MP3 converter: turn any video or audio file into MP3
Pull the sound out of a video, or turn any audio file into an MP3. Your files are converted on this device and never uploaded. Have an MP4? Use MP4 to MP3. To keep the sound of any video as MP3 or WAV, see Extract audio from video.
- Nothing is uploaded
- Works offline after first use
- Open source
- No sign-up, no watermark. The limit is your device’s memory (phones hold less).
Converts video or audio files (MP4, MOV, MKV, WebM, M4A, WAV, FLAC, OGG, AAC and more) to MP3 at 96 to 320 kbps, one file or a batch. The conversion runs in this tab with LAME compiled to WebAssembly, so your files are not uploaded. It is free, needs no account and adds no watermark. The limit is your device’s memory, and phones hold less.
Your iPhone may take a few seconds to prepare the video first, longer if it's stored in iCloud.
Done
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Convert any file into MP3
- Drop one or more video or audio files on the page, or tap to pick them.
- Keep MP3 and choose a quality, or leave it at 192 kbps. Choose mono for a voice recording.
- Press Convert. One file downloads straight away; several download as a zip.
Which MP3 quality?
- 96 kbps: speech, lectures and voice memos, smallest files.
- 128 kbps: podcasts and a small file that still sounds fine.
- 192 kbps: the default, good for most music.
- 320 kbps: the best MP3 quality, for a recording you will keep only as an MP3.
- Mono halves the size of a voice recording.
Convert by file type
For one kind of file, a dedicated page opens with the settings already chosen: MP4 to MP3, MOV to MP3, WAV to MP3, M4A to MP3, FLAC to MP3, AAC to MP3, OGG to MP3, WebM to MP3, MKV to MP3, Opus to MP3 and AIFF to MP3. To keep the sound of a video as MP3 or WAV, see Extract audio from video. For other formats such as FLAC or M4A, use the audio converter.
How it works
- Drop one or more videos or audio files (MP4, MOV, WebM, M4A, WAV, FLAC and more), or tap to pick them.
- Choose MP3 or WAV. For MP3 pick a quality: 192 kbps suits music, 96 kbps is plenty for speech. Choose mono to halve the size of a voice recording.
- Convert. Each file is decoded and encoded in your browser; one downloads straight away, several download as a zip.
In your browser, not on a server
Your browser decodes the sound track with the same audio decoders it uses to play media on any website (AAC for MP4, MOV and M4A; Opus or Vorbis for WebM; FLAC, WAV and MP3). The samples are resampled to 44.1 kHz and handed to LAME, the reference MP3 encoder, compiled to WebAssembly and served by this site. WAV files are written directly by a few lines of code in the page. A WMA, which no browser plays, is decoded in a background worker by a separately loaded decoder module. Most video runs on your browser's WebCodecs through Mediabunny. For old formats the browser cannot read, the page loads a decoder built from FFmpeg's libraries (LGPL) only when you convert such a file. Everything happens in memory in your tab.
Compared with upload-based tools: Online converters upload the whole video just to keep its sound, cap free files at a few hundred megabytes, and make you wait in a queue. Home videos, lectures and voice memos are personal. Here the file never leaves your device, so a 1 GB video converts as fast as your computer can read it, and the limit is your device’s memory (phones hold less).
Verify it yourself. Give the page a short while after your first run to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Is this MP3 converter free?
Yes. Whether you look for an MP3 converter or an mp 3 converter, this one is free, needs no account and adds no watermark. There is no daily limit or paywall, because the conversion runs on your device; the only limit is its memory.
Is my video uploaded?
No. Your browser reads the sound track with its own decoders, and an MP3 encoder (LAME, compiled to WebAssembly) runs inside the page to write the file. There is no server in the process, so there is no upload to wait for. After your first run you can switch off Wi-Fi and it still works.
Which files can I convert?
Anything with a sound track your browser can play: MP4, M4V and MOV (from phones, cameras and screen recorders), WebM and MKV, and audio files such as M4A voice memos, WAV, FLAC, OGG, Opus and MP3 itself. If a file will not open, try it in another browser: Safari reads a few Apple formats that others do not.
What MP3 quality should I choose?
192 kbps is transparent for most music and is the default. Use 320 kbps if the MP3 will be your only copy of a high-quality recording, 128 kbps for podcasts and lectures, and 96 kbps mono for a voice memo you want small. Converting to MP3 can never add quality the source did not have.
Can I convert several files at once?
Yes. Drop them together and they are converted one after another; one file downloads straight away, several download as one zip.
What can I convert to MP3?
Video such as MP4, MOV, MKV and WebM, and audio such as M4A, WAV, FLAC, OGG, AAC and Opus. The page uses your browser’s own decoders, so a file has to be one your browser can play.
Is there a length or size limit?
There is no file size cap from us; very large files depend on your device’s memory. The whole file is read into your device’s memory, so a feature-length film works on a laptop but may be too much for an older phone. The MP3 of an hour of audio at 192 kbps is about 85 MB.
Can I get a WAV instead?
Yes. Choose WAV and you get uncompressed 16-bit, 44.1 kHz audio, the format audio editors and some upload forms ask for. It is about seven times the size of an MP3 at the default 192 kbps.
Do I need the audio if I only want the words?
No. To get the speech as text, drop the video straight on Video to text: it reads the soundtrack itself, so you do not have to extract the audio first.
More video and audio tools
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Trim a clip, pick a size and frame rate, and get a looping GIF. The video is decoded by your browser and never leaves this device.
GIF to MP4
Turn animated GIFs into small MP4 videos that post and play anywhere. Converted on this device, never uploaded.
Compress video
Make a video a fraction of the size, or fit it under a limit like 10 MB for Discord or 25 MB for email. It is compressed on this device and never uploaded.
Video to MP4
Turn MOV, MKV and WebM files into MP4s that play everywhere. Converted on this device, never uploaded.
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