Volume Booster by soniclab av SONICLAB

Volume Booster by SonicLab lets you make audio louder directly in your browser, with two convenient ways to boost sound.

Boost audio in your current tab: Increase the volume of compatible HTML5 audio and video from 100% up to 300%. It works with videos, music, podcasts, lectures, streams, and other supported web media. The extension uses the browser's Web Audio API with a limiter to provide real amplification while helping prevent excessive clipping.

Boost audio files: Select or drag and drop an audio file, preview the original and boosted versions, optionally normalize quiet recordings, and export the processed result as a WAV file.

Key features:
• 100%–300% amplification in 5% steps
• Quick presets: 100%, 125%, 150%, 200%, 250%, and 300%
• Per-site volume levels
• Automatic detection of dynamically added media
• Audio file preview and A/B comparison
• Optional audio normalization
• 16-bit PCM WAV export
• Processing happens locally on your device

No account is required, and the extension does not collect analytics or telemetry. Your audio files are processed locally and are not uploaded to a server.