Convert Video to Audio Free — Extract MP3 from MP4 in Your Browser

Sometimes you don't need the video at all — you need the sound. A lecture recording you want to listen to on a run, an interview you need to feed into a transcription tool, a music video you want to sample, a voice memo trapped inside a screen recording. Pulling the audio track out of a video file used to mean installing desktop software or uploading the file to a website and hoping it didn't keep a copy. You can now convert video to audio free, right inside your browser, with the file never leaving your device.

The BrowseryTools Video to Audio Converter extracts the audio track from MP4, MOV, MKV, AVI, and WebM videos and saves it as MP3, M4A, OGG, or WAV. It handles a whole batch of files at once, lets you trim each one to just the clip you need, and does all of the encoding on your own machine — no upload, no size limit games, no waiting on a server queue.

Why Extract Audio, and Why In-Browser Beats Uploading

Extracting audio from video is useful in more situations than you'd think: turning a talk or webinar into something you can listen to hands-free, pulling a clean audio file out of an interview recording so a transcription tool can process it, sampling a piece of music from a video, or simply sharing just the sound of a clip without sending the full video file.

Most online converters ask you to upload the video first, which means waiting on your upload speed, trusting a stranger's server with a file that might be private, and often hitting a free-tier size cap that conveniently pushes you toward a paid plan. Doing the conversion in-browser sidesteps all three problems at once: the video never leaves your device, there is nothing to wait on but your own machine's processing speed, and there is no artificial limit designed to sell you an upgrade — just a sensible per-file cap to keep the tab responsive.

How the Batch Conversion Works

Drop in one file or a batch of videos — the converter queues them all. For each file, or for the whole batch at once, pick your output format and bitrate. If you only need the sound from part of a clip, set a start and end time to trim it before converting, so you are not waiting on the whole file to encode for a ten-second clip. Click convert, and the tool works through the queue, encoding each file locally. As soon as a file finishes, its download button appears — grab it right away, or keep going and download each one as it's ready.

Choosing a Format

MP3 is the safe default — every device, app, and player on the planet supports it, so reach for it unless you have a specific reason not to. M4A fits neatly into the Apple ecosystem and generally sounds better than MP3 at the same file size, so it is a good pick if you live in iTunes, GarageBand, or an iPhone Voice Memos-adjacent workflow. OGG is an open, patent-free format favored by open-source software and some web platforms. WAV is uncompressed and lossless — pick it when you plan to edit the audio further, since re-encoding a compressed file loses a little quality every time you touch it. For bitrate, 192k is a solid, unremarkable default for speech and general use; bump it to 320k if you are extracting music and want to preserve as much detail as possible.

Trimming Without Re-Encoding the Whole File

If you only need thirty seconds out of a forty-minute recording, there is no reason to convert the entire thing. Each file in the queue has its own start and end fields — enter them as mm:ss, like 01:15 to 01:45, and the converter extracts just that window before encoding. It is the fastest way to pull a specific quote, sound bite, or musical phrase out of a longer video.

Honest Limits

Because everything runs on your own hardware, a long or high-resolution file will take noticeably longer to process than the same file would on a beefy server — that is the trade-off for privacy and no upload wait. The first time you use the tool, your browser fetches the underlying ffmpeg engine, which is roughly 31 MB; after that it is cached, and every later conversion starts instantly. There is also a 500 MB per-file cap, which comfortably covers nearly everything except feature-length raw footage.

Try It Now

Open the Video to Audio Converter, drop in your files, pick a format, and convert. If the source video is oversized to begin with, run it through the video compressor first. And once you have the audio in hand, the audio transcriber will turn it into text and subtitles — all still free, all still running entirely in your browser.