Remove background noise from a recording EN

Fans, air conditioning and keyboard clatter, filtered after the fact - gentle, balanced or aggressive.

The background noise filter cleans up the audio of a recording you've already made. It reduces steady noise such as fans, air conditioning and keyboard clatter, and evens out the loudness of the whole recording. You choose how strong the filtering is, and you can change it or switch it off at any time.

Only the person who owns the recording can use the filter. It's available on the Free and Pro plans.

Choose a level

Level	What it does
Off	No filtering. The recording uses its original audio.
Low	Gentle noise reduction.
Medium	Balanced noise reduction. This is the recommended level.
High	Aggressive noise reduction, for noisy recordings.

Start with Medium. If noise is still noticeable, try High. If your voice sounds thin or processed, go back to Low. Stronger levels remove more noise, but they can also affect your voice.

Apply the filter

Open the recording's video page and click the Edit tab. You can also open the editor and click the Audio tab.
Click Background noise filter. In the editor, it's under the Background noise heading.
Pick a level, then click Apply.

A spinner shows while Rekorder processes the audio. When it finishes, the player reloads with the new audio and a small badge appears next to Background noise filter: LOW, MED or HIGH. Hover over the badge to see which level is applied. While the spinner is showing, you can't open the filter again.

The filter changes the recording itself, so anyone you've shared it with hears the cleaned-up audio too.

Change the level or go back to the original

Open Background noise filter again and pick a different level. To remove the filter, pick Off and click Apply. The badge disappears.

Rekorder saves your original audio before the first time it filters. Every change is made from that saved original, not from audio that has already been filtered. Switching levels or applying the filter several times therefore never makes the sound worse, and Off brings back the original.

Loudness

The filter also adjusts the volume of the whole recording to a consistent level. A recording can sound louder or quieter after you apply it. Off brings back the original volume.

If you edit the recording afterwards

When you edit the recording and render it with Apply & render, the applied level is reset to Off and the badge clears. Rekorder filters the edited audio from that point on, so open Background noise filter again if you want the filter on the edited recording. For how rendering works, see Save a draft vs Apply & render.

If you saved a copy of the recording to Google Drive, applying the filter makes that copy out of date. See When a Drive copy is out of date.

Troubleshooting

You see "Denoising failed". The message says something went wrong while processing the audio. Close it and try again. The badge keeps showing the level that was applied before, so your recording isn't changed.
The spinner stays for a long time. The filter runs in the background, and longer recordings take longer. Keep the page open. If it never finishes, contact support.
The noise is still there. Try High. The filter is designed for steady background sounds. Voices, music or sudden noises in the background may remain. To silence a section completely, see Silence a section without cutting the picture.