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AudioMass: How to Edit Audio in Your Browser

AudioMass is a free, open-source browser editor for waveform cuts, effects, recording and multitrack arranging, with MP3 export and saved sessions.
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AudioMass is a free, open-source audio editor that runs in a web browser. It can handle waveform edits such as trimming and cutting, apply effects, record audio, and arrange multiple tracks. You can export a finished edit as an MP3; multitrack work can be rendered as WAV or MP3, and a session can be saved as an .amss file for reopening later.

What AudioMass does

AudioMass is designed for editing audio in a browser rather than installing a desktop application. Its website says it runs without a backend or plug-ins and loads audio formats supported by the browser. That makes it useful for a quick edit, but compatibility depends on your browser and the file you want to use. AudioMass official website

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The project documents both single-track waveform editing and multitrack arranging. Its About page describes workflows for recording or using existing tracks, making selections, applying effects, and working offline. The project characterizes it as suitable for tasks such as arranging takes or assembling a podcast; that is the developer’s description, not an independent performance assessment. AudioMass About

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Which edits and effects are available?

Waveform editing

Documented editing tools include cut, copy, paste, trim, reverse, and invert. AudioMass also lists zero-crossing selection, cue markers, beat detection, snap-to-beat, and undo. These tools cover common cleanup and arrangement tasks, such as removing unwanted sections, moving a selection, or aligning edits with a beat. AudioMass About

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Effects and repair

The project’s feature list includes volume changes, compression, paragraphic equalizers, reverb, delay, and pitch and speed profiles. It also documents repair tools for clicks, hum, and hard edit points. Which tools suit a particular recording depends on its source and the result you want; the feature list does not establish that every problem can be repaired automatically. AudioMass About

How to edit a file in AudioMass

  1. Open AudioMass in a browser and load an audio file the browser supports. The project does not publish a complete format-and-device compatibility matrix, so verify that your particular file opens in your setup.

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  2. Use the waveform to select the section you want to change. Cut, trim, copy, or paste selections as needed; use playback and navigation to check the edit.

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  3. Apply any needed effects, such as volume adjustment, equalization, reverb, or repair. Listen to the result before exporting.

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  4. Choose File and then Export to MP3 to export a single-track edit as an MP3, as described by the AudioMass About page.

Can AudioMass record and edit multiple tracks?

Yes. AudioMass documents recording as well as multitrack editing. The repository README describes layering tracks, moving clips, crossfading overlaps, recording onto armed channels, and bouncing a mix to one file. These capabilities can support arranging takes or combining voice and other audio, though the documentation does not provide a full device compatibility guide for recording inputs. Check that your browser can access the intended microphone or input device before relying on it. AudioMass repository README

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How do you export or resume a multitrack project?

The About page describes multitrack mixdown as an offline render to one WAV or MP3 file. It also says multitrack sessions can be saved as .amss files and reopened later. A rendered audio file is the finished mix; the session file is for returning to the multitrack work. The documented File > Export to MP3 path applies to MP3 export, while the project describes mixdown separately. AudioMass About

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What to check before using it

License and redistribution

AudioMass identifies its own license as MIT. The project also notes that bundled libraries have separate licenses, mostly BSD-style, and that the MP3 encoder is under LGPL. If you plan to redistribute a build rather than simply use the editor, review the repository’s third-party notices and applicable dependency terms. AudioMass About · AudioMass repository README

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