An MP4 is mostly picture: a one-hour Zoom or phone video can be a gigabyte, while the sound inside it fits in about 60MB of MP3. This converter keeps the audio track, drops the video, and saves an MP3 that plays in any app. The video never leaves your computer or phone.
Your file never leaves your device. Nothing is uploaded.
Drop an audio or video file here
Drop an .mp4 (or any video) up to 500MB. It stays on your device.
Conversion runs on FFmpeg, compiled to WebAssembly, inside this browser tab. Licences and source
Most MP4s carry AAC audio at 128 to 192 kbps, so 192 kbps MP3 keeps everything that's there. Use 128 kbps for talks and meetings to halve the size; going above the source's own bitrate only makes a bigger file.
Nowhere. The converter runs inside your browser tab, so the file is read and converted on your own device and saved straight back to it. It is never uploaded to Wave or anyone else, and we never see its name or contents.
Up to 500MB. Because the work happens in your browser's memory, very large videos can fail on phones; a computer with a few tabs closed handles them best.
The MP3 is a fraction of the size, so it uploads in seconds instead of minutes and fits under the free transcription tool's 200MB limit. Click "Transcribe this file for free" after converting to get a transcript with speakers and a summary.
Related: Free Audio Converter That Never Uploads Your File · Free audio transcription · Free YouTube Transcript Generator · Video to MP3: Extract the Audio From Any Video · Convert M4A to MP3 in Your Browser · Convert WAV to MP3 and Make It 10x Smaller · Convert MP3 to WAV for Editing and Playback · Convert OGG and Opus Voice Notes to MP3 · Convert WebM to MP3 Right in Your Browser · Convert MOV to MP3: Audio From iPhone Videos
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