SquishClipMP4 to MP3 Converter — Extract Audio from Video
Pull the audio track out of any video file and save it as an MP3 — entirely in your browser.
How to convert MP4 to MP3
Drop your video file onto the box above (or click to browse). Choose your preferred MP3 quality — 192 kbps works for most uses — then wait for the progress bar to complete. Hit the Download MP3 button when it finishes. The whole process runs in your browser; nothing is sent to a server.
The tool accepts MP4, MOV, MKV, and WebM files. Any video container that includes an audio track can be converted. If your file has no audio stream, you will see a clear message explaining why the conversion cannot proceed.
What "extracting audio" actually does
A video file is a container — it holds a video stream and (usually) one or more audio streams wrapped together. Extracting audio means reading the audio stream from that container, decoding it, and re-encoding it as MP3. The video track is discarded entirely.
The MP3 encoder used here is LAME 3.100, compiled to WebAssembly and running directly in your browser. LAME is the reference implementation for MP3 encoding and is used in virtually every MP3 encoder you have encountered — Audacity, HandBrake, FFmpeg, and iTunes all use it or a derivative. At 192 kbps, LAME produces output that is transparent to most listeners.
Which quality setting should you choose?
128 kbps is fine for spoken-word content: podcasts, lectures, voice memos. The file size is roughly 1 MB per minute. Audible artefacts are present on music but tolerable.
192 kbps is the standard recommendation for music. At this bitrate, most people cannot distinguish MP3 from the original in a double-blind test. File size is about 1.4 MB per minute.
320 kbps is the ceiling for MP3. It is appropriate if you are archiving audio for long-term use, plan to edit it in a DAW, or simply want every bit of quality available. File size is about 2.4 MB per minute.
Why process in the browser?
When you upload a video to an online converter, the file travels from your device to their server — a process that can take minutes for a large clip — and is temporarily stored on hardware you have no control over. This converter runs the entire extraction on your own machine. A 1 GB video file never leaves your device. You can confirm this by opening your browser's Network tab while the tool is running — you will see no upload traffic.
In-browser processing is also faster for large files on fast hardware. The WASM LAME encoder processes audio at roughly 55× real-time speed — a 10-minute video typically extracts in well under a minute.
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Frequently asked questions
Does the quality of the MP3 depend on the original video?
Yes. The tool extracts and re-encodes the audio track from your video. If the source audio is low quality — for example, recorded at a low bitrate — the MP3 cannot recover information that was never there. For most YouTube-resolution or camera footage, 192 kbps MP3 is indistinguishable from the source.
What is the maximum file size I can convert?
There is no enforced limit — the tool runs entirely in your browser and processes files locally. In practice, very large files (over 2–3 GB) may hit browser memory limits on machines with less RAM. For most video files — including hour-long recordings — this is not an issue.
Does it work with MOV, MKV, and WebM files too?
Yes. The converter accepts MP4, MOV (iPhone, DJI), MKV (OBS, Matroska), and WebM files. Any video container that contains an audio track is supported.
Is this converter free?
Yes, completely free. No account, no watermark, no conversion limit. The site is supported by display ads.
Why convert in-browser instead of using an online tool?
Most online converters upload your file to a server before converting it. That means your video travels over your internet connection (slow for large files) and is processed on a machine you do not control. This converter processes your file entirely in your browser using WebAssembly — nothing is ever sent to a server. You can verify this by watching the Network tab while the conversion runs.
Which bitrate should I choose?
192 kbps is the standard recommendation for music. Most listeners cannot distinguish 192 kbps from 320 kbps MP3 in a blind test. If you are archiving audio for long-term use or editing, 320 kbps gives extra headroom. 128 kbps is suitable for spoken-word content like podcasts or voice recordings where file size matters more.
What browser works best?
Chrome or a Chromium-based browser (Edge, Brave) gives the most reliable results. Firefox and Safari have partial WebCodecs support; if a conversion fails, try it in Chrome.