Online Audio Mastering
Drag and drop to bring your music to professional quality. Our proprietary algorithm analyzes your track and performs optimal mastering in seconds.
Easy Drag & Drop
Simply drag and drop your WAV or AIFF file to start mastering immediately.
Mastering in Seconds
Our proprietary algorithm quickly optimizes loudness, dynamics, and frequency balance.
All in Your Browser
No software installation required. Use it anytime, anywhere, right from your web browser.
How to Use
1. Upload Your Audio File
Drag and drop a WAV or AIFF file into the upload area, or click to browse. Both stereo and mono files are supported.
2. Select Processing Options
Enable or disable each processing stage to suit your track. For most music, keeping all options on delivers the best results.
3. Start Processing
Click "Start Process". All audio processing runs locally in your browser — no files are uploaded to any server. Processing typically completes in seconds.
4. Compare and Download
Use the A/B compare button to switch between the original and mastered versions. When you are satisfied with the result, download the mastered file.
Processing Options Explained
High-Pass Filter
Cuts all frequencies below the specified Hz cutoff. Removes low-frequency rumble and hum that reduces loudness headroom without contributing musical value. A cutoff of 80–120 Hz is recommended for most tracks.
Mid-Low Cut
Applies a subtle reduction in the 200–400 Hz range — often called the "mud" frequencies. This improves clarity and makes the mix feel more open and well-defined.
Glue Compression
A light bus compressor that unifies the stereo mix, making individual elements feel cohesive. It adds a sense of unity and polish without noticeably squashing dynamics.
Master for Release
Normalizes integrated loudness to –9 LUFS with a True Peak ceiling of –1.0 dB. This matches competitive streaming levels and prevents clipping during codec conversion on platforms like Spotify and Apple Music.
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What is Audio Mastering?
Audio mastering is the final step in music production before distribution. It is the process of optimizing a finished mix so it sounds consistent and professional across all listening environments — from studio monitors and headphones to car stereos and phone speakers.
Mastering also ensures that all tracks within an album or EP share a consistent volume and tonal balance. Streaming platforms such as Spotify and Apple Music apply loudness normalization, so proper mastering ensures your music is heard at its intended loudness and quality.
Traditionally, mastering required expensive studio time with specialist engineers. Fire Lit AI's browser-based mastering tool makes professional-grade processing accessible to everyone — no installation, no file uploads, completely free.