About the MP3 Converter
MP3 Converter turns almost any sound file into an MP3. Drop in a WAV, M4A, AAC, OGG, Opus or FLAC file, or a video such as MP4, MOV, WebM or MKV, choose a quality from 96 to 320 kbps and keep stereo or switch to mono. The page tells you roughly how big the MP3 will be, plays the result so you can check it and lets you download it. The MP3 is made with the LAME encoder inside your browser, so your file is never uploaded and there is no size limit set by a server.
Updated October 2026
How to use the MP3 Converter
- 1Select an audio or video file, or drop it on the page.
- 2Choose the quality: 192 kbps is a good choice for music, 128 kbps for speech.
- 3Choose Keep stereo or Mono (smaller).
- 4Press Convert to MP3 and wait for the progress bar.
- 5Play the result, then download your MP3.
What MP3 is good for
MP3 plays on practically every phone, computer, car stereo and portable player ever made. That makes it the safest format for sharing music, recordings and voice notes. If a device refuses another format, an MP3 will almost always work.
Choosing a quality
Bitrate is how many kilobits of data are spent on each second of sound. Higher numbers keep more detail and make larger files. For most listening, 192 kbps sounds very close to the original, 128 kbps suits speech and casual listening, and 320 kbps is the maximum for an MP3.
- 96 kbps: speech, lectures, voice memos
- 128 kbps: podcasts and background music
- 192 kbps: good for music on phones and speakers
- 320 kbps: the highest MP3 quality
Converting video to audio
Drop in a video and only its sound track is converted, which is handy for saving a lecture, a concert recording or an interview as an audio file. Use only videos you own or have permission to use. If you want the original audio without re-encoding, Extract Audio from Video can copy it as it is.
Before and after converting
Cut the part you need with the Audio Trimmer first so the file is shorter, join several recordings with the Audio Joiner, and shrink the result further with the Audio Compressor. To go the other way, from MP3 to an uncompressed file, use the Audio to WAV Converter.
Privacy and the encoder
The conversion uses the LAME encoder (lame.sourceforge.io) through the lamejs library under the LGPL license, running inside your browser. Because there is no upload, there is no waiting for a server and no copy of your file anywhere else.
Features
- Reads WAV, M4A, AAC, OGG, Opus, FLAC and common video files
- Six quality levels from 96 to 320 kbps
- Estimated size before you convert
- Stereo or mono
- Preview before download
- Private: converted in your browser
Frequently asked questions
Which files can I convert to MP3?
Anything your browser can decode: WAV, M4A, AAC, OGG, Opus, FLAC and MP3 itself, and the sound track of MP4, MOV, WebM and MKV videos. AVI and WMV files cannot be read in a browser.
What bitrate should I choose?
192 kbps is a good balance for music. Use 256 or 320 kbps for the highest quality or when you plan to edit the file further. For speech, podcasts and voice notes, 96 to 128 kbps is enough.
Will the MP3 sound as good as the original?
MP3 is lossy: it throws away detail that is hard to hear. At 192 kbps most people cannot tell it from the original on normal speakers. Converting a file that is already lossy, such as another MP3 or an M4A, loses a little more.
Why is the MP3 smaller than my WAV file?
WAV stores every sample. MP3 compresses it, often to about a tenth of the size at 128 kbps, depending on the length and the quality you choose.
Is there a file size or length limit?
No limit from us, because nothing is uploaded. Your device's memory sets the practical limit, and very long files take longer. A recent computer converts music faster than real time.
Does it keep the tags and cover art?
No. The MP3 contains the sound only. Use a tag editor to add the title, artist and cover afterwards.
Is it legal to convert files to MP3?
Converting your own recordings and files you have the right to use is fine. Do not convert or share copyrighted material without permission.
Is my file uploaded?
No. The conversion runs in your browser, so private recordings and videos never leave your device.