NEW · FFmpeg.wasm · 100% Browser-Based

Free Audio Extractor

Strip the audio track from any video — export as MP3, WAV, AAC, or OGG. 100% in your browser. No upload, no signup, no watermark.

🎬
Drop a video file
MP4 · MOV · WebM · MKV · AVI · GIF
Files stay on your device · Never uploaded

Why Do This in Your Browser?

Stripping audio from video is one of those tasks that should be one click and isn't. Online tools upload your file. Desktop tools require installing something. Browser extensions want sketchy permissions. All you wanted was the audio track from an interview, podcast recording, or YouTube download.

This tool does it in one click. Drop a video in, pick an output format, and the audio is extracted via FFmpeg.wasm running locally. When the source audio format matches the target (MP4 with AAC audio → AAC output), the tool stream-copies — no re-encode, completes in seconds. Otherwise it transcodes at high quality.

How It Works

Most modern video files use AAC audio in an MP4 container. Extracting that audio as AAC is a stream copy — the audio packets are simply lifted out of the video container and written to an AAC file. Bit-exact, near-instant. Extracting as MP3 or OGG requires transcoding, which still runs at 5–10x real-time on a modern laptop.

Output formats: MP3 (universally compatible, slight quality loss when transcoded from AAC), WAV (uncompressed, large files, archive-grade), AAC (stream-copy from most MP4s, smallest file at equal quality), OGG (open-format, used by some platforms). For audiobook-style extracts (interviews, lectures), MP3 at 128 kbps is the safe default.

Tip: Once you've extracted the audio, run it through the Audio Transcription tool — Whisper handles all four output formats this extractor produces. If you only want audio from a specific portion of the video, trim the video first, then extract.

Common Use Cases

Podcast Recording from Video
Extract audio from a video-recorded podcast for separate audio-only distribution.
Interview Audio
Pull the audio track from a Zoom or video interview for transcription or quote-pulling.
Music from Performance Videos
Extract a song from a recorded live performance into a portable audio file.
Voice Memos from Screen Recordings
Strip the voiceover from a screen-recorded tutorial to release as an audio-only commentary.
Sound Effect Capture
Extract a specific sound (a laugh, a door slam, a notification) from a longer video clip.
Transcription Pipeline
Convert video → audio → transcription. The Audio Transcription tool works directly on the extracted MP3.

How We Compare

Honest read on free, paid, and self-hosted options for this kind of job:

UDT Audio Extractor (this tool): Free, browser-based, stream-copy when formats align. No upload, no watermark, no signup.
Online Audio Converter: Free with ads + 100MB cap. $9/mo. Cloud-based.
Convertio MP4 to MP3: Free tier 100MB + watermark indirectly via download throttle. $10/mo. Cloud.
Audacity (desktop): Free, open-source, ideal for editing extracted audio. Overkill for plain extraction; this tool extracts in one step without installing anything.
FFmpeg CLI: Free, instant — `ffmpeg -i input.mp4 -vn -acodec copy output.aac`. Requires installing FFmpeg. This tool is the same operation wrapped for browser use.

Frequently Asked Questions

Will quality be lost during extraction?
When extracting AAC from MP4 (or MP3 from MP3-encoded sources), no — it's a stream copy, bit-exact. When transcoding (e.g., AAC source → MP3 output), there is a small generational loss, similar to copying a JPEG.
Which output formats are supported?
MP3, WAV, AAC, and OGG. MP3 is the safest default for sharing; WAV for archiving; AAC for stream-copy from most MP4s.
Are my videos uploaded anywhere?
No. The extraction runs entirely in your browser via FFmpeg.wasm — the 32MB engine downloads once and caches locally.
How long does extraction take?
Stream-copy extractions (AAC source → AAC output) complete in 2–5 seconds regardless of video length. Transcoded extractions run at 5–10x real-time on a modern laptop — a 10-minute video takes about 1–2 minutes.
What's the maximum file size?
Limited by browser memory. Laptops handle 1–2GB videos, phones cap around 500MB. The audio output is much smaller than the input video.
Can I extract a specific time range?
Not directly in this tool. Trim the video first with the Video Trimmer, then extract audio from the trimmed result. Or extract the full audio and trim it in an audio editor.
Can I extract multiple audio tracks (e.g., dubs)?
Not yet — current tool extracts only the first/default audio track. Multi-track support is on the roadmap. For now, use FFmpeg CLI for multi-track extraction.
What bitrate is used for MP3 output?
Default is 192 kbps VBR — transparent for speech, near-transparent for music. You can adjust to 128/192/256/320 kbps in the format options.

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