How to Extract Audio from Video Online
Choosing the output format matters more than the extraction itself. Here is how to pick.
A video file holds picture and sound as two separate streams inside one container. Extracting audio means keeping the sound and throwing away the picture — which is why a 150MB clip usually becomes a few megabytes.
The extraction is the easy part. The decision that matters is what format the audio lands in, because that determines whether you can do anything useful with it afterwards.
MP3 or Something Else?
If you are going to listen to it, put it on a phone, or send it to someone, use MP3. It plays everywhere and the files are small. That covers most people, and Video to MP3 does exactly that in one step.
Use something else when the audio is going somewhere rather than being listened to:
- Into an editor — Audacity, Premiere, Resolve, a DAW. Use WAV or FLAC.
- Into a transcription tool — WAV. Most speech-to-text systems expect it, and some are measurably more accurate on uncompressed input.
- Into further processing — noise reduction, levelling, mastering. Every lossy step compounds, so start lossless.
- Into an archive — FLAC. Lossless, and about half the size of WAV.
The reason is simple: the audio was already compressed once when the video was encoded. Extracting to MP3 compresses it a second time. For listening that is fine. For anything that will be processed again afterwards, it is damage you did not need to take.
The Formats, Briefly
- MP3 — Universal. The default choice for listening and sharing.
- WAV — Uncompressed, roughly 10MB per minute in stereo. The safest input for other software.
- FLAC — Lossless, about half the size of WAV. Better than WAV unless your software will not read it.
- M4A — AAC. A natural fit when the video came from an Apple device and stays in that ecosystem.
- OPUS — Very efficient, especially for speech at small sizes. Well supported on the web, less so in older desktop software.
- OGG — Open and widely supported in web and game engines.
- AIFF, WMA, CAF — For particular software that expects them.
How to Extract It
- Open Extract Audio and upload your video. MP4, MKV, MOV, M4V, AVI, WebM, WMV, FLV and 3GP are accepted, up to 100MB.
- Choose the output format using the guidance above — MP3 to listen, WAV or FLAC to edit.
- Press Extract audio and download the result. Nothing is kept: uploads and results are deleted 15 minutes later.
Only want MP3 and would rather not choose? Video to MP3 skips the decision entirely.
What Quality to Expect
Extraction cannot improve anything. The audio track inside a video was compressed by whatever encoded the video, and that loss is already baked in. A recording with room echo and a distant microphone extracts as a WAV with room echo and a distant microphone — just a much larger file.
What extraction to a lossless format does protect you from is the next loss. If you are about to run noise reduction, cut the audio into segments, and export again, doing all of that on a WAV rather than an MP3 keeps the final result cleaner.
Size, Roughly
- MP3 at 192 kbps — about 1.4MB per minute
- M4A at 192 kbps — about the same
- FLAC — about 5MB per minute, varies with the material
- WAV — about 10MB per minute in stereo, fixed regardless of content
A 10-minute clip therefore lands around 14MB as MP3 and around 100MB as WAV. If the WAV turns out to be inconveniently large, Compress Audio will bring it down once you have finished editing.
Frequently Asked Questions
Can I extract audio from a YouTube link?
No. This works on video files already on your device — there is no URL input.
What if the video has no audio track?
The job fails with an error rather than handing you a silent file. Check the video plays with sound before uploading.
My video is bigger than 100MB. What now?
Trim it in a video editor and upload only the section you need. Audio is a small fraction of a video's size, so the part you actually want is usually well under the limit.
Can I extract just part of the audio?
Extract the whole thing first, then trim it with the Audio Cutter. Want a ringtone out of it? The Ringtone Maker takes it from there.
Related Guides
- How to convert video to MP3 online — the MP3-only route, step by step
- Convert audio format online — what each format is good for
- How to reduce MP3 file size — for when the result is too large
Summary
To extract audio from video online: upload the video, choose an output format, download. Use MP3 for listening, WAV or FLAC when the audio is going into an editor or a transcription tool, and M4A if you are staying on Apple devices. Extraction never improves quality — but choosing a lossless format stops you from losing any more of it.