Select an audio file, choose a quality setting, and encode locally in your browser using a WebAssembly LAME 3.100 MP3 encoder. Advanced users can add ID3 tags, cover art, output names and a technical conversion log.
Common browser-readable audio and video files can be converted locally. Very large files may be limited by browser memory.
Encoder note: this web page uses a browser/WASM encoder based on stable LAME 3.100. It does not include the experimental cVBR or cVBRb functions available in the downloadable Windows builds. Read the cVBR comparison.
The simple Quality menu remains the main control. Channel and sample-rate options are applied when supported by the browser conversion path.
ID3 tags are written locally in the browser after encoding. Smaller cover images are recommended to avoid unnecessarily large MP3 files.
Ready.
This tool converts supported audio and video files to MP3 directly in your browser. It uses a WebAssembly encoder based on stable LAME 3.100. Your selected file is processed locally on your device and is not uploaded to lamemp3.co.uk.
The web encoder is intended for quick, convenient MP3 creation. For cVBR, cVBRb, command-line use, batch encoding, and experimental branch features, use the downloadable Windows builds.
Use the Online MP3 Encoder when you want a simple browser-based conversion without installing anything. Use the Windows command-line builds if you need cVBR, cVBRb, batch processing, scripting, or exact control over LAME options.
The conversion runs locally in your browser. Your selected media file is not uploaded to this website.
The online encoder is intended as a simple browser-based MP3 tool using LAME 3.100 through WebAssembly. It does not expose the cVBR or cVBRb branch features. For those functions, use the downloadable Windows builds.
Use Advanced Options for ID3 tags, cover art, filename choices and the technical conversion log. For batch work, command-line automation, cVBR and cVBRb testing, use the Windows builds.