Background noise analyzer

Measure the background noise in a recording, free and private in your browser. Drop in a take to see the noise floor, an estimated signal to noise ratio, and whether there is mains hum, along with a plain reading of what kind of noise it is. Nothing is uploaded. Nothing is changed.

In your browser

Drop a recording here, or choose one

WAV, MP3, M4A or OGG. Analysed on your device, never uploaded.

Choose file

Runs in your browser. Nothing is uploaded. This is a free tool from Vocast.

How it works

1

Add your file

Drop or choose a recording. It stays on your device.

2

Profile

The quietest window is used as the noise profile.

3

Read

Read the noise floor, signal to noise ratio and hum check.

4

Clean

Fix the room if you can, or clean the file with the free noise remover.

Frequently asked

No. The analysis runs in your browser and the file never leaves your device.

Below -60 dB RMS is quiet enough for audiobook submission. Home rooms often sit between -45 dB and -55 dB.

A narrow tone at 50 Hz or 60 Hz picked up from power wiring or a poorly shielded cable. It shows up as a single spike in the profile.

No. This tool only diagnoses. The free noise remover cleans the file, and Vocast on Mac does deeper cleanup alongside voice cloning.

Related tools

Strip hiss, hum and room tone while your words stay clean. A/B the result and download.

Check an audiobook file against the ACX submission spec before you upload it.

Check your level against a safe zone, watch a live waveform, then hear a quick sample.

A quieter take, in your own voice

This is the free analyzer. To narrate and clean up long scripts in a voice cloned from your own, fully local and one time, get Vocast for $49.

Get Vocast for $49 See features