Nouplo

Video to MP3

The sound out of your video, as an MP3, made on your device.

Drop files here

or click to choose from your deviceAccepted: MP4, M4V, WEBM, MOV, MKV

Up to 3 files per runUp to 150 MB per file5 runs per dayRemove limits with Pro✓ Works offline

Your files stay on your device

This tool runs entirely in your browser. Nothing is uploaded, nothing is stored, and you can even turn off your internet connection before you start.

Example

Example: a 40-minute recorded interview turned into a podcast episode

interview.mp4, a 40-minute video call recorded for a podcast, under the 150 MB free limit. Only the voices are needed. Settings: Bit rate 64 kbps, Channels Mono.

  1. Your browser decodes the sound track, usually at 48 kHz, a rate MP3 takes as it is; mono mixes the two channels into one at equal weight.
  2. The MP3 is written at a constant 64 kbps: 8,000 bytes for every second, so 40 minutes come to about 19.2 MB.
  3. The file keeps the video’s name: interview.mp3.
Bit rate 40 minutes come to One minute
320 kbps about 96 MB2.4 MB
192 kbps about 57.6 MB1.44 MB
128 kbps about 38.4 MB0.96 MB
96 kbps about 28.8 MB0.72 MB
64 kbps about 19.2 MB0.48 MB

interview.mp3, about 19.2 MB, clear for two people talking. The bit rate alone sets the size: mono at the same bit rate weighs the same as stereo, so choose the bit rate for size and mono for speech.

How it works

  1. Drop the videos. Several at once is fine — each one becomes its own MP3.
  2. Pick a bit rate. 192 kbps is a good place to leave music; a lecture, an interview or a podcast is perfectly clear at 64 kbps in mono, a third of the size of 192.
  3. Press Extract MP3. The sound is decoded by your browser and encoded here on the page, so a long recording reports its progress as it goes.
  4. Download the MP3, which takes the video's own name.

Frequently asked questions

Is my video uploaded?
No. Both halves happen on your device: your browser decodes the video's sound track, and the MP3 encoder runs in this page. Nothing is sent anywhere, and there is no queue to wait in.
Which files can it read?
Whatever your browser can play: MP4, M4V, MOV, WebM and MKV in most cases, and the audio formats too if you want to convert one of those instead. If the browser cannot play a file, it cannot read it here either, and it says so rather than producing silence.
Which bit rate should I choose?
For music, 192 kbps is where most people stop hearing the difference on ordinary speakers, and 320 kbps is as good as MP3 gets. For anything that is mostly talking — a lecture, a meeting, a podcast — 64 kbps in mono is clear, a third of the size of 192 kbps and a fifth of 320. A higher bit rate cannot add back what the video’s own sound track already lost, so there is no point converting a 128 kbps sound track at 320.
Why is the MP3 bigger than I expected?
Because the bit rate you choose decides the size, not the video’s: a two-minute clip at 192 kbps is about 2.9 MB whatever the video weighed. Dropping to 96 kbps halves it.
How long does it take?
A few seconds a minute of audio on a desktop. The page stays usable while it runs — the encoder hands the browser back between blocks rather than freezing the tab — and a long recording shows its progress.
Does mono make the file smaller?
Not at the same bit rate. The MP3 is written at a constant bit rate, so 64 kbps is about 0.48 MB a minute in stereo or in mono. Mono spends all of those bits on one channel, which is why speech sounds better in mono at a low bit rate; to halve the size, halve the bit rate. For M4A or WAV, use Convert audio.
What are the free limits?
Three files a run at 150 MB each and 5 runs a day, on the free plan. The MP3 carries nothing added: no watermark, no spoken tag, no footer.

Related tools

♪ Convert audio MP3, M4A or WAV, converted on your device and never uploaded. ♪ MP4 to WAV The sound of a video as an uncompressed WAV, extracted in your browser. ▶ Compress video A smaller MP4, made on your device by the same encoder your phone records with. ✂ Cut MP4 Keep the part of the MP4 you want.