Download or save your HTML email signature file to your computer, then open it in your Chrome browser.
With the email signature open in your Chrome browser, press Ctrl + A (⌘ + A for Mac) to highlight the signature, then press Ctrl + C (⌘ + C for Mac) to copy the signature.
Important: Do not use your mouse to select the area, only use Ctrl + A (or ⌘ + A) as you may miss out on grabbing some of the code.
Login to your Zoho Mail account in your Chrome web browser. Once you're logged in, click the Settings icon at the top right of your screen.
From the left sidebar, scroll to the bottom and select Signature. Click the + icon in the next column to create a new email signature.
Enter a name for your email signature, then click inside the text field below and hit Ctrl + V (Cmd + V for Mac) to paste your copied email signature. Click Save or Update at the bottom of the window.
Compose a new email and you'll see your email signature now automatically inserts within Zoho from your Chrome browser.