MP4 to MP3

Convert MP4 video to MP3 for free — pick the range and create it in your browser, no upload.

Drop video files hereProcess many files at once

No upload · processed on this device

MP4 to MP3

MP4 is the video format used by most phones, cameras and editors.

The audio track is decoded and encoded to MP3; the browser must support the audio codec inside the file.

Your file is never uploaded — it is processed inside this browser.

Video to MP3

Choose a range and export audio. Availability depends on browser codecs.

How it works

Open the source file
Choose the processing mode and settings
Run, inspect the result and download

Supported formats

MP4 / WebM / MOV / MP3 / WAV / OGG / M4A → MP3 / WAV — Input decoding and output encoding depend on browser support.

What this tool does

Extract audio incrementally with selectable 96–320 kbit/s MP3 or PCM WAV.

Implementation and verified quality

advanced · ranged demux / WebCodecs / LAME WASM. Quality qualification is in progress. Pro/Flagship quality has not been established.

Before you export

Fast cut shrinks to inner keyframes. Precise mode re-encodes; codec availability varies. Temporary outputs use local browser storage when available. Compatibility recording retains its short-clip limits.

Frequently asked questions

What determines the supported size?

Actual device memory, storage and codec support. Tested examples are evidence, not a guarantee for every file. advanced

Are my files uploaded?

Nerulio processes selected files on your device and has no file-upload API. Optional engines and models are downloaded from third parties; those requests expose connection information such as your IP address.

Will my work be saved automatically?

No. Images and editing state stay in this tab; media output can use local temporary storage. Changing language preserves your work; reloading, closing the tab, or following a link to another page can clear it.