Find loud or quiet tracks in your library
Scan individual tracks to identify outliers — songs that are dramatically louder or quieter than the rest of your playlist.
Loudness Reference / Playback Gain
Estimate the approximate loudness of any audio file and get a suggested playback gain adjustment. Uses simplified RMS analysis — results are a practical reference, not a certified EBU R128 measurement. All processing is local in your browser.
Key features
- Local processing
- No upload required
- Integrated loudness (LUFS)
- True peak (dBFS)
- Dynamic range
- ReplayGain suggestion
What is LUFS?
LUFS (Loudness Units relative to Full Scale) is a standard for measuring perceived loudness. Streaming platforms typically target -14 LUFS. Classical music is often mastered at -23 LUFS. Modern pop is often louder at -8 to -10 LUFS.
What is ReplayGain?
ReplayGain is a standard that stores a per-track gain adjustment so music players can normalize playback volume. The suggested value in this tool targets -14 LUFS. A positive value means the track is quieter than the target and should be turned up.
Note on accuracy
This tool uses a simplified RMS-based loudness measurement without full EBU R128 K-weighting. Results are a close approximation useful for comparison, but may differ slightly from dedicated loudness meters.
Common use cases
Get a ReplayGain adjustment value
Use the suggested gain to write a ReplayGain tag in your audio files, enabling volume normalization in OFPlayer, foobar2000, and other ReplayGain-aware players.
Check for clipping or over-loud masters
A true peak above -1 dBFS indicates potential clipping during playback. Use this to identify over-compressed or loudness-war victims.
Frequently asked questions
What loudness target should I use?
For general use, -14 LUFS is the target used by Spotify and YouTube. Classical and acoustic music is often best at -23 LUFS. Podcasts target -16 LUFS.
Is K-weighting applied?
No. This tool uses simplified RMS loudness without K-weighting for performance reasons. Results are close enough for comparison and ReplayGain estimation but are not certified EBU R128.
Is my audio uploaded?
No. All processing runs locally in your browser using the Web Audio API.
About this page
Loudness Reference / Playback Gain is part of OFPlayer's local-first music workflow. The page is designed to explain the feature, tool, or guide in plain language before you open the interactive app experience.
OFPlayer focuses on personal music collections, browser-based utility tools, WebDAV and Subsonic/Navidrome workflows, privacy-first playback, and lightweight library management. Files stay under your control, and the website avoids account-based lock-in.
Useful next pages from here include Audio Spectrum Viewer、Audio Format Converter、Audio Metadata Viewer、GitHub. These internal links help you continue from overview, to setup, to actual playback or tool usage without losing context.