MP3 Converter & Compressor
Convert and compress MP3 audio files online. Optimize audio file size and quality.
Upload Audio File
Note: Full audio conversion and compression requires ffmpeg.wasm (large file size). This tool currently provides basic audio file handling. For advanced features, consider using desktop tools or server-side processing.
Introduction
The MP3 Converter & Compressor tool lets you convert audio files to MP3 and reduce their size directly in your browser. It is ideal for preparing audio for podcasts, online courses, messaging apps, and websites without installing desktop software.
When to use this tool
Use this tool whenever you need to change audio format or shrink file size: optimizing background music for web pages, preparing voice recordings for upload, or compressing audio attachments for email and chat.
How to use
Upload your audio file
Click the upload area or drag and drop audio files such as WAV, M4A, or existing MP3s into the tool.
Choose format and quality
Select MP3 as the output format and adjust bitrate or quality settings based on whether you prefer smaller size or higher fidelity.
Convert and compress
Start the conversion. The tool processes your audio locally in the browser using Web APIs, without sending files to a server.
Download the optimized MP3
Save the converted MP3 file and use it in your player, website, or project with reduced file size.
Examples
Compressing podcast episodes
Before uploading a podcast episode, convert and compress the audio to a reasonable bitrate so listeners can stream or download it more quickly.
Optimizing voice messages for support tickets
When users submit long voice notes, convert and compress them to MP3 so they can be attached to tickets without hitting size limits.