How it works

Under the hood: how CompressMP3 keeps audio pristine.

CompressMP3 is a locally executed pipeline. We pair WebAssembly FFmpeg, a preset command builder, and deterministic metadata handling to keep your MP3s sounding brilliant.

WebAssembly FFmpeg core

We ship the latest FFmpeg build compiled to WebAssembly. When you click “prime engine,” the binary streams into your browser and stays cached for the session.

Preset-aware command builder

Each preset maps to FFmpeg arguments that balance bitrate, sample rate, channel layout, and filter graphs. Switch between presets and we recompute the command instantly.

Deterministic exports

Compression runs inside a Web Worker, writing to an in-memory filesystem. When the job completes, we read the output into a Blob, copy metadata, and hand you the file.

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