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Free, full-featured web-based audio and waveform editing tool with multitrack support, no installation or account required.
AudioMass is a free, full-featured audio and waveform editor that runs entirely in the browser, usable directly at audiomass.co or self-hosted from source. It includes a full multitrack mode, allowing users to layer multiple tracks, drag clips around the timeline, crossfade overlapping regions, record onto armed channels, and bounce the entire mix down to a single output file. The editor covers standard waveform editing operations alongside effects like a parametric EQ and LUFS loudness metering, and supports common audio formats including MP3 and FLAC. AudioMass can be run locally via a bundled Go server (audiomass-server.go) or a simple Python webserver (audiomass-server.py), making it straightforward to self-host or embed. The project is publicly hosted on GitHub, though notably it does not specify an open-source license, which has been an open, unresolved issue in the repository since 2020 — meaning its legal terms for reuse or redistribution are technically undefined despite the public source availability.
