Is my video private when I extract audio online?

Yes. Zolkit's Audio Extractor processes your video entirely inside your browser using WebAssembly. Your file is never uploaded to a server. The audio engine (~30 MB) is downloaded once and cached locally — after that, extraction works completely offline.

What's the difference between MP3, AAC, WAV, and FLAC?

MP3 is the most compatible format — plays on every device and app. AAC is Apple's format and is slightly more efficient than MP3 at the same bitrate. WAV and FLAC are lossless — they preserve every detail of the original audio, but produce much larger files. FLAC is a compressed lossless format (roughly half the size of WAV). For casual listening, MP3 at 192 kbps is indistinguishable from the original. Choose WAV or FLAC only if you plan to do further audio editing.

What if the extracted audio sounds worse than the original?

This cannot happen with WAV or FLAC extraction. For MP3/AAC/OGG, the output quality is determined by the bitrate you choose. If the original video had low-quality audio (e.g., a compressed 96 kbps AAC track), outputting it at 320 kbps MP3 won't improve it — the quality ceiling is set by the source. In that case, choose Standard (192 kbps) to avoid inflating the file size for no benefit.

How do I convert an iPhone video (MOV) to MP3?

Upload the MOV file directly — Zolkit reads it natively without any conversion step. iPhone MOV files contain AAC audio at 44.1 kHz. Set format to MP3 and quality to High (320 kbps) for a clean conversion. A 1-minute iPhone video typically yields a 2–5 MB MP3 file.

Can I extract audio from a video with multiple audio tracks?

Yes. FFmpeg automatically selects the default audio track (usually the first track). For most videos — movies, recordings, screen captures — there is only one audio track and the extraction is straightforward.

Is there a file size limit?

Zolkit does not enforce a file size cap. The practical limit is your device's available RAM. Most modern computers handle files up to 1–2 GB without issues. Audio extraction is much less memory-intensive than video compression because only the audio stream is decoded and re-encoded.

Audio Extractor

Extract audio from any video file in your browser — choose output format and quality. No upload, no account, completely private.

Drop your video here

or click to browse

MP4, MOV, AVI, MKV, WebM, WMV, FLV and more · up to 2 GB

Output Settings

Output Format

Bitrate

Browse Use Cases

MP4 to MP3 Converter MOV to MP3 Converter Online Extract Audio from Video Online

Free Online Audio Extractor — Convert Video to Audio in Your Browser

Zolkit's Audio Extractor uses FFmpeg WebAssembly to extract audio from video files entirely in your browser. Upload MP4, MOV, AVI, MKV, WebM, or WMV files and extract the audio track as MP3, AAC, WAV, FLAC, or OGG — without sending your file to any server. Choose 320 kbps for archival quality or 192 kbps for a smaller file that sounds identical on speakers and headphones. All processing happens locally on your device — your videos never leave your browser.

100% Private

Your video never leaves your device. All extraction runs in WebAssembly inside the browser tab — no server, no cloud, no data retention.

5 Output Formats

Choose MP3 for universal compatibility, AAC for Apple devices, WAV or FLAC for lossless archival, or OGG for web and open-source projects.

Quality Control

Three MP3/AAC/OGG bitrate presets — 320 kbps (high), 192 kbps (standard), 128 kbps (low). WAV and FLAC are always lossless.

FFmpeg-Powered

Uses FFmpeg's audio demuxer and libmp3lame encoder — the same pipeline used by professional audio and video tools worldwide.

Free, No Account

No subscription, no sign-up, no watermark, no file size cap beyond your device's memory. Zolkit's Audio Extractor is completely free.

Any Video Format

Supports MP4, MOV, AVI, MKV, WebM, WMV, FLV, M4V, 3GP, TS, and most other video containers. If FFmpeg can read it, you can extract from it.

How to Extract Audio from a Video

1
Upload your video — drag it onto the page or click to browse. Supports MP4, MOV, AVI, MKV, WebM, WMV, FLV and more up to 2 GB.
2
Choose output format (MP3, AAC, WAV, FLAC, or OGG) and quality (bitrate for lossy formats). MP3 at 192 kbps is the best default for most uses.
3
Click 'Extract Audio', wait a few seconds for processing, then preview the file size and download the extracted audio.