Video & audio converter
MP3 Converter
Convert video and audio files to MP3: MP4, MOV, WEBM, MKV, AVI, WAV, M4A, AAC, OGG and FLAC. Free, with no sign-up.
Tested by Thiago · Updated
Free, no sign-up · Sent over HTTPS · Files are deleted from our server automatically after 30 minutes
How to convert video or audio to MP3
- Add your files: drag them into the box above, or click "Choose files".
- Click "Convert to MP3" and wait a few seconds while we process them.
- Download your MP3 files. Uploaded files are deleted right away, and converted files are removed from our server after 30 minutes.
Why convert to MP3?
MP3 is still the most compatible audio format: it plays in every car stereo, phone, music app and editing tool. This MP3 converter accepts both audio and video files, so you can turn a WAV recording, an M4A voice memo or the soundtrack of a video into a small, high-quality MP3 in one step.
- You want the audio from a video in MOV, WEBM, MKV or AVI format.
- A voice memo (M4A) or a recording (WAV, FLAC) needs to be smaller or more compatible.
- Your car stereo, speaker or app only plays MP3 files.
What to expect from each kind of file
This page accepts very different files, and the MP3 you get back behaves differently depending on what went in. We ran each type through the same setting the converter uses and compared the sizes.
- Video (MP4, MOV, WEBM, MKV, AVI): the picture is dropped, so the drop in size is dramatic. A 30-second phone clip of 72 MB became a 0.5 MB MP3.
- Lossless audio (FLAC, WAV): a big reduction with very little audible change. A 15 MB FLAC song came out at 3.3 MB.
- Already compressed audio (M4A, AAC, OGG, OPUS): the size stays similar or even grows, because the MP3 is written at a fixed high-quality setting, not at the original bitrate.
- Voice messages in OPUS: a 1 minute 42 second recording of 310 KB turned into a 1.2 MB MP3, about four times larger, yet it plays on far more devices.
What is kept and what is not
Text tags such as the title and artist are copied into the MP3 when the original file has them. We checked this with MP3, M4A, FLAC and WAV files. An album picture embedded in the original is not copied, so music players will show a blank cover until you add one again.
A mono recording stays mono and the sample rate is not changed. Nothing is cut: the MP3 has the full length of the audio or of the video soundtrack.
Tips for the best result
- We use high-quality variable bitrate (usually about 130 to 175 kbps), which sounds great while keeping files small.
- From a video, only the soundtrack is kept.
- Converting from one compressed format to another (like OGG to MP3) always loses a little quality. Start from the best original you have.
- If you have the same audio as FLAC or WAV and as M4A or OPUS, convert the lossless one: it gives the cleanest MP3.
About these formats
Supported formats: We accept video (MP4, MOV, WEBM, MKV, AVI) and audio (WAV, M4A, AAC, OGG, OPUS, FLAC). From a video, we keep only the soundtrack.
MP3: The most popular audio format. It compresses sound to a small size while keeping good quality, and it plays on any device.
Frequently asked questions
Which files can I convert to MP3?
Video: MP4, M4V, MOV, WEBM, MKV and AVI. Audio: WAV, M4A, AAC, OGG, OPUS (WhatsApp voice messages) and FLAC.
Will converting FLAC or WAV to MP3 reduce quality?
MP3 is compressed, so a tiny amount of detail is removed, but at the bitrate we use most people cannot hear the difference.
How big will the MP3 be?
In our tests, about 1.0 to 1.3 MB per minute of audio at the quality we use.
Why is my MP3 bigger than the voice message I uploaded?
Voice-message formats like OPUS use a very low bitrate that only a few apps understand. The MP3 is encoded at a higher-quality setting so it plays everywhere, and that takes more space. The sound does not get better, only more compatible.
Does the MP3 keep the song title and artist?
Yes, when the original file has those tags. The embedded cover picture is not kept.
Can I convert a video that has no sound?
No. If the video has no audio track there is nothing to put in the MP3, and the conversion ends with an error.