Audio Volume Changer — Adjust MP3 Loudness Online Free

Common use cases

• Normalizing podcast episodes for upload — A podcast producer exports a recorded interview at −22 LUFS. Most podcast apps target −14 to −16 LUFS; files below this level sound noticeably quieter than other shows in the player. Normalizing to Normal (−14 LUFS) before upload brings the episode to a consistent perceived loudness without altering the mix or the recording character.
• Boosting a too-quiet voice memo — A journalist recorded a field interview on a phone held at arm's length. The recording is technically clean but very quiet — the subject's voice sits at −30 dB relative to full scale. A +10 dB boost brings the speech to a comfortable listening level without introducing clipping on any of the peaks.
• Reducing volume on a music track for a video — A video editor needs a background music track at roughly half the original volume so dialogue recorded over it remains intelligible. A −6 dB adjustment reduces the track to 50% perceived loudness, giving the voiceover the headroom it needs without re-encoding in a DAW.
• Preparing audio for a social video clip — A content creator records a 60-second reel voiceover. Social platforms apply their own loudness normalization on upload, which can make clips sound inconsistent. Targeting Loud (−10 LUFS) before upload places the clip at a consistent level with other short-form content in the feed.
• Leveling a batch of interview clips to a consistent loudness — A documentary editor receives interview clips recorded by three different camera operators with different input gain settings. Each clip has a different average loudness. Normalizing all clips to Normal (−14 LUFS) before laying them into the timeline ensures a consistent listening level across the whole assembly without individual manual gain rides.