Extract Audio from Video Online — Free, No Upload, No Limits
Drop any video file and get the audio track in seconds. This free audio extractor runs entirely in your browser using FFmpeg.wasm — your video file is never uploaded to any server, never touches the internet after the page loads, and leaves no trace when you close the tab. Works with MP4, MOV, MKV, AVI, WebM, and virtually any format FFmpeg handles.
Unlike server-based converters, there's no file size cap. Whether it's a 500 MB meeting recording or a 4K video several gigabytes large, the only limit is the RAM in your device.
How to Use the Audio Extractor
Three steps and you're done.
- Drop or select your video — drag any video file into the upload zone, or click "Choose File." Supported formats include MP4, MOV, MKV, AVI, WebM, WMV, FLV, 3GP, and more.
- Configure output settings — pick your format (MP3, WAV, AAC, or OGG), choose a bitrate, and optionally enable volume normalization or fade-in/out.
- Extract and download — click "Extract Audio & Download." The first run loads the ~30 MB FFmpeg engine from CDN; subsequent extractions are instant.
Why "No Upload" Actually Matters
Most online audio extractors work by sending your entire video to a server, processing it there, and then letting you download the result. That process is fine for casual videos — but it creates real privacy exposure for:
- Meeting recordings (Zoom, Google Meet, Microsoft Teams) that contain confidential business discussions or client information
- Medical or legal recordings — patient consultations, depositions, legal proceedings
- Interview recordings — source protection for journalists and researchers
- Personal family videos — private moments you'd rather not transmit to a startup's server
This tool uses FFmpeg compiled to WebAssembly, which runs the entire processing pipeline inside your browser tab. No network request is made to any server during extraction. You can disconnect from the internet after the page loads and it will still work.
Audio Format Guide
Choosing the right output format makes a real difference depending on your use case.
- MP3 (lossy): The universal standard. Best for podcasts, sharing, and streaming. 128 kbps is standard; 320 kbps is near-lossless. Every device and platform supports it.
- WAV (lossless): Identical quality to the source audio — no encoding loss. Best when you plan to edit the audio further. Files are large (~635 MB per hour of stereo).
- AAC (lossy): More efficient than MP3 at the same bitrate. Best for Apple ecosystem, iOS devices, and podcast platforms that accept M4A. Smaller files than MP3 at equivalent quality.
- OGG (lossy): Open-source format, similar size to MP3. Best for web projects or open-source platforms. Broadly supported in browsers but limited on mobile.
Common Use Cases
- Podcasters: Extract a clean audio track from a video interview recorded on Zoom or Loom. Enable volume normalization to even out mic levels between speakers.
- Meeting recordings: Pull the audio from a recorded call to create a transcript or share with team members who couldn't attend. Use MP3 at 64–96 kbps mono for very small files.
- Content repurposing: Turn a YouTube tutorial you recorded, a webinar, or a product demo into a standalone podcast episode or audio course.
- Music and samples: Extract the audio track from a video of a live performance or rehearsal session. Use WAV for lossless quality if you plan to mix it further.
- Students and educators: Extract lecture audio from recorded video classes to create audio-only study materials that are easier to review on the go.
Frequently Asked Questions
Is my video uploaded to a server when I extract audio?
No. This audio extractor uses FFmpeg.wasm — a WebAssembly port of FFmpeg — to process your video entirely inside your browser tab. Your file is read from your local storage, processed in memory, and the audio is written directly to a local download. No data is transmitted to any server at any point. You can disconnect from the internet after the page loads and it will still work.
What video formats are supported for audio extraction?
Any format that FFmpeg handles — which is essentially every common video format: MP4, MOV, MKV, AVI, WebM, WMV, FLV, 3GP, TS, MXF, and more. If your media player can open it, this tool can almost certainly extract the audio. Uncommon formats may occasionally fail depending on the codec.
What is the maximum file size for audio extraction?
There is no hard limit imposed by this tool — processing depends only on your device's available RAM. Modern browsers handle video files of several gigabytes without issues. For very large files (10 GB+), ensure you have sufficient free RAM. 16 GB of system RAM is recommended for processing 4K video files over 5 GB.
How do I extract audio from a Zoom recording?
Zoom saves local recordings as .mp4 in your Documents/Zoom folder by default. Drag and drop that file into the audio extractor. Select MP3 at 128 kbps for sharing or podcast use, or WAV if you need lossless quality for further editing. The audio — including all participants — will be extracted without uploading the file anywhere.
Does extracting audio affect the sound quality?
If you extract to WAV (lossless), quality is identical to the original audio track — zero encoding loss. If you extract to a lossy format like MP3 or AAC, there will be minor quality reduction from the re-encoding step. For audio that was already MP3-encoded inside the video (common in many MP4 files), choosing WAV completely avoids double-encoding loss and preserves the original quality.
Resources
- FFmpeg Documentation — Comprehensive reference for the FFmpeg engine that powers this tool, including all supported formats and codec options.
- MDN — Web Audio API — Technical reference for browser-based audio processing used alongside FFmpeg.wasm.
