Turn a video into an MP3 on your device

Why you’d do this

Sometimes the video is beside the point. A voice memo someone filmed instead of recording, a lecture you want to listen to on a commute, a song clipped out of a longer recording — in all of these the picture is dead weight, and what you actually want is a small audio file you can play anywhere, attach to an email, or drop into a playlist app that has no idea what to do with an MP4.

Doing the conversion on your phone or laptop, in the browser, means you’re not uploading a video file to some third-party site just to get its soundtrack back — which matters more than it sounds like it should, given how often that video is a voice note, a meeting, or something else you’d rather not hand to a server you don’t control.

How, with the named tool

Dzzz has two tools for this, and which one you want depends on what you’re after.

Video → MP3 is the direct route: pick a video (or audio) file, choose a quality, and get back an MP3.

1. Pick your file. Drop a video or audio file on the dropzone, or tap it to choose one from your device.
2. Choose a quality. Pick High, Medium or Small — the three settings are just different MP3 bitrates: 192, 128 and 96 kbps.
3. Convert and save. Tap Convert and watch the percentage. When it finishes, play the MP3 right there in the page, then tap Save / Share.

Audio Converter does the same underlying job but adds a second choice: the output format. Drop one or more files, use Add more files to extend the list, pick MP3 or M4A, pick a bitrate, then tap Convert — the files run one after another, and each finished row gets its own Save / Share button.

What to watch for

MP3 or M4A — the format choice is really a codec-family choice. Neither tool can copy your video’s existing audio track byte-for-byte; both always re-encode it, because turning a video into a standalone audio file means decoding the sound and writing it back out as a new file. So the real question isn’t whether to re-encode — you always are — it’s which codec you land in. Most phone video already carries AAC audio inside its MP4 or MOV container. Picking M4A in Audio Converter keeps you in that same AAC family, one re-encode instead of a format hop; picking MP3 switches codecs, which is the safer default when you don’t know what the file is headed to next, since almost everything on earth plays an MP3.

The bitrate you pick is the only quality knob. High (192 kbps) is the closest to source quality and the biggest file; Small (96 kbps) is fine for spoken word — a voice memo or a lecture — where you’re not listening for detail, but will sound thin on music. Medium (128 kbps) is the reasonable middle for most everyday clips.

On iOS, Save / Share opens the share sheet, not a file download. Tapping it hands the finished MP3 to the device’s native share sheet — from there you pick Save to Files, or share it straight into another app. That’s how saving a browser-made file works on iOS generally; it isn’t an extra step dzzz adds on top.

The audio engine downloads the first time you use it in a session. Dzzz’s audio and video tools all share one underlying ffmpeg engine, about 31 MB, and it streams in from its host the first time you run a conversion in a browser tab — after that it’s cached for the rest of the session. You’ll see the tool doing that work before the progress bar starts moving; it isn’t stuck, it’s fetching what it needs to run the conversion on your device instead of a server.

FAQ

Will converting to MP3 make my audio sound worse?

A little, and there’s no way around it — re-encoding is genuinely lossy, the same as any MP3 you’ve ever downloaded. At High (192 kbps) the difference is hard to notice on a phone speaker or earbuds; at Small (96 kbps) it’s a real trade-off you’re making on purpose for a smaller file. Pick High if the audio itself is the point — music, an interview you care about — and Small only when you’re optimizing for size, like a long voice memo.

Should I use Video → MP3 or Audio Converter?

Video → MP3 if you just want an MP3 and nothing else to think about — it’s one format, three quality buttons. Reach for Audio Converter when you have more than one file to get through in one go, or when you specifically want M4A instead of MP3, or when your starting file is already audio (WAV, M4A) rather than video.

Does any of this get uploaded anywhere?

No. Both tools run the conversion entirely in your browser, using ffmpeg compiled to WebAssembly. The file is read from your device, converted on your device, and saved back to your device — nothing is sent to a server at any point, including while the engine itself is downloading.