Convert video or audio to 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.
- Nothing is uploaded
- Works offline
- Open source
- No limits, no watermark
Done
Open the network tab. It stays empty.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
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. 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 2 GB video converts as fast as your computer can read it.
Verify it yourself. Load this page, turn off Wi-Fi or switch to airplane mode, and run the tool. 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 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 and no size cap. You can load the page, 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.
Is there a length or size limit?
No fixed limit. 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 ten times the size of an MP3.