AudioMass

AudioMass is a free, open-source audio editor that runs in a web browser, combining waveform work with recording, looping, and multitrack mixing. It fits creators who want substantial editing without installing desktop software, particularly when offline work and reusable project files matter. The trade-off is a browser workflow that is less comfortable on phones and can struggle while decoding very large audio files.

Overview

AudioMass covers everyday waveform work—cutting, copying, pasting, trimming, silencing, reversing, inverting, and processing selected regions—then extends into recording and multitrack arrangement. Its effects include gain, fades, compression, normalization, reverb, delay, distortion, pitch shifting, pitch and speed profiles, and repair tools. That breadth suits editing, cleanup, sound design, and preparation of spoken or musical material without a subscription.

The editor runs locally in the browser without a backend and can keep working offline after it has loaded. Multitrack sessions save as .amss files and finished mixes export as WAV or MP3, so a project can be reopened and a mix delivered in familiar formats. AudioMass began in 2018 and is MIT licensed; bundled libraries carry their own licenses, including LGPL licensing for the MP3 encoder.

Key features

Waveform editing and effects

Region-based operations handle precise rearrangement and silence cleanup. Compression and normalization address dynamics and level consistency, while reverb, delay, distortion, and pitch controls cover creative treatment. Repair tools add a practical option for restoration work, although the browser context is less suited to users who need a specialist desktop production environment.

Looping

The seamless-loop tool previews crossfades, trims silence, adjusts zero crossings, repeats sections, and opens the loop in a new editor tab. Those controls are useful for building repeatable beds, samples, and game or ambient assets without manually hunting for clicks at loop boundaries.

Multitrack and project handling

Multitrack mode arranges clips across tracks, automatically crossfades overlapping clips, provides track controls, supports recording, and mixes down the result. Saving sessions as .amss files is valuable for work that needs later revision rather than one-off exports.

Pricing

There is no paid tier, subscription, trial period, seat allowance, or usage quota to weigh against the free plan. The zero-cost model is a strong fit for independent creators, students, and teams comfortable with a browser editor; organizations wanting paid support or centrally managed collaboration should look elsewhere. AudioMass does not provide cloud collaboration.

Platforms

AudioMass is offered as a web application and can be self-hosted. It runs in a browser and supports offline work once loaded, but the maker does not name specific browsers or devices. Mobile optimization is still limited, so phone and tablet users should not make it their default editing workspace. Very large files can consume browser resources during decoding; there is no progress callback or cancellation during that process.

Who it's for

Choose AudioMass for browser-based editing, recording, looping, and modest multitrack production when avoiding installation and recurring fees matters. It is especially sensible for users who need offline continuity and saveable sessions. It is a weaker choice for mobile-first workflows, very large recordings, or collaboration that depends on shared cloud projects.

Pros and cons

• Pro: Broad waveform, effects, looping, and multitrack tools are included at no cost.
• Pro: Local browser execution enables offline work after loading and avoids a required backend.
• Pro: .amss sessions can be reopened, while WAV and MP3 exports cover common delivery needs.
• Con: Mobile optimization is limited, making touch-first editing less suitable.
• Con: Very large files may tie up browser resources during decoding with no progress or cancellation control.
• Con: No cloud collaboration is provided, so shared project workflows need another tool.

Alternatives

Audacity is the stronger alternative when you want a free, open-source desktop editor across Android, iOS, Linux, macOS, and Windows. Ocenaudio suits users seeking a free downloadable desktop editor for Linux, macOS, or Windows.

WavePad is worth choosing when you need a freemium editor across desktop and mobile, with paid annual editions adding capabilities such as full VST support. Pro Tools fits casual creators who prefer a free-forever introductory tier with stated track limits and a broader paid ecosystem.

Qtractor is a Linux-only, GPL-licensed alternative. WaveLab is for users who want a paid macOS or Windows product with a free trial and a free LE copy option. SADiE provides free Windows editions, including a license-free version intended for new computers. PhotoDirector is primarily a macOS and Windows photo application rather than a direct audio replacement.

For broader directories, see Audio Editing Software and Game Audio Editors.

Verdict

AudioMass is a strong pick for cost-conscious creators who want capable waveform, effects, looping, and multitrack tools in a browser with offline operation and reusable sessions. Its main reasons to look elsewhere are limited mobile ergonomics, resource-heavy decoding of very large files, and the absence of cloud collaboration.