Normalize audio levels online, free

Normalize audio in two steps

Drop your file and download; it’s normalized instantly, right in your browser.

When you’d want this

The simplest case is a recording that’s just too quiet, like a phone memo, a mic placed too far away, or a video with a whisper-level voiceover. Normalizing brings the whole file up to a standard, comfortable level in one pass, instead of you cranking system volume and hoping the loud parts don’t clip.

Interviews and multi-mic recordings have the opposite problem. Picture an interview where the interviewee sits back from the mic at a near-whisper while the interviewer is loud and close: the volume lurches between the two within the same file. Normalizing evens that out too, along with recordings from different devices or rooms that need to sound like they belong together once combined.

How it works

The tool measures the recording’s overall loudness and adjusts it to a widely used target for spoken-word audio, in a single pass, while capping the loudest peaks so they stay just under distortion. It’s a loudness adjustment, not noise reduction or a compressor: it changes how loud the file is, not how it was recorded.

Common pitfalls

Normalizing can’t rescue a recording that’s already distorted, clipped, or drowned in background noise. Those problems are baked into the audio, and normalizing only adjusts the overall level around them. If a recording is barely audible because of the room, not the volume setting, normalizing will make it louder, not clearer.

A single pass is fast, but approximate: it’s built for making everyday recordings sound consistent, not for broadcast-spec mastering.

Privacy

Everything runs locally in your browser using WebAssembly. If you want proof, open the browser’s network panel and watch while the tool works: not one request goes out carrying your audio, because there is no upload, server, or account behind it.

Transcribing it next?

Recordings with mismatched volume make it harder to tell speakers apart, so normalize first, then transcribe it for cleaner speaker separation. Transcription keeps the same privacy posture as this tool: your audio is deleted as soon as the transcript is saved. Your first 30 minutes are free.