Redacting audio

2022-03-14Last updated

You can apply masks to redact voices, noises, or other audio content in a video file.

Before you begin

Upload a file to a case.


  1. From a case, click the icon after the filename () in the Files field, and click Trim and Redact.
    Tip: You can also start a redaction from the File page or from the Evidence preview window when previewing evidence in a case.
    The Trim video window opens.
  2. (Optional) Move your cursor over the start or end of the file timeline and drag the its borders to fit your desired time range or adjust the From and To time values.
  3. Click New mask ().
    1. To change the duration of the audio mask, adjust the start and end points of the mask in the timeline.
      The audio timeline showing a section highlighted for redaction.
      Tip: To zoom in or out on the timeline, hold click and drag the timeline zoom slider.
  4. (Optional) Modify your masks if required.
    1. Click New mask () to create additional masks.
    2. Click delete () to remove any masks that you no longer require.
  5. Click Create video to save all masks that you have applied to a clip.
    1. (Optional) Click View details to track the progress.
      The Creating redacted video window showing redaction progress and the stages of the redaction have been completed.
    2. (Optional) Click Hide details to close the progress dialog.
The redacted video or audio clip is saved as a separate file.


Watch this video to learn more. Click the Captions icon (CC) to turn on video captions in one of the available languages.

After you finish

Before sharing the case with third parties or guests, restrict access to the original file by changing the access policy for the file.