# Customize a layer

Select any layer inside the email to open it in the Customize tab, where its controls depend on what the layer is. Sendra remembers every setting per layer, for each email frame in your file.

## Link

Any layer can carry a link. For a button, add the link on the button's frame, so the whole button is clickable. For an image, add it on the image.

**Link** takes any of these, and ships it exactly as typed:

- A web address: `https://example.com/offer`
- An email address: `mailto:hello@example.com`
- A phone number: `tel:+15551234567`
- A text message: `sms:+15551234567`
- A merge tag your email platform fills in: `{{ unsubscribe_url }}`. See [Personalization and merge tags](/personalization-and-merge-tags/).

A web address typed without its scheme, like `example.com`, gets `https://` added.

## Alt text

Images and vector artwork take alt text: what a screen reader says, and what shows when a client hides images. Leave it empty for a purely decorative shape.

## Show on

**Show on** decides where a layer appears: **Desktop + Mobile**, **Desktop only**, **Mobile only**, or **Hidden**. Use it to design a version of a section for each screen, or to leave a layer out of the email without deleting it from the design.

## Export as image

**Export as image** exports the layer as one picture, exactly as designed. Use it for overlapping layers or artwork that has to be reproduced precisely. Text inside becomes part of the picture.

## Format

Each image exports as **PNG** or **JPG**. An animated GIF keeps its animation when its format stays **GIF**; choosing PNG or JPG makes it a still image.

## Item type

For a frame, **Item type** tells Sendra whether it is a plain frame or a button. A button gets the button's mobile options, such as full width on phones.

## Start over

Properties has **Reset**, which clears every saved setting for the email: links, alt text, visibility, mobile overrides, preview text and canvas background. Your Figma design stays untouched.