional detail, which is why lossless formats like FLAC exist for archival purposes. For listening rather than archiving, well-encoded 320 kbps is transparent to almost everyone.
Why is MP3 still so popular?
Ubiquity. After nearly three decades, MP3 support is baked into effectively every phone, car stereo, browser, smart speaker, and editing program on earth, and its patents expired in 2017, removing the last licensing friction. Newer formats compress a little better, but none can match the certainty that an MP3 will just play.
Are there any usage limits?
None. Everything is generated locally in your browser, so there is no server cost, no metering, and no daily cap, use it as many times as you like, completely free.
Also useful
Related free tools
More Convert tools
