Normalization changes a file’s peak or loudness without distorting the dynamics. “87” typically refers to -87 dB (very quiet) or more commonly 87 dB SPL (playback level) – but in digital audio, -23 LUFS is broadcast standard. If you specifically need 87 dB integrated loudness, you are likely working with film/post-production specs (sometimes -18 dBFS = 78 dB SPL, etc.).
For this guide: We’ll use free tools to normalize peak to -0.1 dB (safe maximum) or loudness to -23 LUFS. If you need an exact 87 dB playback SPL, that requires a calibrated sound card and SPL meter—not software alone. sound normalizer 87 full free
| Software | Type | Best for | Max file length? | |----------|------|----------|------------------| | Audacity | Editor | Precise peak/LUFS normalization | No limit | | MP3Gain | Batch tool | MP3s to 89 dB (close to 87) | Unlimited | | FFmpeg (command line) | Power user | Any audio/video format | No limit | | WavePad Free | Editor | Simple peak normalize | Some features limited | Normalization changes a file’s peak or loudness without
| Mistake | Consequence | |---------|--------------| | Normalizing to 0 dB peak | Causes clipping/inter-sample peaks | | Using “87” in MP3Gain without checking | MP3Gain’s unit is dB relative to full scale, not SPL | | Applying peak normalization to already loud tracks | No dynamic change, just raises noise floor | | Assuming all “free” normalizers are safe | Many “free” online tools inject noise or limit to 1 min | For this guide: We’ll use free tools to
