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Extract audio tracks from MP4 video files to MP3. Free online tool to convert media in your browser with no upload.
Conversor de MP4 a MP3 is a free online audio tool that runs entirely in your browser — your files never leave your device and are never uploaded to any server. No installation, no signup; works on both phone and desktop, ready to use instantly.
Las herramientas de audio se ejecutan completamente en tu navegador, con soporte para MP3, WAV, OGG y más. Los controles de bitrate y frecuencia de muestreo te permiten ajustar la salida a tus necesidades.
We found that most audio tools require uploading media to remote servers. Since privacy is our core principle, we built this tool to run entirely in your browser using Web Audio API.
Sí, completamente gratuita y sin registro.
Sí, funciona en navegadores móviles con soporte táctil.
Audio
La mayoría de las herramientas ofrecen opciones de bitrate y frecuencia de muestreo para mantener la calidad original o ajustarla según tus necesidades.
ToolPure supports MP3, WAV, AAC, FLAC, OGG, and M4A formats. You can convert between any combination of these formats with customizable bitrate (64-320 kbps) and sample rate (8-48 kHz).
Yes, you can trim audio to specific start and end times, and merge multiple audio files into a single track. Merging supports up to 50 files and preserves the original sample rate.
Once the page is loaded, all audio processing runs entirely in your browser using Web Audio API and ffmpeg.wasm. No internet connection is needed after the initial page load.
Yes. Conversor de MP4 a MP3 runs entirely in your browser: files you select are never uploaded to any server — all processing happens in your device's memory and is wiped when you close the page.
🔒 Privacy & Security：All processing happens locally in your browser. Files are never uploaded or stored.
🔒 Privacy: All processing happens locally in your browser. Your files and data never leave your device — no upload, no server, no tracking.