How to convert MP4 to MP3 without installing anything

Want just the sound from a video — a recorded lecture, a voice memo filmed on your phone, a rehearsal or a podcast recorded as video? You don’t need to install a converter. The Glowtrack Studio video to MP3 tool runs in your browser, reads the audio straight out of the video file and saves it as an MP3, without uploading anything.

Open the free video to MP3 converter →

What it handles

Video formats: MP4, MOV (including iPhone recordings), M4V, WebM and MKV.
Output: MP3 at 128–320 kbps, M4A (AAC) or lossless WAV.
Trimming: drag on the waveform to keep only part of the soundtrack.
Quiet recordings: the Volume option can raise speech to podcast level (−16 LUFS) without clipping.

Which quality to pick

Speech: 128 kbps MP3 is plenty and keeps files small.
Music: 320 kbps MP3, or WAV if you’ll edit it further.
Apple devices: M4A (AAC) is smaller than MP3 at the same quality.

Step by step

Open the Glowtrack Studio video to MP3 converter and drop in one or more video files.
Choose MP3 and a quality. For quiet speech, set Volume to “Podcast (−16 LUFS)”.
Optionally drag the edges of the waveform to keep only part of the audio, and press Preview to check it.
Press Convert, then Download — or convert several and download them all as a ZIP.

Open the free video to MP3 converter →

Questions

Is it safe for private videos?

Yes. The conversion happens inside your browser and nothing is uploaded, so private recordings stay on your device.

Can it download audio from YouTube?

No. It converts video files you already have. Downloading from streaming sites usually breaks their terms of service.

Does it work on a phone?

Yes, in a modern browser. Very long videos convert faster on a computer.