MP3 Converter Online โ€“ 128, 192 or 320 kbps

Convert audio or video to MP3 at 128, 192 or 320 kbps in your browser. Batch files, choose quality, and account for your device's RAM.

Click for theater mode

Drop audio or video files

Choose any media file. Conversion happens locally in your browser. No uploads.

Select media files to begin.

Selected files are processed in your browser and are not uploaded by the converter.

Conversion Queue

0 files total

Your conversion tasks will appear here.

How to Use

  1. Drag and drop your media files into the upload area or click "Select Files". You can add multiple files for batch processing.
  2. Choose 128, 192, or 320 kbps. The default is 192 kbps; a higher bitrate generally creates a larger file.
  3. Click "Convert to MP3". On first use, the browser downloads the conversion engine before processing the queue.
  4. Once completed, click the "Download" button to save the MP3s to your device.

Core Features

  • Three Real MP3 Bitrates: Choose 128 kbps for speech and smaller files, the default 192 kbps for a balanced output, or 320 kbps for a higher data rate.
  • Audio, Video, and Batch Input: Add multiple common media files. The converter extracts the audio track and creates a separate MP3 for each queue item.
  • Input Files Stay in the Browser: The converter does not upload your selected files. It downloads the FFmpeg WebAssembly engine when first needed.
  • Device-Based Limits: Duration, codec, and file size affect conversion time and RAM use. Large files can fail when the browser or device runs out of memory.

Working with uncompressed recordings? See the Raw Audio to MP3 converter.

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Calculation Logic

The converter loads FFmpeg WebAssembly in your browser, writes the selected input to its temporary file system, removes any video track, and encodes the audio with libmp3lame. Your selection is passed as a target bitrate of 128k, 192k, or 320k.

MP3 is a lossy format. A higher bitrate can retain more information during this new encode, but it cannot restore detail already missing from the source. Processing time depends on the device CPU and RAM, media duration, and input codec.

FAQ

Which MP3 bitrate should I choose?

128 kbps is often sufficient for speech, 192 kbps is the balanced default, and 320 kbps uses more data. The useful setting depends on your source and preferred file size.

Are my input files uploaded?

The converter processes input files in your browser and does not send them to a conversion service. It still needs a network connection to load the FFmpeg engine the first time it is used.

Why can a large file be slow or fail?

The browser holds the input, conversion engine, and output in memory. Close other tabs or use a shorter file if your device does not have enough available RAM.

What happens if I upload a video file?

For media formats that FFmpeg can decode in your browser, the converter ignores the video track and encodes the available audio track as MP3.

Is a 320 kbps MP3 lossless?

No. MP3 remains a lossy format at every available bitrate.