Audio editing online has been awkward for a decade. The major sites either limit you to a few minutes per upload, watermark the output, or charge a subscription for what is fundamentally a few minutes of FFmpeg work. We use the same FFmpeg — but compiled to WebAssembly so it runs in your browser. Drop in a 30-minute MP3, an hour-long voice memo, an entire podcast episode in WAV. Nothing uploads. The conversion happens in a Web Worker so your browser stays responsive, and stream-copy mode (no re-encoding) makes most operations near-instant. For audio that contains private content — voice notes, interview recordings, dictation, music demos — local processing is the only sensible option.
The same FFmpeg the entire video industry uses. MP3, M4A, AAC, WAV, OGG, FLAC, OPUS — convert any format to any other with the same fidelity as the desktop binary.
Trimming an MP3 by 30 seconds usually takes less than half a second because we do a container-level cut without re-encoding. Same audio, different boundaries.
Audio Trimmer renders a peak-decimated waveform so you can drag the in/out handles to exactly the moment you want. No vague time-input boxes.
FFmpeg-WASM is a sizeable download (~25 MB) so the tool only loads it when you press the action button. Soft warning on mobile for files large enough to risk OOM.
Open the Audio Trimmer, drop your MP3, drag the in/out handles on the waveform to where you want the clip, hit Trim. The whole pipeline is FFmpeg-WASM running locally — your file never leaves the tab.
Yes — the Audio Converter handles M4A, MP3, WAV, AAC, OGG, FLAC, and Opus in any direction. Stream-copy where formats are container-compatible, full re-encode otherwise.
A 60-minute podcast trims in seconds (stream-copy) and converts in a few minutes (re-encode). The bottleneck is your device CPU, not network bandwidth — so a fast laptop beats a fast internet connection.
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