> ## Documentation Index > Fetch the complete documentation index at: https://docs.usevelo.ai/llms.txt > Use this file to discover all available pages before exploring further. # Masks > Blur parts of the screen that shouldn't be shared. Masks blur a region of the recording so that passwords, personal email addresses, customer names or private dashboard figures are not legible to viewers. Blur is obscuring, not redaction — set it high enough that the content genuinely cannot be read, and check the result at full screen before you share. ## Adding a mask Open the **Insert** panel from the right sidebar and add a mask. A **Mask Region** appears on the canvas and a block is added to the **Masking** track. Drag the region over what you want hidden and resize it with the handles. ## Mask settings Selecting a mask opens the **Mask Editor** in the right-hand panel. Mask Editor with blur and roundness, and two mask blocks on the timeline | Control | What it does | | - | - | | **Blur** | How heavily the region is blurred. Higher values make the content less legible | | **Roundness** | Rounds the corners of the mask region | **Apply to all masks** pushes the current blur and roundness to every mask in the video at once, so a whole video can be made consistent in one step. Masks blur what is underneath — they do not paint over it with a solid block. Set **Blur** high enough that the content is genuinely unreadable, and check the result at full screen before sharing. ## Using several masks A video can carry as many masks as you need, each covering a different area at a different point in the video. They appear as separate blocks on the **Masking** track — in the screenshot above there are two, each at 40% blur — and you can drag their edges to control when each one is active. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.