Volume adjuster

Limits

• Output is 16-bit PCM WAV, which is large (roughly 10 times the size of an MP3). MP3 and AAC export are not available in the browser yet. Convert to MP3 or AAC with a desktop editor if you need small files.
• Which audio formats open depends on your browser: Chrome, Edge and Firefox read MP3, WAV, M4A/AAC, OGG, FLAC and WebM audio; Safari reads fewer (OGG/Opus and WebM support is limited, FLAC needs a recent version). A file the browser cannot decode gives an error naming it.
• Audio is decoded fully in memory, so files are limited to 200 MB and 30 minutes of audio (decoded stereo 44.1 kHz audio is about 20 MB per minute). On devices that report little memory, or on phones, the limit is lower and a clear message says so.
• The result keeps the file’s own sample rate when it can be read from a WAV, MP3, FLAC or Ogg header; for other formats the browser’s default rate (usually 44.1 or 48 kHz) is used.
• The RMS target is a simple average level over the whole file, not LUFS: there is no K-weighting or gating, so quiet passages and silences pull it down. Use it to bring clips to a similar level, not for broadcast compliance.
• The soft limiter is a static curve (it starts rounding peaks above 80% of full scale), not a look-ahead limiter; heavy boosts will sound distorted. Without it, samples past full scale are clipped hard and counted in the report.
• The report shows peak before and after in dBFS and how many samples were at full scale.
• Everything happens on this device; the file is never uploaded.

Ask the AI chat

The AI chat can run this tool for you. Try:

• “make this audio louder by 6 dB”
• “normalize my recording to -1 dB peak”
• “lower the volume of this clip”